An Ultra‐Low Modulus of Ductile TiZrHfTa Biomedical High‐Entropy Alloys through Deformation Induced Martensitic Transformation/Twinning/Amorphization

作者：Bingnan Qian, Xiaoqing Li, Yu Wang, Junhua Hou, Jikui Liu, Sihao Zou, Fengchao An, Wenjun Lu · 发表于：Advanced Materials · 年份：2024 · DOI：10.1002/adma.202310926 · 被引用次数：53 · 研究领域：High Entropy Alloys Studies、Titanium Alloys Microstructure and Properties、Advanced materials and composites

Biomedical alloys are paramount materials in biomedical applications, particularly in crafting biological artificial replacements. In traditional biomedical alloys, a significant challenge is simultaneously achieving an ultra-low Young's modulus, excellent biocompatibility, and acceptable ductility. A multi-component body-centered cubic (BCC) biomedical high-entropy alloy (Bio-HEA), which is composed of non-toxic elements, is noteworthy for its outstanding biocompatibility and compositional tuning capabilities. Nevertheless, the aforementioned challenges still remain. Here, a method to achieve a single phase with the lowest Young's modulus among the constituent phases by precisely tuning the stability of the BCC phase in the Bio-HEA, is proposed. The subtle tuning of the BCC phase stability also enables the induction of stress-induced martensite transformation with extremely low trigger stress. The transformation-induced plasticity and work hardening capacity are achieved via the stress-induced martensite transformation. Additionally, the hierarchical stress-induced martensite twin structure and crystalline-to-amorphous phase transformation provide robust toughening mechanisms in the Bio-HEA. The cytotoxicity test confirms that this Bio-HEA exhibits excellent biocompatibility without cytotoxicity. In conclusion, this study provides new insights into the development of biomedical alloys with a combination of ultra-low Young's modulus, excellent biocompatibility, and decent duc...