铜和锶对可生物降解锌合金显微组织和力学性能的影响

Influence of Copper and Strontium on Microstructure and Mechanical Properties of Biodegradable Zinc Alloys

制备了不同铜、锶含量的可生物降解锌合金,对其分别进行了340℃保温4、6和8 h的均匀化处理,研究了铜和锶元素以及均匀化处理时间对合金组织和力学性能的影响。结果表明:随着铜质量分数从1%增加到3%,合金中ε相的数量增加,其平均尺寸从6.96μm增大至10.92μm,合金的抗拉强度首先从102.1 MPa上升至129.4 MPa,随后下降至126.8 MPa;随着锶质量分数从0.10%提高到0.15%,合金中SrZn相的数量增加,其平均尺寸从13.48μm增大至15.63μm,合金的抗拉强度从112.6 MPa提高到129.4 MPa,断后伸长率从1.23%下降至1.03%;均匀化处理时间越长,合金晶粒越粗大,ε相数量越少,合金力学性能下降。

Biodegradable zinc alloys with different cooper and strontium contents were prepared, and homogenized at 340 ℃ for 4, 6, and 8 h, respectively. The effects of copper and strontium elements and homogenizing time on the microstructure and mechanical properties of the alloys were investigated. The results showed that(a) as copper content in the alloy increased from 1% to 3% by mass(the same below), the number of ε phase increased and their average size increased from 6.96 to 10.92 μm, and the tensile strength of the alloy increased from 102.1 to 129.4 MPa at first and then decreased to 126.8 MPa;and(b) as strontium content in the alloy increased from 0.10% to 0.15%, the number of SrZnphases increased and their average size increased from 13.48 to 15.63 μm, and the tensile strength of the alloy increased from 112.6 to 129.4 MPa and the elongation decreased from 1.23% to 1.03%. The longer the homogenizing time, the coarser the grain of the alloy was, the less the amount of ε phase was, and the lower the mechanical properties of the alloy were.