Design principle and development of super-long life shape memory alloy based on Nitinol

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04143
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Inamura Tomonari 東京工業大学, 科学技術創成研究院, 教授 (60361771)
• Co-Investigator(Renkei-kenkyūsha): HOSODA Hideki 東京工業大学, 科学技術創成研究院, 教授 (10251620) ; TAHARA Masaki 東京工業大学, 科学技術創成研究院, 助教 (80610146)
• Research Collaborator: SHINOHARA Yuri 東京工業大学, 科学技術創成研究院, 助教 ; KISE Sumio (株)古河テクノマテリアル ; YAMASHITA Fumiyoshi (株)古河テクノマテリアル ; FUJII Misato (株)古河テクノマテリアル
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 形状記憶合金 / 生体材料 / 組織制御 / マルテンサイト変態

Outline of Final Research Achievements

Effects of the magnitude of incompatibility at domain-walls in martensite microstructure of Ti-Ni based shape memory alloys were investigated in this study.Numerical analysis on the incompatibility of domain-walls showed that the incompatibility can be vanished or very small at certain kinds of domain-boundary in Ti-Ni based alloys with B2-B19 or B2-B19' martensitic transformation. One of the alloys which satisfies the condition for the very small incompatibility exhibited no shift in transformation temperature upon thermal cycling more than 200 cycles. This result implies that the super-long life shape memory alloy can be developed in Ti-Ni based alloys.

Free Research Field

金属組織学