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High Strain Rate and Quasi-Static Compressive Behaviors of Ni-Ti Shape Memory Alloy

机译：Ni-Ti形状记忆合金的高应变率和准静态压缩行为

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摘要

When materials undergo impact loading, an adiabatic deformation condition is imposed. Due to the latent heat generation in the phase transformation of shape memory alloy (SMA), the mechanical behavior of SMA will differ in the dynamic loading condition. In this work, compressive behaviors in the Kolsky bar impact experiment and quasi-static test were compared to investigate the adiabatic behavior of shape memory alloy. Ni50.75-Ti49.25 alloy was chosen as the test specimen. The alloy retains its austenite phase at room temperature and martensite phase at temperatures below -6.2 degrees C. Hence, it is considered that compressive loading at a low temperature will cause martensite reorientation and will induce austenite-martensite phase transformation at the high temperature. Based on this argument, quasi-static tests conducted in a temperature controlling chamber and Kolsky bar impact experiments were carried out at the low and high temperatures. Consequently, the results of the quasi-static tests and the dynamic tests did not significantly differ at low temperatures below -10 degrees C at which the martensite reorientation occurred. However, at room temperature, the dynamic test revealed higher stress plateaus than in the quasi-static tests. This distinct behavior at room temperature indicates that the latent heat associated with the austenite-martensite transformation can be a considerable factor in the mechanical behavior of the shape memory alloys at high strain rates.
机译：当材料承受冲击载荷时，会施加绝热变形条件。由于形状记忆合金（SMA）的相变中会产生潜热，因此SMA的机械性能在动态载荷条件下会有所不同。在这项工作中，比较了Kolsky棒冲击试验和准静态试验中的压缩行为，以研究形状记忆合金的绝热行为。选择Ni50.75-Ti49.25合金作为试样。该合金在室温下保持其奥氏体相，而在低于-6.2摄氏度的温度下保持其马氏体相。因此，认为在低温下的压缩载荷将导致马氏体重新取向，并在高温下引起奥氏体-马氏体相变。基于这一论点，在温度控制室中进行了准静态测试，并在低温和高温下进行了Kolsky棒材冲击试验。因此，在低于-10℃的低温下发生马氏体重新取向的准静态试验和动态试验的结果没有显着差异。但是，在室温下，动态测试显示的应力平稳性高于准静态测试。在室温下这种不同的行为表明，与奥氏体-马氏体相变相关的潜热可能是形状记忆合金在高应变速率下的机械行为的重要因素。

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