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

摘要:

本文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合金的屈服强度和拉伸强度逐渐增加，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。

Abstract:

In this paper, the microstructures and mechanical properties of extruded Mg-6xZn-xY alloys at the extrusion ratio of 81:1 are quantitatively investigated. The results show that I-phase content gradually increases, the average grain size of α -Mg matrix decreases first and then increases, with the increasing Zn, Y content. The α -Mg average grain size of Mg-6Zn-1Y alloy is minimum of 2.9 μm, and the size distribution is most uniform, the standard deviation of α -Mg grain size also reached the minimum of 0.77 μm. With increasing Zn, Y content, yield strength and tensile strength of Mg-Zn-Y alloy increase, and elongation decreases. Compare with α-Mg grain refinement, the content of fine I-phase increases significantly to improve the strength of Mg-6xZn-xY alloy.