Zhuo Xiaoru, Huang Tiancheng, Xiong Yuhan, Zuo Pengpeng, Chen Xinyu, Jin Senlin
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China.
Technology Innovation Center of Graphene Metrology and Standardization, State Administration for Market Regulation, National Institute of Metrology (NIM), Beijing 100029, China.
Materials (Basel). 2025 Jun 12;18(12):2755. doi: 10.3390/ma18122755.
Zn-Ag alloys are deemed extremely promising materials for manufacturing biodegradable medical implants. Nonetheless, their practical applications are still constrained by inferior mechanical properties. To tackle this issue, Zn-0.5Ag alloy was alloyed with Mg (0.2 wt.%) and processed by combined equal-channel angular pressing (ECAP) and rolling, with different rolling reductions (40%, 60%, and 75%). ECAP-processed Zn-0.5Ag-0.2Mg alloy exhibited superior mechanical properties to its as-cast counterpart. Subsequent rolling of 40% further enhances the mechanical performance of ECAP-processed Zn-0.5Ag-0.2Mg alloy, with yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) reaching 255 MPa, 309 MPa, and 52%, respectively, surpassing the application requirements. As the rolling reduction increased to 60% and further to 75%, YS and UTS declined, whereas EL rose continuously. The underlying mechanisms for the variation in strength and ductility were elucidated based on microstructure evolution analysis through optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) characterizations.
锌银合金被认为是制造可生物降解医疗植入物的极有前景的材料。然而，它们的实际应用仍然受到较差机械性能的限制。为了解决这个问题，将锌-0.5银合金与镁（0.2重量%）合金化，并通过等通道转角挤压（ECAP）和轧制相结合的方法进行加工，轧制压下率分别为40%、60%和75%。经ECAP加工的锌-0.5银-0.2镁合金表现出比其铸态对应物更好的机械性能。随后40%的轧制进一步提高了经ECAP加工的锌-0.5银-0.2镁合金的机械性能，其屈服强度（YS）、抗拉强度（UTS）和伸长率（EL）分别达到255兆帕、309兆帕和52%，超过了应用要求。随着轧制压下率增加到60%并进一步增加到75%，YS和UTS下降，而EL持续上升。通过光学显微镜（OM）、扫描电子显微镜（SEM）和电子背散射衍射（EBSD）表征对微观结构演变进行分析，阐明了强度和延展性变化的潜在机制。
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