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Fine-tuning of mechanical properties in a Zn–Ag–Mg alloy via cold plastic deformation process and post-deformation annealing

机译：通过冷塑形变形工艺和变形后退火的Zn-Ag-Mg合金中机械性能微调

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摘要

In recent years, Zn-based materials have been extensively investigated as potential candidates for biodegradable implant applications. The introduction of alloying elements providing solid-solution strengthening and second phase strengthening seems crucial to provide a suitable platform for the thermo-mechanical strengthening of Zn alloys. In this study, a systematic investigation of the microstructure, crystallographic texture, phase composition, and mechanical properties of a Zn–3Ag-0.5Mg (wt%) alloy processed through combined hot extrusion (HE) and cold rolling (CR), followed by short-time heat treatment (CR + HT) at 200 °C was conducted. Besides, the influence of different annealing temperatures on the microstructure and mechanical properties was studied. An adequate combination of processing conditions during CR and HT successfully addressed brittleness obtained in the high-strength HE Zn–3Ag-0.5Mg alloy. By controlling the microstructure, the most promising results were obtained in the sample subjected to 50% CR reduction and 5-min annealing, which were: ultimate tensile strength of 432 MPa, yield strength of 385 MPa, total elongation to failure of 34%, and Vickers microhardness of 125 HV0.3. The obtained properties clearly exceed the mechanical benchmarks for biodegradable implant materials. Based on the conducted investigation, brittle multi-phase Zn alloys' mechanical performance can be substantially enhanced to provide sufficient plasticity by grain refinement through cold deformation process, followed by short-time annealing to restore proper strength.
机译：近年来，基于Zn的材料被广泛调查为可生物降解植入应用的潜在候选者。提供固溶强化和第二相强化的合金元件的引入至关重要，为Zn合金的热机械强化提供合适的平台。在本研究中，通过组合的热挤出（HE）和冷轧（CR）处理Zn-3Ag-0.5mg（wt％）合金的微观结构，晶体纹理，相组合物和机械性能的系统研究，然后进行进行200℃的短时间热处理（Cr + HT）。此外，研究了不同退火温度对微观结构和机械性能的影响。在Cr和HT期间的加工条件的适当组合成功地解决了在高强度He Zn-3Ag-0.5mg合金中获得的脆性。通过控制微观结构，在样品中获得最有前景的结果，在50％Cr还原和5分钟退火的样品中获得，即：极限拉伸强度为432MPa，屈服强度为385MPa，总伸长率为34％，和维氏微硬度为125 HV0.3。所获得的性质明显超过可生物降解的植入材料的机械基准。基于进行的研究，脆性多相Zn合金的机械性能可以基本上提高，通过冷变形过程通过晶粒细化提供足够的可塑性，然后进行短时退火以恢复适当的强度。

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