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中文摘要：
通过组织观察（光学显微镜和扫描电镜）、力学性能检测、电导率测定，研究了单级固溶和双级固溶对7A55铝合金板材组织和力学性能的影响。结果表明：采用最佳单级固溶制度470℃／0．5h和120℃／24h时效处理，其力学性能σb，σ0.2和δ分别为635MPa，584MPa，和13．1％。与单级固溶处理制度相比，双级固溶处理在再结晶程度较小的情况下，能较大幅度的提高7A55铝合金板材的固溶度。采用双级固溶处理450℃／1．5h＋485℃／40min，120℃／24h时效后的力学性能有较大提升，其σb，σ0.2和δ分别达648MPa，630MPa和11．2％，较单级固溶其σ0.2强度提高了7．8％。
英文摘要：
The effects of single solution heat treatment and two-stage solution heat treatment on mierostrueture and mechanical properties of 7A55 aluminum alloy were investigated by means of optical microscopy and SEM, tensile test and electrical conductivity measurement. The optimal single solution heat treatment is 470℃/0.5h, which results in σb = 584MPa, σ0.2 = 635MPa and δ= 13.1% after aging of 120℃/24h. The two-stage solution heat treatment of 450℃/1 .Sh ＋ 485℃/40min improves dissolution of soluble constituents in the 7A55 aluminum alloy with small degree of recrystallization, and the mechanical properties σb = 648MPa,σ0.2 = 630MPa and δ = 11.2% are obtained,and the yield strength is about 7.8% higher than that obtained by single solution heat treatment.
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