研究不同压力凝固条件下Mg82.13Zn13.85Y4.02(质量分数,％)合金微观组织和力学性能,发现合金的凝固组织是由α-Mg基体,W-Mg3Y2Zn3和I-Mg3YZn6相组成.其中,常压下凝固组织中的α-Mg枝晶间分布着由共晶组织形态和杆状第二相组成的网状结构.随着凝固压力的增大,共晶网逐渐断开,其数量逐渐减少,α-Mg基体中Zn的溶解度逐渐增大.常压凝固合金的室温压缩强度为344 MPa,屈服强度为331 MPa,相对压缩率为16％.6 GPa,1250℃凝固合金的室温压缩强度可达455MPa,屈服强度426MPa,相对压缩率为25％.常压凝固合金的压缩断裂模式为典型的解理断裂,且解理面大而光滑平整,高压凝固合金的压缩断口解理面较小,并出现撕裂岭和类似“撕裂韧窝”的形貌特征,解理断裂的程度有所降低.
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