title: A jumping shape memory alloy under heat.
abstract: Shape memory alloys are typical temperature-sensitive metallic functional materials due to superelasticity and shape recovery characteristics. The conventional shape memory effect involves the formation and deformation of thermally induced martensite and its reverse transformation. The shape recovery process usually takes place over a temperature range, showing relatively low temperature-sensitivity. Here we report novel Cu-Al-Fe-Mn shape memory alloys. Their stress-strain and shape recovery behaviors are clearly different from the conventional shape memory alloys. In this study, although the Cu-12.2Al-4.3Fe-6.6Mn and Cu-12.9Al-3.8Fe-5.6Mn alloys possess predominantly L2(1) parent before deformation, the 2H martensite stress-induced from L2(1) parent could be retained after unloading. Furthermore, their shape recovery response is extremely temperature-sensitive, in which a giant residual strain of about 9% recovers instantly and completely during heating. At the same time, the phenomenon of the jumping of the sample occurs. It is originated from the instantaneous completion of the reverse transformation of the stabilized 2H martensite. This novel Cu-Al-Fe-Mn shape memory alloys have great potentials as new temperature-sensitive functional materials.
authors.affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P.R. China.
authors.forename: Shuiyuan
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Omori
authors.affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P.R. China.
authors.forename: Cuiping
authors.initials: C
authors.lastname: Wang
authors.affiliation: School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Nagasako
authors.affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P.R. China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Ruan
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kainuma
authors.affiliation: Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan.
authors.forename: Kiyohito
authors.initials: K
authors.lastname: Ishida
authors.affiliation: Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P.R. China.|Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, P. R. China.
authors.forename: Xingjun
authors.initials: X
authors.lastname: Liu