2007•Cailiao rechuli xuebaoRequires access
Effect of solution treatment on microstructure and mechanical properties of 7A55 aluminum alloy
Hui Gao
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Abstract
The effects of single solution heat treatment and two-stage solution heat treatment on microstructure 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 σ_b=584MPa,σ_(0.2)=635MPa and δ=13.1% after aging of 120℃/24h.The two-stage solution heat treatment of 450℃/1.5h+485℃/40min improves dissolution of soluble constituents in the 7A55 aluminum alloy with small degree of recrystallization,and the mechanical properties σ_b=648MPa、σ_(0.2)=630MPa and δ=11.2% are obtained,and the yield strength is about 7.8% higher than that obtained by single solution heat treatment.