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采用室温拉伸、电导率测试、金相及扫描电镜观察、晶间腐蚀分析手段,研究强化固溶对7050铝合金强度、电导率、微观组织和晶间腐蚀性能的影响。结果表明,经强化固溶处理后合金强度、电导率和腐蚀性能均超过单级固溶;提高强化固溶温度可促使粗大第二相大量回溶,且合金未出现过烧及晶粒明显长大现象,合金抗拉强度由546 MPa提高到572 MPa,拉伸断裂主要为韧窝断口,断口中粗大第二相粒子数量下降,使穿晶韧窝型断裂部分转向沿晶断裂。合金电导率稍许降低,抗晶间腐蚀性能显著提高。
The effects of strengthening solid solution on the strength, electrical conductivity, microstructure and intergranular corrosion resistance of 7050 aluminum alloy were studied by stretching at room temperature, electrical conductivity, metallographic and scanning electron microscopy, and intergranular corrosion analysis. The results show that the strength, electrical conductivity and corrosion resistance of the alloy after the strengthening solution treatment are all higher than that of the single-stage solution. Increasing the strengthening solution temperature can promote the large amount of second phase to dissolve, and the alloy has no over-burning and obvious grain growth The tensile strength of the alloy increases from 546 MPa to 572 MPa. The tensile fracture is mainly dimple fracture. The number of the coarse second phase particles in the fracture decreases, leading to the transgranular fracture of the transgranular dimple fracture. The conductivity of the alloy is slightly reduced, and the intergranular corrosion resistance is remarkably improved.