挤压Mg-6xZn-xY合金微观组织与力学性能  

Microstructures and Mechanical Properties of Extruded Mg-6xZn-xY Alloys

作　　者：李彬[1] 张英波[1] 孙兵[1] 权高峰[1] 

机构地区：[1]西南交通大学,四川成都610031

出　　处：《稀有金属材料与工程》2016年第3期640-643,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51201142);四川省科技计划项目(2014JY0020)

摘　　要：定量研究了大挤压比(81:1)条件下Mg-6xZn-xY合金的微观组织和力学性能。结果表明:随着Zn、Y含量的增加,准晶相含量逐渐增加,α-Mg基体平均晶粒尺寸先减小后增大,Mg-6Zn-1Y合金中的α-Mg平均晶粒尺寸最小为2.9μm,且尺寸分布最均匀,其标准差也达到最小,为0.77μm。随着Zn、Y含量的增加,Mg-Zn-Y合金的屈服强度和抗拉强度逐渐增大,延伸率逐渐降低。相比于α-Mg基体晶粒细化,细小准晶相含量的增加对提高Mg-6xZn-xY合金强度的作用更明显。The microstructures and mechanical properties of extruded Mg-6xZn-xY alloys at the extrusion ratio of 81：1 were quantitatively investigated.The results show that with the content of Zn and Y increasing,I-phase content gradually increases,while the average grain size of α-Mg matrix decreases first and then increases.The minimum average grain size of α-Mg in Mg-6Zn-1Y alloy is 2.9 μm,the size distribution is most uniform,and the standard deviation of α-Mg grain size also reaches the minimum of 0.77 μm.With increasing the content of Zn and Y,the yield strength and the tensile strength of Mg-Zn-Y alloy increase,while the elongation decreases.The content increment of fine I-phase improves the strength of Mg-6xZn-xY alloy more obviously than α-Mg grain refinement.

关 键 词：准晶相 MG-ZN-Y合金 挤压比 微观组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]