Zr50Cu25Ni7.5Co17.5 high-temperature shape memory alloy with excellent thermal stability and large recovery strain, and the associated microstructural deformation mechanism
作者： Weihong Gao , Xiaoyang Yi , Gangbing Song , Zhenyou Wang , Xianglong Meng
DOI: 10.1016/J.MATDES.2020.109108
关键词:
摘要: Abstract In this study, we produced a novel Zr50Cu25Ni7.5Co17.5 high-temperature shape memory alloy with the aim of achieving high thermal stability and good effect. Differential scanning calorimetry compression cycle were utilized to determine phase transformation temperature effect alloy, transmission electron microscopy (TEM) was employed investigate microstructure clarify corresponding deformation mechanism. We found that exhibited excellent achieved best maximum recovery strain 6.87% (8% pre-strain) observed date, making it promising alloy. The TEM results indicated that, during primary stage cycle, small number (001) compound twins de-twinning numerous contraction formed. As stress increased, increasing numbers nanoscale (021) (111) type-I formed, shift displacement type-B planar defect expanded from 3d ~ (001) 8d ~ (001). Furthermore, newly twin extension contributes large in observed.
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