(中北大学 材料科学与工程学院，太原 030051)
摘 要: 利用DSC、OM、SEM、EDS和力学性能测试研究Mg-11Gd-3.6Y-2Zn-0.6Zr(质量分数，%)合金的形变组织和变形态合金分别在T4、T5、T6处理下的组织和力学性能的变化。结果表明：T6处理对合金综合力学性能的改善更有利。T6处理时，随固溶温度的增加，合金的综合力学性能呈现先增大后减小的趋势，其中，在(430 ℃, 8 h)+(225 ℃, 16 h)时，抗拉、屈服强度和伸长率均表现良好，分别为397 MPa、300 MPa和12%，强度比挤压态分别提高了14.9%和28.8%，伸长率有所下降。T6处理的固溶温度过高时，尽管组织更加均匀，但是由于层片状和块状LPSO相的减少和晶粒长大，强度下降严重。
关键字: 变形镁合金；固溶温度；时效处理；显微组织；力学性能
（School of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract:The microstructure and mechanical properties of Mg-11Gd-3.6Y-2Zn-0.6Zr (mass fraction, %) magnesium alloy under the conditions of multi-directional forging, T4, T5, T6 treatment were investigated by DSC, OM, SEM, EDS and mechanical properties tests. The results show that T6 treatment is more beneficial to the improvement of comprehensive mechanical properties of the alloy. After T6 treatment, with the increase of solution temperature, the comprehensive mechanical properties of the alloy increase firstly and then decreases. And all of the ultimate tensile strength, yield strength and elongation performed well under T6(430 ℃, 8 h+225 ℃, 16 h) treatment reach 397 MPa, 300 MPa and 12%, respectively. The ultimate tensile strength and yield strength are increased by 14.9% and 28.8% compared with those of the as-forged alloy, respectively, and the elongation decrease. When the solution temperature of T6 treatment is too high, although the microstructure is more uniform, the strength decreases seriously due to the reduction of lamellar and the block-like LPSO phase, and the grain size increases.
Key words: wrought magnesium alloy; solution temperature; aging treatment; microstructure; mechanical properties
