A dual-phase Ni-Mn-Ga-Gd high-temperature shape memory alloy with large shape recovery ratioZhang Xin*, Liu Qingsuo

Abstract:

In this paper, the shape memory effect and recovery ratio of dual-phase Ni58Mn25Ga16.9Gd0.1 alloy were investigated by bend test. The results showed that this alloy exhibited goodSshape recovery capability. The recovery ratio of 86% was observed with bend pre-strain of 4.6% after heating, which was larger than that of other reported dual-phase Ni-Mn-Ga alloys. This characteristic was attributed to the critical slip stress increasing of γ phase by small amount of Gd addition, causing the ability improvement of γ phase to resist irreversible deformation.

Key words:High-temperature shape memory alloy; Ni-Mn-Ga alloys; Shape recovery ratio