Abstract The internal friction at temperature up to 980 K in Ni50.3Ti29.7Zr20 (at.%) high temperature shape memory alloy was investigated. A relaxation peak was observed at about 750 K for 0.1 Hz. Its activation parameters were determined, Hact = 1.82 ± 0.04 eV, τ0 = 2.22 × 10−12 s. Similar relaxation peak with the activation enthalpy of about Hact = 1.42 eV was observed in Ni Ti binary alloy at a slightly lower temperature. Alloying of Zr is found to increase the activation enthalpy of this relaxation. The mechanism of this relaxation was discussed based on a Zener relaxation related to the short-range diffusion of Ni.

中文翻译：

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Ni50.3Ti29.7Zr20形状记忆合金的高温内摩擦

摘要 研究了Ni50.3Ti29.7Zr20 (at.%)高温形状记忆合金在高达980 K温度下的内摩擦。在大约 750 K 处观察到一个弛豫峰，频率为 0.1 Hz。确定其激活参数，Hact = 1.82 ± 0.04 eV，τ0 = 2.22 × 10−12 s。在稍低的温度下，在 Ni Ti 二元合金中观察到类似的弛豫峰，其活化焓约为 Hact = 1.42 eV。发现合金化 Zr 会增加这种松弛的活化焓。基于与 Ni 的短程扩散相关的齐纳弛豫讨论了这种弛豫的机制。