锆基形状记忆合金的研究进展

Zr-based shape memory alloys (SMAs) have the characteristics of high phase transition temperature, large shape memory effect (SME) and low magnetic susceptibility. They have gradually attracted the attention of researchers, and show good application prospects in aerospace, aviation, energy and biomedical fields. Zr-based shape memory alloys mainly include Zr-Cu based high temperature shape memory alloys and Zr-Nb-based biomedical shape memory alloys. The martensitic transformation start temperature of Zr-Cu based alloy can reach 1000 ℃, and the maximum shape memory effect is 6.87%. It has the advantages of low cost and easy processing. Compared with medical implant materials such as austenitic stainless steel, CoCr alloy and titanium alloy, Zr-Nb-based alloy has lower magnetic susceptibility, which can effectively avoid the impact on nuclear magnetic resonance imaging (MRI), and improve the detection accuracy. This paper reviews the research progress of Zr-Cu-based and Zr-Nb-based shape memory alloys at home and abroad in recent years, focuses on the microstructure, phase transformation mechanism, shape memory properties, mechanical properties, magnetic susceptibility and biocompatibility of the alloys, and puts forward the research directions that need to be paid more attention in the future.