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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 microstructure and mechanical properties of Mg-6xZn-xY alloy under large extrusion ratio (81: 1) were quantitatively studied. The results show that the content of quasicrystalline phase increases with the increase of Zn and Y content, the average grain size of α-Mg matrix decreases first and then increases, and the average grain size of α-Mg in Mg-6Zn-1Y alloy is the smallest 2.9μm, and the size distribution of the most uniform, and its standard deviation is also the smallest, 0.77μm. With the increase of Zn and Y content, the yield strength and tensile strength of Mg-Zn-Y alloy gradually increase, while the elongation decreases. Compared with the grain refinement of α-Mg matrix, the increase of the content of fine quasicrystalline phase is more obvious for improving the strength of Mg-6xZn-xY alloy.