A study of beta titanium superelastic alloys with small transformation stress change during cyclic deformation

• Project/Area Number: 17K14833
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Shinohara Yuri 東京工業大学, 科学技術創成研究院, 助教 (30755864)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: マルテンサイト / 形状記憶合金 / ω相 / チタン合金 / 構造・機能材料

Outline of Final Research Achievements

Effect of ω phase on pseudoelasticity in β-Ti alloys was investigated in this study. Cyclic loading-unloading tensile tests were performed at various temperatures using special alloy; volume fraction of ω phase of this alloy is not affected by deformation temperature. Stress for inducing martensite decreases as cycle number at the range of -115 ～ 120℃ increases. Stress for reverse transformation also decreases as cycle number at -115℃ increases. These results imply that shuffling magnitude of ω phase affects pseudoelasticity of β-Ti alloy. Quantitative evaluation of shuffling magnitude was attempted by pair distribution function (PDF) analysis.

Academic Significance and Societal Importance of the Research Achievements

本研究ではω相のシャッフリング量が機能劣化に影響を及ぼすことが示唆されたが，シャッフリング量の決定には至らず，ω相のシャッフリング量と機能劣化を直接結び付けるには至らなかった．しかし，結晶の局所構造を加熱その場環境下で解析可能な結晶PDF解析は，形状記憶・超弾性合金の研究において今後強力なツールになることが期待される．本研究は結晶PDF解析を金属材料に適用した数少ない事例であり，学術的に意義があると言える．

Research Products

• [Journal Article] Rank-1 Connection of Kink Bands Formed by Non-Parallel Shears (2020)
  • Author(s): T. Inamura, Y. Shinohara
  • Journal Title: MATERIALS TRANSACTIONS Volume: 61 Issue: 5 Pages: 870-874
  • DOI: 10.2320/matertrans.MT-MM2019005
  • NAID: 130007835702
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2020-04-01
  • Peer Reviewed
• [Journal Article] Goss Orientation Evolution in Ti–5.5Mo–8Al–6Zr Shape Memory Alloy upon Heat Treatment (2019)
  • Author(s): Shinohara Yuri、Sasaki Tomoya、Tahara Masaki、Hosoda Hideki、Inamura Tomonari
  • Journal Title: MATERIALS TRANSACTIONS Volume: 60 Issue: 9 Pages: 1890-1897
  • DOI: 10.2320/matertrans.M2019039
  • NAID: 130007695334
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2019-09-01
  • Peer Reviewed
• [Journal Article] Development of <001>-fiber texture in cold-groove-rolled Ti-Mo-Al-Zr biomedical alloy (2018)
  • Author(s): Yuri Shinohara, Yoshiki Matsumoto, Masaki Tahara, Hideki HOSODA, Tomonari Inamura
  • Journal Title: Materialia Volume: 1 Pages: 52-61
  • DOI: 10.1016/j.mtla.2018.07.008
  • Peer Reviewed
• [Journal Article] EFFECT OF CROSS SECTIONAL REDUCTION RATE ON THE FORMATION OF〈001〉FIBER TEXTURE IN Ti-Mo-Al-Zr ALLOY WIRE (2017)
  • Author(s): Yoshiki Matsumoto, Yuri Shinohara, Masaki Tahara, Hideki Hosoda, Tomonari Inamura
  • Journal Title: Proceedings of the Biomaterials International 2017 Volume: -
• [Presentation] 薄板状マルテンサイトにおけるバリアント結合則のRank-1接続条件に基づく解析 (2020)
  • Author(s): 篠原百合，菱田 真由子，稲邑 朋也
  • Organizer: 日本鉄鋼協会 第179回春季講演大会
• [Presentation] Effect of the cross-sectional area reduction rate on the formation of <001>-fiber texture in Ti-5.5Mo-8Al-6Zr alloy wire (2019)
  • Author(s): Yuri Shinohara, Yoshiki Matsumoto, Masaki Tahara, Hideki Hosoda, Tomonai Inamura
  • Organizer: The 14th World Conference on Titanium
  • Int'l Joint Research
• [Presentation] Fe-Ni-C合金のレンズマルテンサイトにおけるバリアント結合面のRank-1接続に基づく解析 (2019)
  • Author(s): 篠原 百合，赤羽 里夢，稲邑 朋也
  • Organizer: 日本金属学会 2019年秋期講演大会
• [Presentation] Ti-Ni基合金のマルテンサイト変態・逆変態サイクルに伴う変態温度変化と不適合性の関係 (2019)
  • Author(s): 丸田 彩佳，篠原 百合，田原 正樹，細田 秀樹，稲邑 朋也
  • Organizer: 日本金属学会 2019年秋期講演大会
• [Presentation] Fe-Ni-C合金における薄板状マルテンサイトのバリアント結合則 (2019)
  • Author(s): 菱田 真由子，篠原 百合，稲邑 朋也
  • Organizer: 日本金属学会 2019年秋期講演大会
• [Presentation] Ti-5.5Mo-8Al-6Zr 合金の再結晶集合組織に及ぼす変形組織とα相の影響 (2018)
  • Author(s): 篠原百合, 細田秀樹, 稲邑朋也
  • Organizer: 2018年日本金属学会秋期講演大会
• [Presentation] Ti-22Nb-2Al 形状記憶合金における自己調整組織のスケール不変性 (2017)
  • Author(s): 長内大輔，篠原百合，田原正樹，細田秀樹，稲邑朋也
  • Organizer: 2017年金属学会秋期大会
• [Presentation] Ti-5.5Mo-8Al-6Zr 合金における再結晶集合組織の初期形成過程 (2017)
  • Author(s): 篠原百合，稲邑朋也
  • Organizer: 2017年金属学会秋期大会
• [Presentation] Effect of Testing Temperature on Deformation Behavior of a Ti-Au-Cr-Zr Superelastic Alloy (2017)
  • Author(s): Yuri Shinohara，Masaki Tahara，Tomonari Inamura，Hideki Hosoda
  • Organizer: International Conference on Martensitic Transformations
  • Int'l Joint Research
• [Presentation] The Formation of <100> Fiber Texture in Ti-Mo-Al-Zr Alloy Wire by Cold Groove Rolling (2017)
  • Author(s): Yoshiki Matsumoto, Yuri Shinohara, Masaki Tahara, Hideki Hosoda, Tomonari Inamura
  • Organizer: The 2nd International Symposium on Biomedical Engineering
  • Int'l Joint Research
• [Presentation] EFFECT OF CROSS SECTIONAL REDUCTION RATE ON THE FORMATION OF〈001〉FIBER TEXTURE IN Ti-Mo-Al-Zr ALLOY WIRE (2017)
  • Author(s): Yoshiki Matsumoto, Yuri Shinohara, Masaki Tahara, Hideki Hosoda, Tomonari Inamura
  • Organizer: Biomaterials International 2017
  • Int'l Joint Research