固溶、时效对7003铝合金组织与性能的影响

Effect of Solution and Aging on Microstructure and Properties of 7003 Aluminum Alloy

文摘通过显微硬度测试、力学性能测试、SEM观察以及EDS分析等手段对不同热处理制度下的7003合金的组织与性能进行了系统的研究。结果表明:时效前,随着固溶温度的提高,合金的显微硬度和强度不断降低,而塑性则不断提高;随着固溶时间的延长,强度和硬度先降低后增大,塑性则先降低后提高。经过120℃/50 h人工时效和60 d自然时效后,合金的力学性能明显高于时效前,且470℃/70 min固溶的综合力学性能最好(σ0.2=302 MPa,σb=363 MPa,δ=12.5%)。7003合金的优化固溶处理制度是470℃/70 min。

The microstructure and properties of 7003 alloy with different heat treating regimes were investigated by means of microhardness tester, electronic tensile machine, scanning electron microscopy （SEM） and energy dispersive X- ray spectrometer （EDS）. The results show that the microhardness and strength decrease and the ductility increases with increasing the solution temperature; the microhardness and strength decrease and then increase while the ductility increases and then decreases, with solution time rising. The strength and microhardness of 7003 alloy after artificial aging and natural aging are evidently higher than those before aging, and the samples solutioned at 470℃ for 70 min possess the best mechanical properties （σ0.2 =302 MPa,σb =363 MPa,δ = 12.5% ）. The optimum solution treatment process of the alloy is 470℃ for 70 min.