Abstract Effects of post-aging cooling rate (water quenched, WQ, and furnace cooled, FC) on the shape memory properties of polycrystalline Ni45.3Ti34.7Hf15Pd5 alloys were studied. Their functional properties such as transformation temperatures, hysteresis, elastic energy, superelastic behavior and recoverable strain were found to be closely related to the post-aging cooling rate. Martensite start temperature decreased from 77 °C for WQ sample to 22 °C for FC sample. Impressive shape memory effect was observed under a huge compressive stress of 1 GPa with recoverable strains of 2.2 % and 2.5 % for the water quenched and furnace cooled samples, respectively. While both WQ and FC alloys showed perfect superelasticity for a wide temperature range, the WQ sample showed superelasticity at higher temperatures above 100 °C.

中文翻译：

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Ni45.3Ti34.7Hf15Pd5 形状记忆合金中时效冷却速率的影响

摘要 研究了时效后冷却速率（水淬WQ 和炉冷FC）对多晶Ni45.3Ti34.7Hf15Pd5 合金形状记忆性能的影响。发现它们的功能特性如转变温度、滞后、弹性能、超弹性行为和可恢复应变与后时效冷却速率密切相关。马氏体起始温度从 WQ 样品的 77 °C 降至 FC 样品的 22 °C。在 1 GPa 的巨大压应力下观察到令人印象深刻的形状记忆效应，水淬和炉冷样品的可恢复应变分别为 2.2% 和 2.5%。虽然 WQ 和 FC 合金在很宽的温度范围内都表现出完美的超弹性，但 WQ 样品在高于 100 °C 的更高温度下表现出超弹性。