A novel Zn-3Ag-0.5Mg alloy was plastically deformed using 3 processing paths: hot extrusion (HE), HE followed by cold rolling (CR) and high-pressure torsion (HPT). The processed samples consisted of the η-Zn phase, ε-Zn₃Ag precipitates within the matrix, and nanometric Zn₂Mg precipitates within the Zn₁₁Mg₂ phase located at the grain boundaries. Both the η-Zn phase and Mg-rich phases were enriched in Ag. Electron backscattered diffraction was used to examine the effects of grain size and texture on mechanical behavior with tensile tests performed at room temperature (RT) at different strain rates. The coarse-grained (~ 6 µm) samples after HE exhibited high strength with brittleness due to dislocation interaction with dispersed precipitates and, to some extent, with twinning activation. Significant grain refinement and processing at RT gave an increase in elongation to over 50 pct in CR and 120 pct in HPT. Ductile CR samples with an average grain size of ~ 2 µm and favorable rolling deformation texture gave a yield strength of ~ 254 MPa, a tensile strength of ~ 456 MPa, and a reasonable strain rate sensitivity. These values for the CR samples meet the mechanical requirements for biodegradable stents in cardiovascular applications.

一种新的Zn-3Ag-0.5Mg合金通过3种加工路径塑性变形：热挤压（HE），HE然后冷轧（CR）和高压扭转（HPT）。经处理的样品由所述的η -Zn相位，ε -Zn ₃的Ag的析出物在基体中，和纳米的Zn ₂中的Zn的Mg内析出物₁₁的Mg ₂位于晶界相。两个η -Zn相和富含Mg的相对于Ag富集。电子背散射衍射用于检查晶粒尺寸和织构对机械性能的影响，并在室温（RT）下以不同应变速率进行拉伸测试。粗粒度（〜6 µm）HE后的样品由于与分散的沉淀物发生位错相互作用，并在一定程度上具有孪生活化，因此显示出高强度和脆性。显着的晶粒细化和在RT处的加工使延伸率增加，CR超过50 pct，HPT增加120 pct。平均晶粒尺寸约为2 µm的延性CR样品，具有 良好的轧制变形织构，屈服强度约为254 MPa，拉伸强度约为456 MPa，应变率敏感性合理。CR样品的这些值符合心血管应用中可生物降解支架的机械要求。