Anomalies of martensitic transformations appearing at very low temperatures-their origin and universality-

2014 Fiscal Year Final Research Report

• Project/Area Number: 22226011
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Physical properties of metals
• Research Institution: Tohoku University
• Principal Investigator: KAINUMA Ryosuke 東北大学, 工学(系)研究科(研究院), 教授 (20202004)
• Co-Investigator(Kenkyū-buntansha): MURAKAMI Yasukazu 東北大学, 多元物質科学研究所, 准教授 (30281992) ; OHNUMA Ikuo 東北大学, 大学院工学研究科, 准教教 (20250714) ; OMORI Toshihiro 東北大学, 大学院工学研究科, 助教 (60451530)
• Co-Investigator(Renkei-kenkyūsha): UMETSU Rie 東北大学, 金属材料研究所, 准教授 (60422086) ; TERADA Kenjiro 東北大学, 大学院工学研究科, 准教授 (40282678)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: マルテンサイト変態 / 超弾性効果 / 低温

Outline of Final Research Achievements

Recently, some anomalies of martensitic transformations (MTs), such as strain glass in the NiTi alloy, thermal-transformation arrest phenomenon and heating-induced MT in NiCoMnIn alloys, have been found at very low temperatures.
In this study, for the NiTi, NiCoMnIn, and CuAlMn alloys, basic physical and superelastic properties in the temperature region from 10 to 200 K were examined in order to clarify the origin and the universality of the abnormal properties.　Through this project, the origins of them have almost been clarified and a candidate for superelastic materials, which can be operated at cryogenic temperatures, has been found in the CuAlMn alloy system.

Free Research Field

金属材料学