Dy含量对Mg-Er-Zn合金显微组织与力学性能的影响

Effect of Dy Contents on the Microstructure Evolution and Mechanical Properties in Mg-Er-Zn Alloys

研究不同Dy元素含量对Mg_(96.6)Zn_(0.8)Er_(2.3)(at.%)合金的显微组织演变及其力学性能的影响.微观分析结果表明,铸态Mg_(96.6)Zn_(0.8)Er_(2.3)Dy_(0.3)和Mg_(96.3)Zn_(0.8)Er_(2.3)Dy_(0.6)合金均存在18R型长周期有序结构(LPSO)相.经均匀化处理后两合金既存在18R型LPSO相也存在14H型LPSO相.拉伸试验结果表明,挤压态Mg_(96.3)Zn_(0.8)Er_(2.3)Dy_(0.6)合金的抗拉强度、屈服强度与断裂延伸率均优于挤压态Mg_(96.6)Zn_(0.8)Er_(2.3)Dy_(0.3)合金.Mg_(96.3)Zn_(0.8)Er_(2.3)Dy_(0.6)合金的时效硬化强度均高于Mg_(96.6)Zn_(0.8)Er_(2.3)Dy_(0.3)合金.

The effect of Dy contents on the mechanical properties and microstructure evolution of Mg_(96.6)Zn_(0.8)Er_(2.3)(at.%)alloys were investigated.The results show that the LPSO phases in the two alloys are 18R-type in the as-cast state,and co-existence of 18R-and 14H-type after solution-treated.After hot-extruded,the tensile strength and aging microhardness of the Mg_(96.29)Zn 0.78 Er_(2.3)1 Dy_(0.62)alloy is better than the Mg_(96.59)Zn_(0.8)2 Er_(2.26)Dy_(0.33)alloy.