Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.molliq.2024.125966

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.intermet.2024.108378

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

The fabrication of Ti-Mg composite biomaterials was investigated using spark plasma sintering (SPS) with varying Mg contents and sintering pressures. The effects of powder mixing, Mg addition, and sintering pressure on the microstructure and mechanical properties of the composite materials were systematically analyzed. Uniform dispersion of Mg within the Ti matrix was achieved, confirming the efficacy of ethanol-assisted ball milling for consistent mixing. The Young’s modulus of the composite materials exhibited a linear decrease with increasing Mg content, with Ti-30vol%Mg and Ti-50vol%Mg demonstrating reduced modulus values compared to pure Ti. Based on density measurements, compression tests, and Young’s modulus results, it was determined that the sinterability of Ti-30vol%Mg saturates at a sintering pressure of approximately 50 MPa. Moreover, our immersion tests in physiological saline underscore the profound significance of our findings. Ti-30vol%Mg maintained compressive strength above that of cortical bone for 6-to-10 days, with mechanical integrity improving under higher sintering pressures. These findings mark a significant leap towards the development of Ti-Mg composite biomaterials with tailored mechanical properties, thereby enhancing biocompatibility and osseointegration for a wide range of biomedical applications.

DOI： 10.3390/ma17143470

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jallcom.2024.174556

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

Abstract

In this work, strengthening effects and evolution of precipitates in a pre-deformed Al–Zn–Mg–Cu alloy during ageing were investigated using Vickers hardness measurements, tensile tests, and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM). It was found that all cold rolled conditions had higher mechanical strength than the non-deformed condition for all ageing times and that this effect increases at higher deformation ratios. It was also found that the non-deformed condition has a higher age hardening response than that of the cold rolled conditions. A homogeneous precipitate distribution was observed in the non-deformed condition, while the cold rolled conditions contained non-uniformly distributed precipitates due to the introduced dislocations. This led to larger precipitate sizes and a reduction in the precipitate number densities in the pre-deformed conditions. HAADF-STEM analysis revealed differences in the fraction of different precipitate types between the non-deformed and the cold rolled conditions. η', η_2, and disordered η phase were observed in the non-deformed condition, while η', η₂ and the newly identified Y phase were observed in the cold rolled conditions. The disordered η phase contained structural units of the η₁ phase and was associated with reducing the lattice misfit between this phase and the Al matrix. Formation of the Y phase was related to an accelerated nucleation rate in the regions of high dislocation density.

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DOI： 10.1007/s12540-024-01718-5

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Other Link： https://link.springer.com/article/10.1007/s12540-024-01718-5/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

Abstract

Optimization of user-defined parameters (Dmax, Nmin, order (K)) in the Density-based Spatial Clustering of Applications with Noise (DBSCAN) algorithm, used to characterize nanoclusters in Al–0.9% Mg–1.0% Si–0.3% Cu (mass %), was conducted. Ten combinations of parameters with a given K were considered for samples naturally aged (NA) and preaged (PA) at 100°C. We confirmed four types of unphysical clusters, artificially formed, by analyzing composition with size, atomic density, and atomic arrangement inside clusters. The optimum combinations minimizing those unphysical clusters were obtained for both NA and PA samples. Meanwhile, to evaluate the reliability of the optimum combination, volume rendering and isosurfacing were performed. As a result, regions of high solute concentration were confirmed, and those regions are in good agreement with the position of the clusters obtained by applying the optimum combination in DBSCAN. Furthermore, by comparing the optimum combinations with the fixed parameters widely used until now, we showed that for each dataset, considering independent parameters obtained in the same method is desirable rather than using fixed parameters. Consequently, an idea of determining the algorithm parameters for characterizing the nanoclusters in Al–Mg–Si(–Cu) alloys was introduced.

DOI： 10.1093/mam/ozae053

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jmrt.2024.06.048

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.rinma.2024.100553

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Light Metals  

DOI： 10.2464/jilm.73.592

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.4028/p-x1RGc0

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.intermet.2023.108069

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.intermet.2023.107986

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jmrt.2023.09.159

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.mt-mf2022032

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jallcom.2023.169291

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Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

Abstract

Calcium phosphate (Ca-P) surface coating is a simple but effective way to enhance both corrosion resistance and biocompatibility of ZK60 magnesium alloy. However, cell compatibility on different Ca-P layers coated on ZK60 alloy has seldom been investigated. In this study, the effects of type, morphology and corrosion protection of several Ca-P coatings formed at pH 6.5, 7.8 and 10.2 on cell behavior were examined by using an osteoblastic cell line MC3T3-E1. Furthermore, in vivo behavior in rabbits of the alloy coated with the optimum Ca-P layer was also studied. It was found that the surface factors governed the cell morphology and density. The coating morphology plays a dominant role in these surface factors. The sample coated at pH 7.8 showed the best cellular biocompatibility, suggesting that the hydroxyapatite (HAp) layer formed at pH 7.8 was the optimum coating. In rabbits, this optimum coating enhanced remarkably the corrosion resistance of the alloy. During implantation, the outermost crystals of the HAp coating were shortened and thinned due to the dissolution of HAp caused by the body fluid of the rabbits. It is indicated that ZK60 alloy coated at pH 7.8 can be applied as a biodegradable implant.

DOI： 10.1088/1748-605x/acbf16

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Other Link： https://iopscience.iop.org/article/10.1088/1748-605X/acbf16/pdf

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.compositesa.2022.107161

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jallcom.2022.165070

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.surfcoat.2022.128639

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.mt-m2021162

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.matlet.2021.131337

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.molliq.2021.118063

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s12613-021-2339-6

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Other Link： https://link.springer.com/article/10.1007/s12613-021-2339-6/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.matpr.2022.06.497

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Light Metals  

DOI： 10.2464/jilm.71.562

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Aging heat treatment is the most commonly used strengthening method for Al–Mg–Si alloys since high-density precipitates will be formed to hinder the movement of dislocations. In the current work, room temperature cyclic deformation was attempted to strengthen the alloy. We compared tensile test results of aged samples and cyclically deformed samples. It was found that cyclically deformed samples can achieve similar strength and approximately twice the uniform elongation as the peak aged samples. The high density of dislocations and nanoclusters observed in the cyclically deformed samples is thought to be the main reason for strengthening. Different cyclic deformation conditions have been tried and their effects were discussed.

DOI： 10.3390/met11111735

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2021.141667

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.surfcoat.2021.127414

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Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acsabm.1c00594

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2021.141557

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.compositesb.2021.108678

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.matchar.2020.110863

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

For applications of biodegradable load-bearing implants, we incorporated 10 or 20 vol% β-tricalcium phosphate (β-TCP) into Mg-based composites through reaction sintering in the spark plasma sintering process. We previously reported that the evolved microstructure enhanced mechanical properties before degradation and modified in vitro degradation behaviors. In this study, immersion tests in physiological saline and subsequent compression tests in the air were conducted to investigate the effects of degradation on mechanical integrity. In the immersion tests, Mg/β-TCP composites showed no visible disintegration of sintered particles due to interfacial strength enhanced by reaction sintering. Local corrosion was observed in the Mg matrix adjacent to the reaction products. In addition, Mg/10% β-TCP showed dense degradation products of Mg(OH)2 compared with Mg and Mg/20% β-TCP. Those degradation behaviors resulted in reducing the effective load transfer from the Mg matrix to the reaction products as reinforcement. The yield strength decreased by 18.1% for Mg/10% β-TCP and 70.9% for Mg/20% β-TCP after six days of immersion. These results can give a broad view of designing spark plasma sintered Mg/bioceramic composites with the consideration of mechanical integrity.

DOI： 10.3390/met11020227

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Publishing type：Research paper (scientific journal)   Publisher：Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  

<p lang="en">First-principles calculation and experimental methods are used to study the interfacial properties and reaction of diamond/Al composites. Based on the first-principles method, the interfacial adhesion work (&lt;i&gt;W&lt;/i&gt;&lt;sub&gt;ad&lt;/sub&gt;), electronic structure and charge transfer of diamond/Al models are calculated systematically. The results show that the adhesion work of diamond(100)/Al(111) is 41% higher than that of diamond(111)/Al(111), therefore, the interface bonding of diamond(100)/Al(111) interface is stronger. According to the analysis of the electronic structure, there are more charges transferring at the diamond(100)/Al(111) interface, and the high charge density is distributed on the side of C atoms. The redistribution of charges at the interface is conducive to the formation of Al—C bond, so that the tendency of forming Al—C bonds is greater. The introduction of Al—C bond can promote the formation of C—C bond at the diamond(100)/Al(111) interface and improve the interfacial adhesion work. In addition, the diamond/Al composites are fabricated by vacuum gas pressure infiltration, and multi-scale characterization of the interface structure of diamond/Al composites is carried out. The interfacial debonding occurs mainly on the diamond {111}. Meanwhile, the interface product Al&lt;sub&gt;4&lt;/sub&gt;C&lt;sub&gt;3&lt;/sub&gt; is easier to form on the diamond {100}. The experimental phenomenon is consistent with the calculated results. Moreover, the influence of the interfacial reaction on the properties and stability of diamond/Al composites are further discussed through heat-moisture treatment. The study finds that the performance degradation in heat-moisture environment is related mainly to the hydrolysis of the interface product Al&lt;sub&gt;4&lt;/sub&gt;C&lt;sub&gt;3&lt;/sub&gt;. After 60 days’ heat-moisture, the thermal conductivity of the diamond/Al composites decreases by 29.9%, and the bending strength is reduced by 40.1%. The large attenuation of performance is not conducive to the stability of composites in complex environments. Therefore, inhibiting the formation of Al&lt;sub&gt;4&lt;/sub&gt;C&lt;sub&gt;3&lt;/sub&gt; and improving interfacial selectivity are of great importance in developing the performance and stability of diamond/Al composites. The research in this paper not only lays a theoretical foundation for the first-principles calculation of the interface properties of diamond/metal, but also possesses important guidance significance in designing the diamond/metal composites.</p>

DOI： 10.7498/aps.70.20210341

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

The aim of this study is to investigate a characteristic deformation behavior of a precipitation strengthening-type Cu-Ni-Si alloy (Cu-2.4Ni-0.51Si-9.3Zn-0.15Sn-0.13Mg) by microcompression specimens. Three micropillars with a square cross-section of 20 × 20 × 40 μm3 were fabricated by focused ion beam (FIB) micromachining apparatus and tested by a machine specially designed for microsized specimens. The three pillars were deformed complicatedly and showed different yield strengths depending on the crystal orientation. The micromechanical tests revealed work hardening by the precipitation clearly. Electron backscattered diffraction analysis of a deformed specimen showed a gradual rotation of grain axis at the grain boundaries after the compression test.

DOI： 10.3390/cryst10121162

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Publishing type：Research paper (scientific journal)   Publisher：Association for Materials Protection and Performance (AMPP)  

The influences of Zn content and heat treatment on microstructure and corrosion behavior of Mg-xZn (x = 1 wt%, 3 wt%, 5 wt%, and 7 wt%) alloys were studied. (α-Mg+MgZn) eutectic cells and Zn-segregated regions were formed in the as-cast alloys. The Zn-rich phases acted as microcathodes in galvanic corrosion. Volume fraction of the Zn-rich phases increased with Zn content of the as-cast alloys, leading to a decrease in corrosion resistance. The corrosion rate of the as-cast alloys increased four times with an increase of the volume fraction of eutectic cell from 0.07 vol% of Mg-1Zn alloy to 2.18 vol% of Mg-5Zn alloy. The corrosion rate of Mg-7Zn alloy with 2.87 vol% eutectic cells was two times higher than that of Mg-5Zn alloy. The Zn-rich phases dissolved by the T4 treatment and only the T4-treated Mg-7Zn alloy obviously showed eutectic cells of 1.73 vol%. The polarization resistance (Rp) of the T4-treated Mg-1, 3, and 5Zn alloys was 2 to 10 times higher than that of the as-cast alloys. The T4-treated Mg-7Zn showed similar Rp to the as-cast Mg-5Zn alloy. Consequently, the volume fraction of Zn-rich phases dominated the corrosion resistance of Mg-xZn alloys.

DOI： 10.5006/3672

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2019.138449

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

In this study, hydroxyapatite (HAp) coated Mg matrix composites were fabricated for biodegradable implant applications. Spark plasma sintering was employed to fabricate the Mg-10 wt% ZnO composite substrates. HAp was coated on the surface of the sintered composites and pure Mg by a chemical solution treatment. SEM and optical micrographs of coated samples showed that HAp grew homogeneously and formed a layer on the entire surface of both pure sintered Mg and Mg composites. The immersion and polarization test results demonstrated that the HAp coating significantly improved the corrosion resistance of the sintered composites. While the HAp coating layer is not effective in the improvement of the pure Mg substrate, cell culture test results revealed that the HAp coating improved cell adhesion and proliferation on the composites effectively through 72 h, while no cell could survive on the uncoated composites after 72 h. In addition, the corrosion tests and cell culture test results indicated that the composite with longer sintering time has better corrosion resistance and cell viability than those of the composite with shorter sintering time. The findings suggested that the HAp-coated Mg-10 wt% ZnO-2.5 h + 10 min composite is a high-potential candidate for biodegradable implant applications.

DOI： 10.3390/ma12213474

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Publishing type：Research paper (scientific journal)   Publisher：Wiley  

Abstract

Magnesium (Mg)‐based materials have shown great potentials for bioresorbable implant applications. Previous studies showed that Mg with 10 and 20 vol % β‐tricalcium phosphate (β‐TCP) composites produced by spark plasma sintering, improved mechanical properties when compared with pure Mg. The objectives of this study were to evaluate the degradation behaviors of Mg/10% β‐TCP and Mg/20% β‐TCP composites in revised stimulated body fluid (rSBF), and to determine their cytocompatibility with bone marrow derived mesenchymal stem cells (BMSCs) using the direct culture method. During the 11 days of immersion in rSBF, Mg/β‐TCP composites showed different degradation behaviors at different immersion periods, that is, the initial stage (0–1 hr), the mid‐term stage (1 hr to 2 days), and the long‐term stage (2−11 days). The counter effects of mass loss due to microgalvanic corrosion and mass gain due to deposition of Ca‐P containing layers resulted in slower Mg²⁺ ion release for Mg/20% β‐TCP than Mg/10% β‐TCP in the mid‐term, but eventually 16% mass loss for Mg/20% β‐TCP and 10% mass loss for Mg/10% β‐TCP after 11 days of immersion. The in vitro studies with BMSCs showed the highest cell adhesion density (i.e., 68% of seeding density) on the plate surrounding the Mg/10% β‐TCP sample, that is, under the indirect contact condition of direct culture. The β‐TCP showed a positive effect on direct adhesion of BMSCs on the surface of Mg/β‐TCP composites. This study elucidated the degradation behaviors and the cytocompatibility of Mg/β‐TCP composites in vitro; and, further studies on Mg/ceramic composites are needed to determine their potential for clinical applications. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 2238–2253, 2019.

DOI： 10.1002/jbm.b.34316

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jbm.b.34316

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2018.01.086

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.matchar.2017.12.006

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Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Mg matrix in situ composites were fabricated from Mg and ZnO powder by a spark plasma sintering method. The composition and microstructure of the sintered samples were characterized. Corrosion properties of fabricated composites were evaluated by immersion and by electrochemical tests using Hanks’ solution. The results showed that the formation of in situ products improved significantly the corrosion resistance of the fabricated composites compared with pure Mg; Mg-10 wt % ZnO composites especially exhibited the lowest corrosion rate. In addition, an energy-dispersive X-ray (EDX) analysis showed that calcium phosphate formed as a corrosion product on the surface of Mg-10 wt % ZnO composites, while Mg(OH)2 appeared as a corrosion product on the surface of Mg-20 wt % ZnO composite. The findings suggested Mg-10 wt % ZnO composite as a potential candidate for temporary implant application.

DOI： 10.3390/met7090358

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Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>“Sensitized thermal cells” do not rely on the Seebeck effect and do not require a temperature difference.</p>

DOI： 10.1039/c7mh00108h

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Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

DOI： 10.1080/00325899.2016.1219087

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2016.01.087

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1166/jnn.2016.11955

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.M2016188

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-m2016827

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.L-M2015824

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：Faculty of Engineering, Chulalongkorn University  

DOI： 10.4186/ej.2015.19.3.75

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Light Metals  

DOI： 10.2464/jilm.65.617

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-m2015801

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.m2015118

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.L-M2014827

Web of Science

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Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

The characteristic age-hardening response of Al-3.0Mg-1.0Cu (mass%) alloys with and without Ag addition has been investigated by the hardness measurement, differential scanning calorimetry (DSC) and electrical resistivity measurement. The alloy compositions locating in the (α+S+T) phase field of the Al-Mg-Cu phase diagram are known to be effective to harden in two stages separated by a distinct and often prolonged hardness plateau. The first stage of hardening occurs very rapidly (e.g. within 60 s at 443 K) and contributes to increase hardness as much as 50 % of the total age-hardening. In the Ag-added alloy, the hardness change during the first stage of hardening is larger and the plateau stage is shortened as a result of the fast arrival at the second stage of hardness. Small amount of Ag changes the age hardening response of the Base alloy dramatically. In the low temperature aging, the incubation stage at which no clear hardness and electrical resistivity increase appears for a long period before the first stage of hardening. After the pre-aging at this incubation period, a characteristic two-step aging response is observed. The peak hardness dramatically changes in the Al-3.0Mg-1.0Cu alloy, while no clear change in the Ag-added alloy.

DOI： 10.4028/www.scientific.net/msf.794-796.996

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Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

Quench sensitivity in two Al-Mg-Si alloys, one Cu-free and the other with low Cu additions (~0.1 wt%), both having the same amounts of other solutes, has been investigated using transmission electron microscopy (TEM) and corresponding material hardness. A two stage hardness evolution during an isothermal heat treatment was observed with slow cooling after solution heat treatment. This effect was less pronounced in the Cu-added alloy. However maximum hardness was not influenced by cooling rate, which could be related to higher precipitate number densities and volume fractions. Both alloys were over-aged faster in the slow cooling conditions.

DOI： 10.4028/www.scientific.net/amr.922.616

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Publishing type：Research paper (scientific journal)   Publisher：The Materials Research Society of Korea  

DOI： 10.3740/mrsk.2014.24.5.229

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.M2013411

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2013.12.048

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.L-M2014832

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Publishing type：Research paper (international conference proceedings)   Publisher：Trans Tech Publications, Ltd.  

DOI： 10.4028/www.scientific.net/MSF.794-796.1109

Scopus

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.mbw201326

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-m2014829

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.F-M2013808

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Applied Physics  

Because of its excellent biocompatibility, good corrosion resistance and relatively lower Young's modulus, Ti was suitable for biomaterial. It, however, showed still bigger Young's modulus comparing to the living bone. It was necessary to decrease the Young's modulus in order to avoid adversely affect to the bone, such as stress sheilding. In this study, porous Ti were fablicated to decrease the Young's modulus by space holder method from Ti/NaCl composites sintered using spark plasma sintering (SPS) method. The sintering condition and the size of NaCl affected to the porous structure and mechanical properties. According to the scanning electron microscope (SEM) observation and the relative density measurement of specimens sintered with several sintering conditions, the desirable sintering condition was concluded as 973 K of sintering temperature and 1.2 ks of sintering time. The specimens made from NaCl powder whose size were from 106 to 214 μm showed almost opened and connected pores. The Young's modulus was decreased with increasing the porosity.

DOI： 10.7567/JJAP.52.01AE03

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Other Link： https://iopscience.iop.org/article/10.7567/JJAP.52.01AE03/pdf

Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2012.09.051

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.mbw201208

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.mc201204

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.m2012339

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.maw201315

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Publishing type：Research paper (scientific journal)   Publisher：The Materials Research Society of Korea  

DOI： 10.3740/mrsk.2012.22.7.329

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Publishing type：Research paper (scientific journal)   Publisher：The Materials Research Society of Korea  

DOI： 10.3740/mrsk.2012.22.3.111

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-319-48761-8_158

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1002/9781118495292.ch220

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Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-319-48761-8_277

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-m2011847

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-m2012819

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Publishing type：Part of collection (book)   Publisher：Springer International Publishing  

DOI： 10.1007/978-3-319-48761-8_166

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.l-mz201121

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Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

This study aims at producing porous Ti filled with biodegradable materials for biomedical implants by means of spark plasma sintering method (SPS). To improve bone fixation and to obtain appropriate Young’s modulus as a medical implant material, we applied -tri calcium phosphate (-TCP) to the Ti-based composite. Ti/-TCP powder mixtures were sintered by SPS under applied stress of 45MPa with various temperatures and holding time. Vickers hardness (Hv) of obtained composite increased with increasing the holding time up to 10 min, and saturated hardness was approximately 750 Hv, which is extremely higher than that of bulk Ti. Hardness also increased as sintering temperature increased up to 1473 K. From the results of microstructure observations by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDXS), O- and P- containing Ti surrounded around Ti particle, and O diffused into Ti particle to a certain extent. X-ray diffraction results indicated several kinds of Ti-O and/or Ti-P formed in the specimen. Results indicated that it is the brittle phases formed during sintering that increased the hardness.

DOI： 10.4028/www.scientific.net/msf.654-656.2158

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.m2010092

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.msea.2009.06.054

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Publishing type：Research paper (scientific journal)   Publisher：Wiley  

Abstract

Real‐time, in situ electrochemical quartz crystal microbalance (EQCM) measurements are conducted to better understand the electrocrystallization of calcium phosphates (CaP) on CP‐Ti. X‐ray photoelectron spectroscopy is used to identify the exact phase deposited, so that reliable estimation of the electrochemical processes involved is made. Analysis of the integrated intensity of the oxygen shake‐up peaks, in combination with the determination of Ca/P and O/Ca atomic ratios, enables to determine unambiguously that the octacalcium phosphate (OCP) is formed. Its role as a precursor to hydroxyapatite (HAp) is discussed. After an incubation period, the process by which OCP is formed follows a Faradaic behavior. The incubation time may be related to the need for local increase of pH before precipitation from solution can occur. The standard enthalpy of activation is ∼40 kJ/mol, which excludes diffusion‐controlled processes from being rate determining. The OCP deposit has thickness ≈0.61 μm, apparent density ≈ 0.95 g/cm³, 63.6% porosity, and deposition rate of 23.5 ng/(cm² s) or 15 nm/min. The low‐equivalent weight value of 20.5 g/equiv, and the associated remarkably high number of electrons transferred in the reaction n ≈ 24, indicates that most of the current is consumed either by electrolysis of water or by a complex set of parasitic reactions. The low‐solubility product allows precipitation of CaP even at relatively low concentrations of calcium and phosphate/hydrogen phosphate ions. It is shown that HAp most likely forms via transformation of precursor phases, such as OCP, rather than directly. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009

DOI： 10.1002/jbm.a.32129

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.dental.2007.10.002

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Publishing type：Research paper (scientific journal)   Publisher：Wiley  

Abstract

The objective of this study was to investigate the structure and strength at the bonding interface of a titanium (Ti)‐segmented polyurethane (SPU) composite through (3‐trimethoxysilyl) propyl methacrylate (γ‐MPS) for artificial organs. The effects of the thickness of the γ‐MPS layer on the shear bonding strength between Ti and SPU were investigated. Ti disks were immersed in various concentrations of γ‐MPS solutions for several immersion times. The depth profiles of elements and the thickness of the γ‐MPS layer were determined by glow discharge optical emission spectroscopy and ellipsometry, respectively. The bonding stress at the Ti/γ‐MPS/SPU interface was evaluated with a shear bonding test. Furthermore, the fractured surface of a Ti‐SPU composite was observed by optical microscopy and characterized using X‐ray photoelectron spectroscopy. Consequently, the thickness of the γ‐MPS layer was controlled by the concentration of the γ‐MPS solution and immersion time. The shear bonding stress at the interface increased with the increase of the thickness of the γ‐MPS layer. Therefore, the control of the thickness of the γ‐MPS layer is significant to increase the shear bonding stress at the Ti/γ‐MPS/SPU interface. These results are significant to create composites for artificial organs consisting of other metals and polymers. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2007

DOI： 10.1002/jbm.a.30957

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Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

For commercialized dental implants, to enhance the bone bonding of the artificial toothroots, several kinds of surface modification techniques, such as hydroxy-apatite coating, anodicoxidation and sand-blasting, have been developed. Apart from the surface modification, it is knownthat the bone growth is accelerated by electric stimulations in the living body. In the present study, thegalvanic current between titanium substrate and gold coating partially on the titanium implants wasapplied to enhance calcium phosphate precipitation in a pseudo-body fluid namely Hanks’ solution.The galvanic current between titanium specimens and gold electrode jumped up approximately 0.2 safter put into Hanks’ solution and the current has decreased asymptotically. With such consideration,the desirable conditions of surface modification by gold coating were presented to provide suitablegalvanic current density enhancing calcium phosphate precipitation.

DOI： 10.4028/www.scientific.net/msf.539-543.653

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.48.301

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.48.428

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Publishing type：Research paper (scientific journal)  

DOI： 10.2320/jinstmet.71.395

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.48.287

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s10856-006-0004-2

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Other Link： https://link.springer.com/article/10.1007/s10856-006-0004-2/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：Trans Tech Publications, Ltd.  

DOI： 10.4028/www.scientific.net/amr.15-17.125

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.47.2444

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.47.1826

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Publishing type：Research paper (scientific journal)   Publisher：Japanese Society for Dental Materials and Devices  

DOI： 10.4012/dmj.24.541

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.46.1555

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.46.2260

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.46.1551

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Publishing type：Research paper (scientific journal)   Publisher：Japanese Society for Dental Materials and Devices  

DOI： 10.4012/dmj.23.497

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.43.3065

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1023/a:1008991405784

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Other Link： https://link.springer.com/article/10.1023/A:1008991405784/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：Walter de Gruyter GmbH  

DOI： 10.1163/15685570052061955

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/jinstmet1952.57.5_574

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Language：Japanese   Publisher：The Japan Institute of Metals and Materials  

DOI： 10.2320/materia.41.553

CiNii Books

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Other Link： https://jlc.jst.go.jp/DN/JALC/00154260794?from=CiNii

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Language：English  

Web of Science

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Language：English  

Web of Science

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Language：Japanese  

DOI： 10.2320/jinstmet1952.64.11_1120

Web of Science

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Language：Japanese   Publisher：Japan Inst of Metals  

DOI： 10.2320/jinstmet1952.64.11_1120

Scopus

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Language：English   Publisher：Tokyo Medical and Dental University  

DOI： 10.11480/jmds.460103

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PubMed

CiNii Books

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Language：English  

DOI： 10.1023/A:1008927407556

Web of Science

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Other Link： https://link.springer.com/article/10.1023/A:1008927407556/fulltext.html

Language：English  

DOI： 10.1023/A:1008909408948

Web of Science

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Other Link： https://link.springer.com/article/10.1023/A:1008909408948/fulltext.html

Language：English  

DOI： 10.1089/ten.1998.4.197

Scopus

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Language：English  

DOI： 10.1002/jbm.820290805

Web of Science

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DOI： 10.18939/jjdm.14.3_321

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DOI： 10.18939/jjdm.14.4_406

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Language：Japanese   Publisher：The Japanese Society for Dental Materials and Devices (JSDMD)  

Mechanical properties of titanium-zirconium binary alloys were investigated in order to reveal their possibility for new biomedical materials.Useful data for alloy designing are collected through a tensile test and an optical microscopy.The strength of the alloys containing 25 to 75 atomic per cent zirconium is approximately three times as large as the strength of pure titanium and pure zirconium.These results consist wtih the results of other investifators and hardness test reported previously.Large elongation are obtained regardless of strengthening by a solid solution hardening and/or a precipitate hardening in the alloys having 25 to 75 atomic per cent zirconium content.From these reults, it is concluded that new alloys for biomedical materials should be designed as a titanium-zirconium base alloys.

DOI： 10.18939/jjdm.14.3_321

CiNii Books

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DOI： 10.18939/jjdm.14.4_406

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Language：English  

DOI： 10.2464/jilm.44.595

Scopus

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Language：English  

DOI： 10.2464/jilm.44.595

Scopus

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Language：English  

DOI： 10.1080/02619180.1990.11753477

Web of Science

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

DOI： 10.2320/jinstmet1952.53.2_251

Web of Science

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DOI： 10.2320/jinstmet1952.53.2_251

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