论文部分内容阅读
采用光学显微镜、X射线衍射、差热分析和力学性能测试等,研究了铸态Mg-12Er-xZn-0.6Zr(x=0,0.6,1.8,摩尔分数,%)合金的显微组织和力学性能。结果表明,Mg-12Er-0.6Zr合金主要由α-Mg相组成,晶内出现成分偏析。添加0.6%的Zn后,合金晶粒明显细化,且出现X相(Mg12ErZn)。增加Zn含量至1.8%,合金晶粒大小和相组成未发生明显变化,而X相体积分数明显增加。添加Zn元素,显著提高了Mg-12Er-0.6Zr合金的屈服强度和抗压强度。随着Zn含量的增加,合金的伸长率呈下降趋势,但下降幅度较小。
The microstructure and mechanical properties of as-cast Mg-12Er-xZn-0.6Zr alloy (x = 0,0.6,1.8, mole fraction,%) were investigated by optical microscopy, X-ray diffraction, differential thermal analysis and mechanical properties tests. performance. The results show that the Mg-12Er-0.6Zr alloy mainly consists of α-Mg phases, and segregation of the grains occurs in the grains. After adding 0.6% Zn, the alloy grains are obviously refined, and the X phase (Mg12ErZn) appears. Increasing Zn content to 1.8%, the alloy grain size and phase composition did not change significantly, while the X-phase volume fraction increased significantly. Addition of Zn element significantly improves the yield strength and compressive strength of Mg-12Er-0.6Zr alloy. With the increase of Zn content, the elongation of the alloy shows a downward trend, but the decline is smaller.