Shape memory alloys (SMAs) are considered as one of the most important smart materials for the future biomedical applications in consideration of the rapid world population aging. The promising Ti–Au–Cr–Ta alloys, which are good in biocompatibility, excellent in X–ray contrast, and high in corrosion resistance, were synthesized and evaluated in this study for realizing new biomedical materials. The specimens with the specific chemical composition of Ti–4Au–5Cr–5Ta (at.%) were chosen as the target material based on our preliminary findings. The Ti–4Au–5Cr–5Ta alloys were thereafter subjected to annealing–treatments at various annealing time periods for the manipulations of the phase constituents and microstructures. The fundamental mechanical properties and functionalities, such as shape deformation/recovery behaviors in the loading/unloading processes, were investigated. The two optimized specimens, which were subjected to a 1073 K annealing–treatment for 1.8 ks and 3.6 ks, performed good mechanical properties (i.e., strength and elongation) and excellent shape recovery rate of 96 % and 97 %, respectively. Via the systematic fine–tuning strategies, the Ti–4Au–5Cr–5Ta alloy with appropriate heat–treatment surpassed all other Ti–Au–Cr–Ta alloys, which were study by our research group.

考虑到世界人口迅速老龄化，形状记忆合金（SMA）被认为是未来生物医学应用中最重要的智能材料之一。本研究合成并评估了具有良好生物相容性、优异的 X 射线对比度和高耐腐蚀性的有前景的 Ti-Au-Cr-Ta 合金，以实现新的生物医学材料。根据我们的初步研究结果，选择具有特定化学成分 Ti-4Au-5Cr-5Ta (at.%) 的试样作为靶材。Ti-4Au-5Cr-5Ta 合金随后在不同的退火时间段进行退火处理，以控制相成分和微观结构。基本的机械性能和功能，研究了加载/卸载过程中的形状变形/恢复行为。两个优化后的试样经过 1073 K 退火处理 1.8 ks 和 3.6 ks，表现出良好的机械性能（即强度和伸长率）和出色的形状恢复率，分别为 96% 和 97%。通过系统的微调策略，经过适当热处理的 Ti-4Au-5Cr-5Ta 合金超过了我们研究组研究的所有其他 Ti-Au-Cr-Ta 合金。