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采用显微组织分析、硬度测试、拉伸测试、断口SEM分析等手段,研究了轧制温度对大应变轧制Al-Mg-Si-Cu合金板材显微组织及力学性能的影响。结果表明:合金经大应变轧制后组织呈纤维状,且组织中残留相出现破碎现象。随轧制温度升高,残留相破碎程度越大,且部分沿轧向呈链状分布,板材塑性增强。合金经固溶时效处理后析出均匀、细小而密集的强化相,且随轧制温度的升高,力学性能逐渐提高。合金经400℃热轧并热处理后其抗拉强度为350 MPa,伸长率为35.5%,断口呈韧性断裂特征,具有良好的综合力学性能。
The effects of rolling temperature on the microstructure and mechanical properties of Al-Mg-Si-Cu alloy sheet were investigated by means of microstructure analysis, hardness test, tensile test and fracture SEM analysis. The results show that the microstructure of the alloy is fibrous after the large strain rolling, and the residual phase in the microstructure is broken. With the increase of rolling temperature, the larger the degree of crushing of the residual phase, and the part of the chain along the rolling direction of distribution, plastic sheet enhanced. The alloy precipitates uniform, fine and dense reinforcing phases after solution treatment and aging treatment. With the increase of rolling temperature, the mechanical properties gradually increase. After hot rolling and heat treatment at 400 ℃, the tensile strength of the alloy is 350 MPa and the elongation is 35.5%. The fracture has ductile fracture characteristics and has good comprehensive mechanical properties.