ABSTRACT

Among the alloys with SME, TiNiHf is positioned as a high-temperature alloy with SME and is one of the most promising alloys because of its higher temperatures of martensitic transformations and low cost (Liang et al. 2001, Dalle et al. 2000). Adding copper to TiNiHf alloys with SME improves their thermal stability and gives a reversible SME (Dalle et al. 2000, Meng et al. 2005, Meng et al. 2002). Besides, TiNiHfCu alloy with SME shows excellent glass-forming ability and superplasticity (Meng et al. 2002). This makes it possible to produce very small parts and parts of complex shape in micro-electromechanical systems.