形状记忆合金
材料科学
单斜晶系
无扩散变换
铸造
马氏体
合金
差示扫描量热法
相(物质)
体积分数
扫描电子显微镜
延展性(地球科学)
冶金
复合材料
热力学
结晶学
蠕动
化学
微观结构
晶体结构
物理
有机化学
作者
Weihong Gao,Xiaoyang Yi,Bin Sun,Yudong Fu,Xianglong Meng
标识
DOI:10.1016/j.pnsc.2022.03.002
摘要
ZrCu-based alloys, as one of the most potential high-temperature shape memory alloys, show quite high martensitic transformation temperature, relatively low price for the raw materials, and good casting fluidity. In this work, the martensitic transformation (MT) and shape memory effect of (ZrCu)50-xTax high-temperature shape memory alloys were systematically investigated. Both X ray diffraction and SEM backscattered electron image demonstrated the coexistence of the main phase monoclinic martensite phase and the second phase Ta2Cu. SEM results also revealed that increasing Ta content resulted in a larger volume fraction of Ta2Cu phase. Differential scanning calorimetry results showed that the MT temperatures remarkably increased with Ta addition. The ductility of the (ZrCu)50-xTax alloys was reduced to some degree with increasing Ta content. The shape memory effect was improved significantly, in which (ZrCu)98Ta2 alloy showed the 6.19% maximum recovery strain during 8% pre-strain under compression at 25 °C.
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