Abstract Elastocaloric effects in shape memory alloys are usually caused by latent heat associated with the stress-induced martensitic transformation. We report here that the rubber-like behavior of the R-phase in nanocrystalline Ti-50.8Ni (at.%) wires, realized by an aging heat treatment under tensile stress, also contributes a significant elastocaloric effect. The efficiency of the elastocaloric effect caused by the rubber-like behavior is higher than that caused by the stress-induced B2 ↔ B19′ transformations because of the small energy dissipation. The usage of the rubber-like behavior is a method to extend the temperature window of the elastocaloric effect in shape memory alloys.

中文翻译：

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由 Ti-50.8Ni (at.%) 合金纳米晶线的橡胶状行为引起的弹性热效应

摘要 形状记忆合金中的弹性热效应通常是由与应力引起的马氏体转变相关的潜热引起的。我们在此报告，纳米晶 Ti-50.8Ni (at.%) 线中 R 相的橡胶状行为，通过拉伸应力下的老化热处理实现，也有助于显着的弹性热效应。由于能量耗散小，由类似橡胶的行为引起的弹性热量效应的效率高于应力诱导的 B2 ↔ B19' 转变引起的效率。橡胶状行为的使用是一种扩展形状记忆合金中弹性热效应的温度窗口的方法。