Abstract The martensitic transformation and superelasticity of Au7Cu5Al4 shape memory alloy were investigated. Polycrystalline Au7Cu5Al4 microwires with a diameter of 20–120 μm were fabricated using a melt-extraction technique. The brittle failure of microwires with an oligocrystalline structure obtained by cyclic heat treatment was significantly suppressed. Such microwires exhibited a recoverable strain of 5.6% under 6.8% applied strain at 90 °C. Stable superelastic behavior with complete shape recovery was observed up to 119 °C under 1.8% applied strain.

中文翻译：

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Au7Cu5Al4形状记忆合金微丝中的马氏体相变和超弹性

摘要 研究了Au7Cu5Al4形状记忆合金的马氏体相变和超弹性。使用熔体提取技术制造直径为 20-120 μm 的多晶 Au7Cu5Al4 微线。通过循环热处理获得的具有低晶结构的微丝的脆性破坏得到显着抑制。这种微丝在 90°C 下在 6.8% 的外加应变下表现出 5.6% 的可恢复应变。在 1.8% 的外加应变下，在高达 119 °C 的温度下观察到具有完全形状恢复的稳定超弹性行为。