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研究了时效工艺对往复挤压Mg-5Sn-1.5Al-1Zn-1Si合金显微组织和力学性能的影响,并分析了时效处理的作用机制。结果表明:合金时效处理后晶粒尺寸略有增大,晶粒分布不均匀,晶粒直径10μm左右;晶界处的块状颗粒相部分溶解,在晶界或晶内析出1μm左右的二次颗粒相。时效后Mg-5Sn-1.5A1-1Zn-1Si合金的伸长率呈下降趋势,而抗拉强度、屈服强度和硬度大幅度升高,其中抗拉强度和屈服强度高达323 MPa和272 MPa。
The effects of aging process on the microstructure and mechanical properties of reciprocating extrusion Mg-5Sn-1.5Al-1Zn-1Si alloy were studied. The mechanism of aging treatment was also analyzed. The results show that after the aging treatment, the grain size increases slightly and the grain size is not uniform, and the grain size is about 10μm. The massive grain phase is partially dissolved in the grain boundary, Particle phase. After aging, the elongation of Mg-5Sn-1.5A1-1Zn-1Si alloy showed a downward trend, while the tensile strength, yield strength and hardness increased significantly, of which the tensile strength and yield strength were as high as 323 MPa and 272 MPa.