As-Cast High Entropy Shape Memory Alloys of (TiHfX)50(NiCu)50 with Large Recoverable Strain and Good Mechanical Properties

作者：Zhao, Guangwei^*; Li, Da; Xu, Guoxiong; Fang, Dong; Ye, Yongsheng; Huang, Caihua; Shi, Zengmin

来源：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2022, 31(12): 10089-10098.

DOI：10.1007/s11665-022-06990-3

• high entropy alloys
• martensitic phase transformation
• mechanical properties
• shape memory alloys
• superelasticity

The proposal of a high entropy shape memory alloy (HESMA) has opened a new field for the application of high-entropy alloys (HEAs) and the development of shape memory alloys (SMAs). However, to date, the recoverable strains of reported HESMAs have been generally modest, and their preparation processes have been complex. In this work, novel as-cast (TiHfX)(50)(NiCu)(50) HESMAs with a very large recoverable strain (9.4%) and excellent mechanical properties were fabricated. A lower elastic modulus and lattice distortion strengthening effect were considered to contribute to the large recoverable strain characteristics of HESMAs. The strategy of finding HESMAs with good comprehensive properties by designing low C-v values may provide useful guidelines in this field.