Shape memory alloys (SMAs) are vital in many advanced applications, such as micro-electro-mechanical systems (MEMS). Therefore, this work aimed at studying the effect of thermo-mechanical treatment in conjunction with alloying elements modification on improving the mechanical properties and shape memory effect (SME) of Cu–Al–Ni SMAs. In this study, the samples were divided into two groups: the first group was solution treated at 900 °C for 30 min. (S.T), and the other group was hot-rolled at 900 °C followed by solution treatment at 900 °C for 30 min. (H.R.S.T). The results showed that the hardness of the samples decreased with increasing the percent of Ni. In addition, the DSC investigations revealed that the martensite start temperature (Ms) decreased by 50–60 °C compared to the predicted Ms reported in the literature. Surprisingly, the alloying additions as well as thermo-mechanical treatment achieved a tensile elongation up to 22%, and a tensile fracture stress up to 600 MPa. Moreover, the shape recovery ratio exceeded 97%.

形状记忆合金 (SMA) 在许多高级应用中至关重要，例如微机电系统 (MEMS)。因此，这项工作旨在研究热机械处理结合合金元素改性对提高 Cu-Al-Ni SMA 的机械性能和形状记忆效应 (SME) 的影响。在本研究中，样品分为两组：第一组在 900 °C 下进行 30 分钟的溶液处理。(ST)，另一组在 900°C 下热轧，然后在 900°C 下固溶处理 30 分钟。(HRST)。结果表明，试样的硬度随着Ni含量的增加而降低。此外，DSC 研究表明，与文献中预测的 Ms 相比，马氏体起始温度 (Ms) 降低了 50–60 °C。出奇，合金添加以及热机械处理实现了高达 22% 的拉伸伸长率和高达 600 MPa 的拉伸断裂应力。此外，形状恢复率超过97%。