Thermal stability of dual-phase Ni58Mn25Ga17 high-temperature shape memory alloy

Received 1 February 2010; received in revised form 26 February 2010; accepted 26 February 2010. published online 04 March 2010.

The effect of thermal cycling on the microstructure, martensitic transformation behavior and shape memory characteristic of the dual-phase Ni58Mn25Ga17 high-temperature shape memory alloy was investigated. The Ni58Mn25Ga17 alloy showed high thermal stability upon cycling up to 500 thermal cycles between 298 and 923K without obvious differences in its microstructure and martensitic transformation behavior. Shape memory strain decreased slightly after 500 thermal cycles but remained over 2.6%.

Keywords: Ni–Mn–Ga, Dual phases, Shape memory alloys, Martensitic transformation, Thermal stability

a School of Energy and Power Engineering, North China Electric Power University, Beijing 102206, China

b School of Material Science and Engineering, Beihang University, Beijing 100091, China

c Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology, Beihang University, Beijing 100091, China

Corresponding author at present address: Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology, Tel.: +86 10 82315989 100; fax: +86 10 82338200.

PII: S1359-6462(10)00128-4

doi:10.1016/j.scriptamat.2010.02.044

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