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采用显微组织分析、硬度测试、拉伸测试、SEM断口分析等手段,研究了热处理工艺对大应变轧制Al-Mg-Si-Cu合金板材显微组织及力学性能的影响。研究表明:轧制态Al-Mg-Si-Cu合金中轧制面组织呈纤维状且存在大量残留相。合金经固溶后显微组织中残留相基本溶解,晶粒得到小幅度长大,在时效处理后强化相均匀析出,使得合金得到强化效果。合金经510℃/80 min固溶和195℃/13 h时效热处理后,测试硬度值为127.1 HV,抗拉强度为410 MPa,伸长率达24.8%,断口分析为韧性断裂,合金表现出良好的力学性能。
The effects of heat treatment on the microstructure and mechanical properties of Al-Mg-Si-Cu alloy sheet were studied by means of microstructure analysis, hardness test, tensile test and SEM fracture analysis. The results show that the rolling microstructure of the rolled Al-Mg-Si-Cu alloy is fibrous with a large amount of residual phase. After the solid solution alloy microstructure residual phase is basically dissolved, the grain grew up slightly, strengthening the phase after aging treatment even precipitation, making the alloy to be enhanced. After the alloy was solution-treated at 510 ℃ for 80 min and aged at 195 ℃ for 13 h, the hardness of the alloy was 127.1 HV, the tensile strength was 410 MPa and the elongation was 24.8%. The fracture analysis showed ductile fracture and the alloy showed good performance The mechanical properties.