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研究了单级固溶和双级固溶热处理工艺对喷射成形Al-Zn-Mg-Cu铝合金力学性能的影响.应用光学显微镜、扫描电镜与透射电镜对显微组织和第二相颗粒的固溶及沉淀析出状况做了进一步的研究.结果表明:双级固溶时效和单级固溶时效处理制度相比,前者得到的组织和力学性能较为理想;双级固溶处理综合了低温单级固溶和高温单级固溶的优点,即再结晶晶粒尺寸较小,同时回溶颗粒较多.时效后的组织也较理想.采用双级固溶处理(450℃/3h+480℃/3h)和T6时效处理后,合金的抗拉强度和屈服强度分别达到806MPa和797MPa,延伸率达到7.5％.
The effects of single-stage solid solution and two-stage solution heat treatment on the mechanical properties of Al-Zn-Mg-Cu aluminum alloy spray-formed were studied. The microstructure and solidification of the second phase particles were observed by optical microscope, scanning electron microscope and transmission electron microscope The results show that the two-stage solution treatment has better microstructure and mechanical properties than single-stage solution treatment and aging treatment. The two-stage solution treatment combines low temperature single stage The advantages of solid solution and high temperature single-stage solution are that the size of recrystallized grains is small, and the number of particles is larger and the microstructure is better after aging. 3h) and T6 aging treatment, the tensile strength and yield strength of the alloy reached 806MPa and 797MPa respectively, and the elongation reached 7.5%.