ABSTRACT

Mechanical properties and corrosion resistance are important performance parameters for the application of biodegradable magnesium alloy. In this study, Mg-2Zn-0.5Nd alloy with different microstructures was achieved by solid solution treatment to study the effect of grain size and the second phase on its corrosion resistance and tensile properties. The results indicated that the corrosion resistance and elongation were significantly increased when the alloy was solution treated from 425 ℃ to 450 ℃, the lowest corrosion current density of 1.31 μA·cm^-2 was obtained when solution treated at 425 ℃. The optimal elongation was achieved at the solution treated temperature of 450 ℃, which was principally due to the influence of second phases dissolution. Moreover, it was also observed that the grain refinement appreciably improved ultimate tensile strength and corrosion resistance of the alloy, while the reduction of the second phase improved the elongation of the alloy.

摘要

机械性能和耐蚀性是生物可降解镁合金应用的重要性能参数。本研究通过固溶处理获得了具有不同组织的Mg-2Zn-0.5Nd合金，以研究晶粒尺寸和第二相对其耐蚀性和拉伸性能的影响。结果表明，从425℃至450℃固溶处理后，合金的耐蚀性和伸长率明显提高，最低腐蚀电流密度为1.31μA·cm ^-2。 425℃固溶处理后得到。固溶处理的最佳温度为450℃，这主要是由于第二相溶解的影响。此外，还观察到晶粒细化明显改善了合金的极限拉伸强度和耐腐蚀性，而第二相的减少改善了合金的伸长率。