Ce含量对Mg-2Zn-0.4Zr-xCe生物镁合金组织及耐蚀性的影响

Effects of Ce on microstructure and properties of Mg-2Zn-0.4Zr-xCe biomedical magnesium alloys

研究了不同Ce含量对Mg-2Zn-0.4Zr-x Ce生物镁合金组织及耐蚀性的影响。通过拉伸试验、电化学测试、SEM分析等手段对合金的力学性能、耐蚀性及显微组织进行了研究。结果表明:当Ce含量在低于1 mass%的范围内,随着Ce含量的增加,第二相沿着晶界析出并且逐渐增多,晶粒细化,力学性能和耐蚀性逐渐提高;Ce含量为0.6 mass%时,合金的力学性能与耐蚀性较佳,抗拉强度约为140.13 MPa,伸长率约为9.47%,腐蚀速率约为0.776 mg·cm^(-2)·d^(-1);当Ce含量大于0.6 mass%时,腐蚀速率有增大的趋势,力学性能变化不明显。

Effects of contents of Ce on microstructure and corrosion resistance of Mg-2Zn-0.4Zr-xCe biomedical magnesium alloys were studied.The mechanical properties,corrosion resistance and microstructure of the alloy were investigated by means of tensile test,electrochemical measure and SEM.The results show that when the contents of Ce is below 1 mass%,the second phase precipitates along grain boundaries,quantity of precipitation increases and grains are refined,the mechanical properties and corrosion resistance of the alloy are improved gradually.When the content of Ce is 0.6 mass%,the mechanical properties and corrosion resistance of the alloy are optimized,the tensile strength of the alloy is about 140.13 MPa,the elongation is about 9.47%,the average corrosion rate is approximately0.776 mg·cm^-2·d^-1.When the content of Ce is more than 0.6 mass%,the corrosion rate tends to increase,and the change of mechanical properties is not obvious.