Cooling-induced reverse martensitic transformation in Co-based Heusler alloys

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630260
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• 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(Renkei-kenkyūsha): OHNUMA Ikuo 東北大学, 大学院工学研究科, 准教授 (20250714) ; OMORI Toshihiro 東北大学, 大学院工学研究科, 助教 (60451530) ; UMETSU Rie 東北大学, 金属材料研究所, 准教授 (60422086)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: マルテンサイト変態 / 冷却誘起逆変態

Outline of Final Research Achievements

Recently, in the CoCrGaSi Hesler alloy system, an anomalous martensitic transformation (AMT), where the L10 martensite phase transforms again to L21 parent phase on cooling, have been found. Moreover, cooling-induced shape memory effect has first been reported by using the thermoelastic AMT.
In this study, for the CoCrGaSi Hesler alloys, basic physical and superelastic properties were examined in order to clarify the origin of the abnormal phenomenon. Through this project, it has been suggested that its origin may be due to magnetic transformations in both the parent and martensite phases.

Free Research Field

金属材料学