The effect of Tb substitution for Ni on microstructure, martensitic transformation and cyclic stability of elastocaloric effect in Ni–Mn–Sn magnetic shape memory alloys

• DOI: 10.1016/j.jmrt.2022.07.018
• Publication Date: 2022-07-09T04:46:31Z
• Authors: Wanyuan Gui; Yuhai Qu; Yuxian Cao; Yunzhi Zhao; Chenxu Liu; Qing Zhou; Jie Chen; Yahui Liu
• Keywords: Diffusionless transformation; Volume fraction

Cyclic stability of elastocaloric effect is the key factor that restricts cooling application Ni–Mn–Sn alloys fabricated by conventional melting technique. Element doping an effective way to enhance performance materials. In this work, Tb substitution for Ni on martensitic transformation (MT) temperature, microstructure, mechanical properties and cyclic in Ni43.5–xTbxMn45.5Sn11 (x = 0, 0.6, 1.2 1.8) magnetic shape memory has been investigated. MT temperatures increase with increasing x from 0 then decrease further 1.8. The introduces γ phase (Tb-rich second Tb-doping alloys). volume fraction increases content thus content. Among these alloys, Ni42.3Tb1.2Mn45.5Sn11 alloy shows a large adiabatic temperature change 10.0 K induced applying uniaxial stress 550 MPa. addition, constant 6.5 no apparent degradation under compressive 350 MPa during 1000 cycles alloy. excellent make promising candidate room-temperature application. underlying mechanism enhanced cyclability also revealed.