稀土元素Y和Nd对ZK60合金组织与性能的影响

Effect of Rare Earth Element Y and Nd on Structure and Performance of ZK60 Alloy

以ZK60变形镁合金为基础添加稀土元素Y和Nd,获得了化学成分(质量分数)分别为Mg-5.5Zn-0.7Zr-0.4Y-0.4Nd,Mg-5.5Zn-0.7Zr-0.5Y-0.5Nd和Mg-5.5Zn-0.7Zr-0.6Y-0.6Nd的镁合金。采用金相显微镜、扫描电镜和X射线衍射仪等观察了ZK60合金和ZK60RE合金的铸态、均匀化以及轧制态的显微组织。结果表明,稀土元素Y和Nd混合添加能够细化ZK60合金的铸态、均匀化以及轧制态组织,并且可以明显提高其室温断裂强度,在该文试验范围内,随着稀土元素含量的增加室温断裂强度增加,其中化学成分为Mg-5.5Zn-0.7Zr-0.5Y-0.5Nd和Mg-5.5Zn-0.7Zr-0.6Y-0.6Nd的合金比未添加稀土元素的ZK60合金室温断裂强度分别提高了20.09%和20.56%。

Rare earth elements Y and Nd were added in ZK60 wrought magnesium alloy and a new magnesium al- loy with chemical components （ mass fraction） ofmg - 5. 5Zn - O. 7Zr - 0. 4Y - 0. 4Nd, Mg - 5.5Zn - 0. 7Zr - 0. 5Y -0. 5Nd andmg -5.5Zn -0. 7Zr -0. 6Y -0. 6Nd was obtained. The cast condition, homogenization and rolling microscopic structure of ZK60 alloy and ZK60RE alloy were observed by metallographic microscope, scanning electron microscope and X - ray diffractometer. The results show that the adding of rare earth elements Y and Nd makes the cast condition, homogenization and rolling structure finer and promotes the breaking strength at room temperature greatly. Within the test range, the breaking strength at room temperature increases as a function of the content of rare earth elements. The breaking strength of alloys with chemical components of Mg -5.5Zn - 0. 7Zr- 0. 5Y -0. 5Nd and Mg -5. 5Zn -0. 7Zr -0. 6Y -0. 6Nd at room temperature increases by 20. 09 % and 20. 56 % respectively after adding rare earth elements.