【摘要】 系统研究纯锌和Zn-x Sr（x=0.1%,0.4%,0.8%,质量分数）合金热挤压后的显微组织、力学性能及体外降解行为。研究发现:添加0.1%Sr后合金中析出Sr Zn₁₃相,使挤压后合金的屈服强度、抗拉强度及伸长率由纯锌的（85.33±2.86）MPa、（106.00±1.41）MPa和（15.37±0.57）%分别提高到（107.67±2.05）MPa、（115.67±2.52）MPa和（20.80±2.19）%;继续增加Sr含量,由于析出粗大的Sr Zn₁₃相,容易引用应力集中和裂纹产生,使合金的性能下降。此外,分布不均匀的Sr Zn₁₃相与基体之间存在的微电偶腐蚀作用使得添加Sr后合金的体外降解速度加快,同时,降解变得不均匀。随着Sr含量的增加,降解速度逐渐加快,由纯锌的（11.45±2.02）mm/a逐渐增加至Zn-0.8Sr的（32.59±3.40）mm/a。其中,挤压态Zn-0.1Sr合金具有最佳的综合力学性能与降解性能。更多还原

【Abstract】 The microstructures,mechanical properties and in vitro degradation behavior of as-extruded pure Zn and Zn-x Sr（x=0.1,0.4,0.8 wt.%）alloys were investigated systematically.For the microstructure and mechanical properties,Sr Zn₁₃ phase was newly formed due to the addition of 0.1 wt.%Sr,improving the yield strength,ultimate tensile strength and elongation from（85.33±2.86）MPa,（106.00±1.41）MPa and（15.37±0.57）%for pure Zn to（107.67±2.05）MPa,（115.67±2.52）MPa and（20.80±2.19）%for Zn-0.1Sr,respectively.However,further increase of Sr content led to the deterioration of the mechanical properties due to the stress concentration and cracks initiation caused by the coarsening Sr Zn₁₃ particles during tensile tests.For in vitro degradation,since micro galvanic corrosion was enhanced owing to the formation of the inhomogeneously distributed Sr Zn₁₃ phase,the corrosion mode became non-uniform.Corrosion rate is gradually increased with the addition of Sr,which is increased from（11.45±2.02）μm/a（a=year）for pure Zn to（32.59±3.40）μm/a for Zn-0.8Sr.To sum up,the as-extruded Zn-0.1Sr alloy exhibited the best combination of mechanical properties and degradation behavior.更多还原