Summers Henry D, Ardakani Morteza S, Drelich Jaroslaw W
Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931, USA.
TMS 2023 152nd Annu Meet Exhib (2023). 2023;2023:278-287. doi: 10.1007/978-3-031-22524-6_26. Epub 2023 Feb 7.
A new series of zinc alloys is in development for bioresorbable stent implantation to alleviate the current materials' long-term complications. Characterization and optimization of the microstructure and corresponding mechanical properties during manufacturing stages will help researchers meet the required values. In this study, the effect of hot extrusion on the Zn-Ag-Mn-Cu-Zr-Ti alloy is characterized. Additionally, thermal treatments at 390 °C for 15, 25, 40, 60, and 120 min were performed to evaluate the effect of intermetallic phase fractions on the corrosion resistance and mechanical strength. Quantitative analysis of X-ray diffraction data demonstrates that the fractions of the MnZn, ZrZn, and ZnAgMn intermetallic phases decrease as the thermal treatment time increases. Corrosion tests reveal a reduction in the corrosion rate of the extruded alloy after thermal treatment. The results of uniaxial compression tests and tensile tests show lower strength and higher ductility in all heat-treated conditions compared with the as-extruded condition.
正在开发一系列新型锌合金用于生物可吸收支架植入，以缓解当前材料的长期并发症。在制造阶段对微观结构及相应力学性能进行表征和优化，将有助于研究人员达到所需值。在本研究中，对热挤压对Zn-Ag-Mn-Cu-Zr-Ti合金的影响进行了表征。此外，进行了在390°C下分别保温15、25、40、60和120分钟的热处理，以评估金属间相分数对耐腐蚀性和机械强度的影响。X射线衍射数据的定量分析表明，随着热处理时间的增加，MnZn、ZrZn和ZnAgMn金属间相的分数降低。腐蚀试验表明，热处理后挤压合金的腐蚀速率降低。单轴压缩试验和拉伸试验的结果表明，与挤压态相比，在所有热处理条件下强度较低而延展性较高。
