Ageing treatments were performed on Ti-50.53 at.% Ni shape memory alloy corrugated gasket (SMA-CG) units. The results of phase transition temperature, shape-setting, compression-resilience performance, and the shape memory effect (SME) of NiTi corrugated units were investigated. The experimental results show that high austenite finish temperatures could be achieved at 500°C and at 400°C aged for a long time, while the martensite finish temperatures were basically above room temperature. The peak value of the austenite finish temperature was found to be 500°C. The shape-setting result was better with the increase of ageing temperature and ageing time. It was stable when units were constrain-treated at 500°C and the ageing time was longer than 30 min. As the strain increases, the resilience rate of the unit decreased rapidly. The resilience rate decreased with the ageing process. Most of the aged units exhibited good SME when the maximum strain was less than 40%. There was the best recoverability when the ageing treatment was performed at 500°C for 60 min.

中文翻译：

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时效处理对NiTi SMA波纹结构的定形和形状记忆效应的影响

在Ti-50.53 at。％Ni形状记忆合金波纹垫片（SMA-CG）单元上进行了时效处理。研究了NiTi波纹单元的相变温度，定型，压缩回弹性能和形状记忆效应（SME）的结果。实验结果表明，在500°C和400°C时效下，长时间可达到高奥氏体终点温度，而马氏体终点温度基本上高于室温。发现奥氏体终点温度的峰值为500℃。随着时效温度和时效时间的增加，定型效果更好。当单元在500°C进行约束处理且老化时间超过30分钟时，它是稳定的。随着应变的增加，单元的弹性率迅速下降。弹性率随老化过程而降低。当最大应变小于40％时，大多数老化单元显示出良好的SME。在500°C下进行60分钟的时效处理时，可恢复性最佳。