挤压态Mg-Sn-Ca合金的显微组织、力学及生物腐蚀性能（英文）

Microstructure, mechanical and bio-corrosion properties of as-extruded Mg-Sn-Ca alloys

制备了用于骨科的挤压态Mg-Sn-Ca合金,并应用金相显微镜、扫描电子显微镜、X射线衍射仪、拉伸测试、浸泡测试和电化学测试等仪器和方法对其进行研究。结果表明:当锡添加量为1%,钙含量从0.2%增加到0.5%时,挤压态Mg-Sn-Ca合金的显微组织变得均匀,力学性能增加,耐腐蚀性提高。钙含量进一步增加到1.5%时,合金的强度增加,但伸长率和耐腐蚀性降低。在钙含量为0.5%的合金中,锡的含量从1%增加到3%时,合金的最大抗拉强度增加,耐腐蚀性降低。当锡含量为2%时,合金呈现最低的屈服强度和伸长率。挤压态Mg-Sn-Ca合金的这些行为受到Sn/Ca比率的控制。分析表明挤压态Mg-1Sn-0.5Ca合金有潜力作为可降解骨科植入体。

The as-extruded Mg？Sn？Ca alloys were prepared and investigated for orthopedic applications via using optical microscopy, scanning electron microscopy, X-ray diffraction, as well as tensile, immersion and electrochemical tests. The results showed that, with the addition of 1% Sn and the Ca content of 0.2%？0.5%, the microstructure of the as-extruded Mg？Sn？Ca alloys became homogenous, which led to increased mechanical properties and improved corrosion resistance. Further increase of Ca content up to 1.5% improved the strength, but deteriorated the ductility and corrosion resistance. For the alloy containing 0.5% Ca, when the Sn content increased from 1% to 3%, the ultimate tensile strength increased with a decreased corrosion resistance, and the lowest yield strength and ductility appeared with the Sn content of 2%. These behaviors were determined by Sn/Ca mass ratio. The analyses showed that as-extruded Mg？1Sn？0.5Ca alloy was promising as a biodegradable orthopedic implant.