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采用拉伸试验、电导率及硬度测试以及组织观察(光学显微镜和扫描电镜)、能谱分析等方法,研究了双级固溶、双级时效热处理制度下第二级固溶处理温度对7A04铝合金组织和性能的影响。结果表明:随着第二级固溶温度的升高,合金力学性能呈现先上升后下降的趋势,晶粒尺寸不断长大,残余第二相不断减少;合金最佳第二级固溶处理温度为480℃,此时晶粒组织细小,合金的力学性能较好,抗拉强度、规定塑性延伸强度、硬度、伸长率和电导率分别为691 MPa、642 MPa、71 HRB、14.14%、32.16%IACS。
Tensile test, conductivity and hardness test and microstructure observation (optical microscopy and scanning electron microscopy), energy spectrum analysis and other methods to study the two-stage solution heat treatment, the second-stage solution heat treatment temperature of 7A04 aluminum Effect of Alloy Structure and Properties. The results show that with the increase of the second solution temperature, the mechanical properties of the alloy first increase and then decrease, the grain size continues to grow and the residual second phase decreases. The optimum second solution treatment temperature And the mechanical properties of the alloy were good. The tensile strength, the specified ductility, hardness, elongation and electrical conductivity were 691 MPa, 642 MPa, 71 HRB, 14.14%, 32.16 % IACS.