A bamboo-like grain structure was obtained in melt-extraction Au₇Cu₅Al₄ microwires via cyclic heat treatment. The superelasticity and two-way shape memory properties were investigated by performing uniaxial cyclic tensile tests and mechanically constrained thermal cycling, respectively. The superelasticity of bamboo-grained microwires was improved significantly duo to a reduction in the constraints caused by triple junctions. A recoverable strain of ∼3% was achieved over a wide temperature range of 358–423 K for the bamboo-grained microwire, which exhibited excellent cyclic stability under a stress of up to 470 MPa. The two-way shape memory properties were determined by conducting load-biased thermal cycling tests, and a recoverable strain of 1.2% with a maximum work output of 1.2 J cm⁻³ was achieved under a stress of 100 MPa. The results indicate that the Au–Cu–Al shape memory alloy is a potential candidate for small-sized actuators operating in harsh environments.

_{熔融提取Au 7} Cu ₅ Al ₄获得竹状晶粒结构微丝通过循环热处理。通过分别进行单轴循环拉伸试验和机械约束热循环来研究超弹性和双向形状记忆特性。由于减少了由三重连接引起的约束，竹粒微线的超弹性得到了显着改善。竹纹微丝在 358-423 K 的宽温度范围内实现了 3% 的可恢复应变，在高达 470 MPa 的应力下表现出优异的循环稳定性。双向形状记忆特性通过负载偏置热循环测试确定，可恢复应变为 1.2%，最大功输出为 1.2 J cm ^-3在 100 MPa 的应力下实现。结果表明，Au-Cu-Al 形状记忆合金是在恶劣环境下运行的小型执行器的潜在候选者。