Organization
School of Materials and Chemical Technology Professor
Title
Professor
External link
MURAISHI SHINJI
Degree
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Doctor of Engineering ( Tokyo Institute of Technology )
Research Interests
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金属組織
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Science of metals and alloys
Research Areas
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Nanotechnology/Materials / Structural materials and functional materials
Education
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Tokyo Institute of Technology Graduate School, Division of Integrated Science and Engineering
- 2002
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Tokyo Institute of Technology Interdisciplinary Science and Engineering Materials Science and Engineering
- 2002
Country： Japan
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Tokyo Institute of Technology School of Engineering Dept. of Metallurgical Engineering
- 1997
Country： Japan
Research History
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-:Tokyou Metropolitan College of Technology PART-TIME LECTURER
2006
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-:東京都立工業高等専門学校 非常勤講師
2006
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:東京大学 先端科学技術研究センター 特任助手
2002 - 2004
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:The University of Tokyo Research Center for Advanced Science and Technology Research Associate
2002 - 2004
Professional Memberships
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日本金属学会
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軽金属学会
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日本鉄鋼協会
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Japan Institute of Metals
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Japan Institute of Light Metals
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The Iron and Steel Institute of Japan
Papers
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Optimal Arrangements and Local Anisotropy of {100} Guinier–Preston (GP) Zones by Parametric Dislocation Dynamics (PDD) Simulations
2024.10
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Interaction between dislocation and heterogeneous interface in Cu/Fe laminated composites based on discrete dislocation dynamics ,
2024.7
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Experimental and numerical analyses of cooling and intermediate layer formation process at the magnetic pulse Welded Al/Fe joint interface
Jiedi Li, Shinji Muraishi, Shinji Kumai
Materials Transactions 62 ( 9 ) 1376 - 1385 2021.9
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Magnetic pulse forming behavior and the high speed deformation structure of A1050 aluminum sheet
Takashi Kambe, Shinji Muraishi, Shinji Kumai
Keikinzoku/Journal of Japan Institute of Light Metals 71 ( 1 ) 51 - 59 2021.1
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Experimental and numerical analyses of wavy interface formation and local melting phenomena at the magnetic pulse welded al/fe joint interface
Jiedi Li, Shinji Muraishi, Shinji Kumai
Materials Transactions 62 ( 8 ) 1184 - 1193 2021
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Experimental and numerical analyses of magnetic pulse forming of A1050 aluminum sheet
Takashi Kambe, Yasutaka Kedo, Shinji Muraishi, Shinji Kumai
Materials Transactions 61 ( 2 ) 346 - 354 2020
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Effect of cooling rate on constituent particle formation in high-speed twin-roll cast Al-Mn based alloy strips
Ram Song, Shinji Muraishi, Shinji Kumai
73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings 35 - 36 2018
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Numerical analysis of wavy interface formation and successive temperature change in magnetic pulse welded Al/Cu joint
Junto Nishiwaki, Takashi Kambe, Yasutaka Kedo, Yohei Harada, Shinji Muraishi, Shinji Kumai
Materials Science Forum 877 655 - 661 2017
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Microstructural evolution of Al-Mn based alloy fabricated by vertical-type high-speed twin-roll casting
Ram Song, Yohei Harada, Shinji Muraishi, Shinji Kumai
Materials Science Forum 877 51 - 55 2017
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67 ( 9 ) 447 - 459 2017
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タンデム式縦型高速双ロールキャスト法により作製したAl-Mn/Al-Si合金クラッド材の界面接合に及ぼす芯材表面状態の影響
高山 雄介, 原田 陽平, 村石 信二, 熊井 真次
鋳造工学 全国講演大会講演概要集 169 108 - 108 2017
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Experimental and numerical analysis of the formation behavior of intermediate layers at explosive welded Al/Fe joint interfaces Reviewed
Yusuke Aizawa, Junto Nishiwaki, Yohei Harada, Shinji Muraishi, Shinji Kumai
JOURNAL OF MANUFACTURING PROCESSES 24 100 - 106 2016.10
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The Effects of Low Cu Additions and Predeformation on the Precipitation in a 6060 Al-Mg-Si Alloy Reviewed
Takeshi Saito, Shinji Muraishi, Calin D. Marioara, Sigmund J. Andersen, Jostein Royset, Randi Holmestad
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 44A ( 9 ) 4124 - 4135 2013.9
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Phase separation into nano-crystalline nitrides in ternary Ti-Si-N system via N implantation Reviewed
S Muraishi, T Aizawa
PRICM 5: THE FIFTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-5 475-479 3651 - 3654 2005
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Surface nano-structuring of Zr thin film via Ni-implantation Reviewed
S Muraishi, T Aizawa
METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS 24-25 65 - 68 2005
MISC
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Interface Bonding Conditions in A3003/A4045 Clad Strip Fabricated by Vertical-Type High-Speed Tandem Twin-Roll Casting
高山雄介, 原田陽平, 村石信二, 熊井真次
鋳造工学 91 ( 7 ) 2019
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Microstructure and Brazing Characteristics of Brazing Sheets Fabricated by Vertical-type Tandem Twin-roll Casting
高山雄介, 山野花穗, 成田渉, 中村亮司, 筒井あかり, 原田陽平, 村石信二, 熊井真次
鋳造工学 88 ( 10 ) 2016
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Mixture rule for indentation derived Young's modulus in layered composites
Shinji Muraishi
Thin Solid Films 518 ( 1 ) 233 - 246 2009.11
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Mixture rule for indentation derived Young's modulus in layered composites
Shinji Muraishi
THIN SOLID FILMS 518 ( 1 ) 233 - 246 2009.11
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Microstructure and elasticity of glassy alloy surface by reactive and inert ion implantation
Shinji Muraishi, Hirono Naito, Tatuhiko Aizawa
MATERIALS TRANSACTIONS 48 ( 7 ) 1859 - 1863 2007.7
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Ellipsometric characterization on multi-layered thin film systems during hydrogenation
D. J. Santjojo, Tatsuhiko Aizawa, S. Muraishi
MATERIALS TRANSACTIONS 48 ( 6 ) 1380 - 1386 2007.6
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Ellipsometric characterization on multi-layered thin film systems during hydrogenation
D. J. Santjojo, Tatsuhiko Aizawa, S. Muraishi
MATERIALS TRANSACTIONS 48 ( 6 ) 1380 - 1386 2007.6
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Compositional dependent amorphization in Zr alloy films by means of Ni-implantation
S Muraishi, H Naito, T Aizawa
MATERIALS TRANSACTIONS 46 ( 12 ) 2751 - 2754 2005.12
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Compositional dependent amorphization in Zr alloy films by means of Ni-implantation
S Muraishi, H Naito, T Aizawa
MATERIALS TRANSACTIONS 46 ( 12 ) 2751 - 2754 2005.12
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Self-lubrication mechanism via the in situ formed lubricious oxide tribofilm
T Aizawa, A Mitsuo, S Yamamoto, T Sumitomo, S Muraishi
WEAR 259 ( 1-6 ) 708 - 718 2005.7
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Fabrication of glassy surface via ion-irradiation: Ni-irradiation induced c-a transition behavior in Zr alloys
S. Muraishi, H. Naito, T. Aizawa
Materials Science of Bulk Metallic Glasses ( 6 ) 4 2005
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イオン照射によるＺｒ基合金の非晶質化
村石信二, 相澤龍彦
「金属ガラスの最適構造化プロセス」研究会講演概要 2 36 2005
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Fabrication of glassy surface via ion-irradiation: Ni-irradiation induced c-a transition behavior in Zr alloys
S. Muraishi, H. Naito, T. Aizawa
Materials Science of Bulk Metallic Glasses ( 6 ) 4 2005
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Fabrication of nanostructured titanium thin films via N ion implantation and postannealing treatment
S Muraishi, T Aizawa, H Kuwahara
SURFACE & COATINGS TECHNOLOGY 188 260 - 264 2004.11
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Reaction-induced phase separation from supersaturated solid solution to nitride in thin films
S Muraishi, T Aizawa, H Kuwahara
SURFACE & COATINGS TECHNOLOGY 188 431 - 434 2004.11
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Competitive nucleation and growth of {111} Omega with {001} GP zones and theta ' in a stress-aged Al-Cu-Mg-Ag alloy
S Muraishi, S Kumai, A Sato
MATERIALS TRANSACTIONS 45 ( 10 ) 2974 - 2980 2004.10
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Micro structure of N-implanted Ti thin films prepared by ion beam sputtering deposition
S Muraishi, T Aizawa
CERAMIC NANOMATERIALS AND NANOTECHNOLOGY II 148 155 - 162 2004
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Competitive nucleation and growth of {111} Ω′with {001} GP Zones and θ in a stress-aged Al-Cu-Mg-Ag alloy
Shinji Muraishi, Shinji Kumai, Akikazu Sato
Materials Transactions 45 ( 10 ) 2974 - 2980 2004
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Microstructure of N-implanted Ti thin films prepared by ion beam sputtering deposition
Shinji Muraishi
Ceramic Transaction 148 155 - 162 2004
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Real microstructure modeling for stiffness and strength analyses of texture in ores
T Aizawa, Y Suwa, S Muraishi
ISIJ INTERNATIONAL 44 ( 12 ) 2086 - 2092 2004
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イオンビーム技術を用いた表面ガラス構造化
村石信二相澤龍彦
「金属ガラスの最適構造化プロセス」研究会講演概要 1 36 2003
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KUROKAWA Masato, IDE-EKTESSABI Ari, SHIRASAWA Koyo, KUWAHARA Hideyuki, ISHE Naoko, MURAISHI Shinji, TSUTSUMI Sadami, SUZUKI Shigehiko
Biomedical research on trace elements 14 ( 3 ) 219 - 225 2003
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Strengthening of Al-Cu single crystals by stress-oriented Guinier-Preston zones
S Muraishi, N Niwa, A Maekawa, S Kumai, A Sato
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES 82 ( 14 ) 2755 - 2771 2002.9
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Stress-oriented nucleation of Omega-phase plates in an Al-Cu-Mg-Ag alloy
S Muraishi, S Kumai, A Sato
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES 82 ( 2 ) 415 - 428 2002.1
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Stress-Oriented Nucleation of Ω Phase Plates in an Al-Cu-Mg-Ag alloy
Shinji Muraishi
Philosophical Magazine A 82 ( 2 ) 415 - 428 2002
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Yield Shear Stress Anisotropy of Al-Cu Single Crystals Containing Single Variant GP Zones
Shinji Muraishi, Shinji Kumai, Akikazu Sato
Materials Science Forum 396-402 1001 - 1006 2002
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Stress-Assisted Nucleation of Ω Precipitates in Al-Cu-Mg-Ag Alloys
S. Muraishi, S. Kumai, A. Sato
The Proceedings of the 2nd International Conference on Light Materials for Transportation Systems 541 - 546 2001
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Stress-Assisted Nucleation of Ω Precipitates in Al-Cu-Mg-Ag Alloys
S. Muraishi, S. Kumai, A. Sato
The Proceedings of the 2nd International Conference on Light Materials for Transportation Systems 541 - 546 2001
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Al-Cu系合金単結晶の塑性変形に及ぼす析出相配列効果の影響
村石信二, 前川淳, 丹羽信崇, 熊井真次, 佐藤彰一
軽金属学会第100回春期大会講演概要 175/176 2001
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Al-Cu-Mg-Ag合金の初期時効組織に及ぼす外力の効果
村石信二, 熊井真次, 佐藤彰一
軽金属学会第100回春期大会講演概要 173/174 2001
Presentations
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Thermoelectric properties of Mg2Si1－XGeX materials prepared by bulk mechanical alloying and hot pressing
2004
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Zr-Cu 合金薄膜のNイオン注入に伴う組織変化
日本金属学会第137回秋期大会 2005
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Niイオン照射したZr合金のガラス化過程に及ぼす照射エネルギーの影響,
日本金属学会第137回秋期大会 2005
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Amorphization and Phase-Separation of Glassy Alloy Film by Means of Ion Implantation
The 5th international Conference of Bulk Metallic Glasses 2006
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Structural evolution of Zr based alloy films via Ni-implantation
Collected Abstracts of the 2004 Autumn Meeting of The Japan Institute of Metal 2004
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Surface nano structuring of Zr Thin Film via Ni-implantation
11th International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials 2004
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N-Implantation Induced Phase Separation in Zr-Cu Film
2006 TMS Annual Meeting & Exhibition 2006
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Surface Amorphization in Zr Alloy Films via Ni Implantation
2006 TMS Annual Meeting & Exhibition 2006
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Amorphization and Phase-Separation of Glassy Alloy Film by Means of Ion Implantation
The 5th international Conference of Bulk Metallic Glasses 2006
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N-Implantation Induced Phase Separation in Zr-Cu Film
2006 TMS Annual Meeting & Exhibition 2006
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ユニットセルモデルによるポーラス体の強度・剛性解析
2002
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Solid-State Synthesis of Mg2Co alloy by bulk mechanical alloying
2003
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N＋ イオン注入による Ti-X 合金薄膜の反応相分離挙動
2003
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Yield Shear Stress Anisotropy of Al-Cu Single Crystal Containing Single Variant GP zones
2002
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Yield Shear Stress Anisotropy of Al-Cu Single Crystal Containing Single Variant GP zones
2002
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人工骨材料としてのマグネシウムの可能性と安全性
2003
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Thermoelectric properties of Mg2Si1－XGeX materials prepared by bulk mechanical alloying and hot pressing
2003
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イオン注入したa-(Zr,Cu)/Si 基板上薄膜のヤング率評価
日本金属学会講演概要 (第141回・岐阜) 2007
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イオン注入したZr基金属ガラスの内部組織とその力学特性
日本金属学会第140回春期大会 2007
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Controlled Elasticity in Nano-structured Metallic Glass by Ion Implantation
PRICM6 2007
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集中荷重条件下における多層薄膜材料のヤング率に対する複合則の適用
2008年秋期（第143回）日本金属学会 2008
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Surface Amorphization in Zr Alloy Films via Ni Implantation
2006 TMS Annual Meeting & Exhibition 2006
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Controlled Elasticity in Nano-structured Metallic Glass by Ion Implantation
PRICM6 2007
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ナノインデンテーションによるAl-4wt%Cu/Al2Cu 基板上薄膜のヤング率評価
2007
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インデンテーション法による多層膜の弾性率評価法について：Mindlin解を用いた弾性複合則
2008年秋期（第143回）日本金属学会 2008
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Emergence of (001) prefered orientation in AlN film using ultrathin Pt/AlN buffer layer
2009
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Berkovich圧子を模した３角形転位ループモデルによる表面変位の評価
日本金属学会 2009年秋期（第145回）大会 2009
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インデンテーションによる多層薄膜の圧痕周囲のTEM断面組織観察
日本金属学会 2009年秋期（第145回）大会 2009
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Emergence of (001) prefered orientation in AlN film using ultrathin Pt/AlN buffer layer
2009
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Triangular Dislocation Loop Model for Surface Displacement in Indented Thin Films
the 7th Pacific Rim International Conference on Advanced Materials and Processing 2010
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Triangular Dislocation Loop Model for Surface Displacement in Indented Thin Films
the 7th Pacific Rim International Conference on Advanced Materials and Processing 2010
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Phase Separation into Nano-crystalline Nitrides in Ternary Ti-Si-N System via N Implantation
2004
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Thermoelectric properties of Mg2Si1－XGeX materials prepared by bulk mechanical alloying and hot pressing
2003
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Solid-State Synthesis of Mg2Co alloy by bulk mechanical alloying
2003
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Phase Separation into Nano-crystalline Nitrides in Ternary Ti-Si-N System via N Implantation
2004
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Dry Machining Tool Design via Chlorine Ion Implantation
2004
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N＋ イオン注入による非平衡 Ti-N 薄膜の組織制御
2003
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Dry Machining Tool Design via Chlorine Ion Implantation
2004
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Structural evolution of Zr based alloy films via Ni-implantation
Collected Abstracts of the 2004 Autumn Meeting of The Japan Institute of Metal 2004
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Surface nano structuring of Zr Thin Film via Ni-implantation
11th International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials 2004
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Thermoelectric properties of Mg2Si1－XGeX materials prepared by bulk mechanical alloying and hot pressing
2004
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The precipitation microstructure and hardening of stress-aged Al-Cu-Mg-Ag alloy polycrystal
Hyunsup Jeon, Shinji Muraishi
GCIM2024 2024.6
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Strengthening effect of single GP-zone and θ' plate in Al-Cu alloys
Haiwei Zheng, Jianbin Liu, Shinji Muraishi
ICAA19 2024.6
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Relationship between the periodic surface pattern and cracks of Al-3wt%Si-1wt%Fe casting strips fabricated by VT-HSTRC
Yosuke Endo, Shinji Muraishi, Shinji Kumai
Joint workshop of Science Tokyo and Dalian Univ. 2024.10
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Dislocation Dynamics Simulation of Precipitation Hardening by {001} GP zones and θ’ plates in Aluminum Alloys
Shinji Muraishi, Haiwei Zheng, Jianbin Liu
Joint workshop of Science Tokyo and Dalian Univ. 2024.10
Awards
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手島記念賞（博士論文賞）
2003
Research Projects
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配列析出相を含むアルミニウム合金マイクロピラーの力学特性と転位動力学
Grant number：20K05164 2020.4 - 2023.3
日本学術振興会 科学研究費助成事業 基盤研究(C)
村石 信二
Grant amount：\4290000 （ Direct Cost: \3300000 、 Indirect Cost：\990000 ）
析出強化型Al-Mg-Si合金押出材を用いた外力下の配列組織制御を検討した結果、特に負の圧縮応力で応力軸方向に平行な＜001＞β“の針状析出の数密度が増加した。相互作用エネルギ―の観点から、針状析出物の短手方向に正のミスフィットを有する＜001＞β“の析出に外力が作用したことで配列効果が生じたと説明される。このような配列析出組織に硬さ試験を行うと、応力軸と垂直となる面で硬さが減少する硬さの異方性が明らかとなった。またAl-Cu-Mg合金のＧＰＢやＳ”相の針状析出物でも同様な配列効果と硬さの異方性が現れており、針状析出物の配列組織が力学挙動の異方性をもたらしたと考えられる。
マイクロメカニクス理論に基づき、アルミニウムに代表的な<001>針状析出物、｛111｝板状析出物の内側と外側の内部応力場をEshelby介在物法により計算した結果、析出バリアントの幾何学配置によって、すべり面上の転位と正・負の相互作用力を生じるバリアント（Type-B）、ならびに相互作用力が平均してゼロとなるバリアント(Type-A)が存在することを明らかとし、また析出物が容易にはせん断されにくく母相のみが塑性変形する場合でも（不均一介在物問題）、バリアントの幾何学的配置によってType-AとType-Bでは内部応力場の傾向に明らかな違いがあることが明らかとなった。更に、内部応力場中の転位運動を離散化転位動力学法により解析した結果、せん断の外部応力下で転位が張り出す過程で、析出物の内部応力場の符号によって転位運動が大きく影響され、転位の幾何学形状や長さにバリアントの影響が現れること、また転位の移動量から換算した塑性ひずみと外力の関係にも差が生じること、等を明らかとした。 -
Development of novel mechano-luminesence thin film.
Grant number：21760551 2009 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
MURAISHI Shinji
Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）
Mn doped ZnS is promising for the stress induced light emitting material. The present work examined the feasibility of production of ZnS:Mn film by deposition methods, and the photoluminescence behaviors with related to the microstructure of deposited film. The mechanical tests under various stress conditions have been conducted for ZnS:Mn powder. The mixture of ZnS:Mn powder embedded in epoxy shows photo-luminescence (PL) and mechano-luminescence (ML), and the magnitude of ML is enhanced by the concentrated loading condition. Regarding to the ion beam sputtering deposition of ZnS film, neutralized ion beam is required because the polarization charge of ionic nature of target matetial. The clack and peeling of the film during and after deposition can be reduced by intermediate Cu buffer layer between ZnS and Si substrate. X-ray reflection implies the accommodation of interfacial stress caused by lattice mismatch between films and substrate. However, PL behavior is hardly observed in deposited films by IBS and also the resistive heat deposition method. This might be due to the contents of Mn inside the film is insufficient at the substitutional lattice points since subsequent heat treatment in Ar atmosphere provides PL.
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Global Warming in the Proterozoic; extensive decarbonation event in the lower crust and its implications to the surface environment
Grant number：20613003 2008 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
SHI Ji, NAKAMURA Yoshio
Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）
This work is a study on magnetic recording materials used in hard disk drives. The fabrication of current recording media needs ruthenium as underlayers in order to control the growth and properties of the magnetic layers. However, ruthenium is a noble metal that is being rapidly consumed. Therefore, development of ruthenium-free recording media is necessary. In this work aluminum nitride has been used to control the growth and properties of CoPt layers, and perpendicular magnetic anisotropy, which is necessary for magnetic recording, has been successfully realized.
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金属ガラスのバルク化プロセスと多機能最適化プロセス
Grant number：15074202 2003 - 2007
日本学術振興会 科学研究費助成事業 特定領域研究
木村 久道, 近藤 勝義, 三好 元介, 村石 信二, 辻川 正人, 芹川 正, 山浦 真一, 櫻井 雅樹
Grant amount：\58000000 （ Direct Cost: \58000000 ）
1)本開発した高耐食性を示すNi-Cr-P-B系金属ガラス薄帯を使用してセパレータを作製し、燃料電池単セルに組み込んで発電試験を行った結果、ステンレスSUS316材セパレータよりも高い出力密度が得られることを見出した。
2)Zr-Cu-Al三元系合金急冷材中の析出相は、金属ガラス形成組成域よりも低Al濃度側ではZr_2CuあるいはZrCuの金属間化合物が析出、高Al濃度側では未知の結晶相(Zr_5Al_4相あるいはZr_4Al_3相と類似の長周期構造を有する)が析出することを見出した。3)Cu-Zr-Al-Ag金属ガラスの室温〜液体窒素温度までの圧縮試験の結果、試験温度が低下するにつれてヤング率、最大圧縮応力、塑性伸びが大きくなること、およびシアバンドの相対的な量が増加することを見出した。4)バルク金属ガラスの微結晶複合化過程をレーザ照射によって明らかにすると共に特性評価を行い、結晶相の溶融再冷却では、結晶成長速度の遅さが金属ガラス形性能を大きく支配していること、摩擦摩耗特性の評価では、結晶金属と金属ガラスの摩耗特性が異なることを見出した。5)イオン注入による金属ガラス化、窒化、ポーラス化など改質層の形成過程を調査し、それら弾性率が0.5〜1.5倍にコントロールできることを明らかにした。熱処理を必要としない本プロセスが、金属ガラスの表面改質に非常に有効であることを見出した。6)Cu-Zr系複合ターゲットを用いてスパッタ過程での薄膜の結晶化挙動に及ぼす配合組成とスパッタ雰囲気の影響を調べ、Cu比率が35〜80%の比較的広範囲で非晶質構造が形成でき、スパッタガスとして10〜30%の水素を混合することで更に非晶質化が進行できることを明らかにした。
上述したように、高機能特性持ったNi基金属ガラスの開発、Zr-Cu-Al三元系合金急冷材の析出相、および表面層をガラス化し、その物性を明らかにすることなどができ、金属ガラスの応用に際して必要である貴重な基礎的知見が得られた。 -
Self-Lubrication Design for Ceramic Coating via Light-Element Ion Implantation
Grant number：12305047 2000 - 2002
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
AIZAWA Tatsuhiko, MITSUO Atsushi, SUWA Yoshihiro, MURAISHI Shinji, KUWAHARAS Hideyuki
Grant amount：\42930000 （ Direct Cost: \36900000 、 Indirect Cost：\6030000 ）
Ion implantation is an effective surface modification technology since various kinds of elements can be implanted into any targeting materials. In particular, various surface nano-structuring can be accommodated by the light element ion implantation. Three kinds of nanostructuring methods are introduced to investigate the nano-structuring behavior via the ion implantation and to understand the nano-hetero structuring process when these nano-structured materials are in use. Ion-plated titanium nitride films are employed as a common substrate to be nano-structured. The chemical bonding state can be gradually modified with increasing the doses of carbon via ion implantation. This first nano-structuring control in chemical bonding leads to selective hardening for designated surface area. Furthermore, hardened surface is often favored for promotion of wear resistance even in the severe wearing condition. The second nano-structuring is characterized by in-situ formation of non-equilibrium compound and by cluster formation of implanted atoms. The imposed aluminum has loose bonding with the targeting material system. This results in the formation of non-equilibrium cubic solid solution (TI, Al) N. While, a part of imposed aluminum still remains as a metallic aluminum phase. With increasing the bulk temperature, these aluminum atoms make counter diffusion from the depth to the surface, resulting in the reaction with penetrating oxygen atoms from surface and the in-situ formation of dense *-alumina surface layer. This works as a protective layer to prevent titanium nitride from further oxidation even at the elevated temperature, where the original titanium nitride films can be easily oxidized. The third nano-structuring is characterized by high mobility and reactivity of implanted atoms in TiN. The implanted chlorine has no or little distinct bonding with the lattice atoms of TiN. They might well be trapped at the dislocation in TiN without significant change of lattice constants. Since they have sufficient mobility to diffuse in the columnar TiN to the surface, the surface tribo-chemical reaction in the wear track is modified to make in-situ formation of intermediate phase oxides or Magneli phase oxides. Owing to their shearing deformation, the contact surface between TiN and work materials is self-lubricated to preserve low friction and low wearing state. This surface nano-structuring with nano-hetero structural modification becomes a new material design to improve the wear toughness.
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Solid-State Synthesis and Processing of Advanced Magnesium Alloys toward Non-traditional Functionality
Grant number：11225205 1999 - 2002
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
AIZAWA Tatsuhiko, MITSUO Atsushi, KUWAHARA Hideyuki, KONDOH Katsuyoshi, WENBO Du
Grant amount：\65600000 （ Direct Cost: \65600000 ）
Toward nontraditional functionality of advanced magnesium alloys and compounds, this project is concerning with research and development of hydrogen storage, thermoelectricity and bio-compatible tissues. At the same time, the solid-state processing and forming, the cold-coating and bio-compatible film formation are developed to produce these new magnesium alloys and compounds. Among them, our developed bulk mechanical alloying (BMA) is further promoted for fine control of non-equilibrium phase by amorphization and nano-structuring, for fine control of contents in multi-phase system and for solid-state processing from granules and platelets. At first, Mg-Ni system is employed as a target system for non-equilibration via BMA. Hydrogenation and de-hydrogenation characteristics are significantly improved by this Ni-enrichment via nonequilibration. On this fundamental study in the binary system, material search for ternary alloys becomes promising through BBC-structuring. Mg-Si system is next selected to demonstrate the effectiveness of the solid-state processing. In the conventional processings like self-heating synthesis and melting, the formation of Mg_2Si takes place above the melting point of magnesium. This leads to partial reaction to Mg_2Si and coursing of grain size for the synthesized Mg_2Si. In the present method, Mg_2Si is sold-state synthesized at room temperature and the grain size is refined to have the equivalent particle size to that of refined silicon before reaction. On this fundamental knowledge, the solid-state recycling is proposed to fabricate the reinforced composite magnesium alloy parts and performs with in-situ precipitated Mg_2Si in fine and uniform. In addition, various hydrogen storage alloys like Mg_2Co are invented by super-saturation through non-equilibration both in Mg-Co and Mg-Fe systems. The Cold-coating is proposed to make the hydrogen storage films in Mg-Ni/Co/Fe systems even on the polymer substrates. This success enables us to make research and development of new material film systems for fast-rate hydrogenation and de-hydrogenation and to profoundly investigate the functional films with metal-insulator transition through hydrogenation and de-hydrogenation. New dipping method is further invented to yield the hydroxiapatite coating (Hap) on the pure magnesium plate as a bio-compatible film for promotion of recovery of hard tissues.