Martensitic transformation and shape memory effect in Mn-rich Cu-Mn-Al alloys

伊東 達矢; Xu, S.*; Xu, X.*; 大森 俊洋*; 貝沼 亮介*

Shape Memory and Superelasticity, 9 Pages, 2025/00

https://doi.org/10.1007/s40830-025-00519-y

The microstructure, crystal structures, cold workability, and martensitic transformation temperatures of several CuMnAl (40 55; 10 13; at%) alloys were analyzed. For the first time, martensitic transformation was revealed Mn-rich Cu-Mn-Al alloys. The surface relief of the martensite phase reversibly appeared and disappeared during cooling and heating, along with small thermal hysteresis, implying a thermoelastic transformation. The crystal structures of the parent and martensite phases are B2 and 2M(BCT), respectively, with cMnAl (at%) sample. This alloy demonstrates moderate cold workability and cost-effectiveness, exhibiting potential as an alternative for conventional shape memory alloys in various applications.