研究了在350℃不同挤压比(16、32)下的Mg-6xZn-xY(x=0.5,0.75,1)合金微观组织和室温力学性能.结果表明,当挤压比为32时,合金中第二相体积百分含量较多,平均晶粒尺寸较小.其中,Mg-6Zn-1Y合金在挤压比为16时,α-Mg基体平均晶粒尺寸为14.6 μm,抗拉强度及屈服强度分别为264MPa和169MPa;当挤压比为32时,α-Mg基体平均晶粒尺寸为5.9 μm,抗拉强度和屈服强度达到337 MPa和237 MPa,分别提高了27.7％和40.3％.另外,所有合金经热挤压后都有良好的塑性,室温拉伸断口均呈韧性断裂特征.
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