Abstract Ni-Mn-Ga is commonly used as a room temperature shape memory alloy. With the doping of Co and Cu, its phase transformation temperature increased to around 500 K, which can be used as high temperature shape memory alloys, and the superelasticity and shape memory strains are improved as well. Here, giant recoverable strain 16.3% is reported in a Heusler type Ni53Mn24Ga21Co1Cu1 microwire, prepared by rapid solidification via the Taylor-Ulitovsky method, with a diameter of 140 μm. Within a 150 K temperature range, the microwire maintains superelastic property of more than 10%. It has high cycle stability and the superelasticity remains almost unchanged after 100 cycles test at 523.15 K. It was also found that the energy loss density of the heat treated microwire is about twice than that of as-prepared microwire.

中文翻译：

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Ni53Mn24Ga21Co1Cu1微丝中的巨大高温超弹性

摘要 Ni-Mn-Ga 是常用的常温形状记忆合金。随着Co和Cu的掺杂，其相变温度提高到500 K左右，可用作高温形状记忆合金，超弹性和形状记忆应变也得到改善。在这里，在 Heusler 型 Ni53Mn24Ga21Co1Cu1 微丝中报告了 16.3% 的巨大可恢复应变，该微丝是通过 Taylor-Ulitovsky 方法快速凝固制备的，直径为 140 μm。在 150 K 温度范围内，微丝保持超过 10% 的超弹性。它具有高循环稳定性，在 523.15 K 下经过 100 次循环测试后超弹性几乎保持不变。还发现热处理过的微丝的能量损失密度约为制备的微丝的两倍。