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采用常温拉伸、硬度测试、电导率测试、极化曲线、剥落腐蚀实验、金相显微镜和透射电镜等分析测试方法研究了三种时效制度(T6、T7、RRA)对Al-5.0Zn-3.0Mg-1.0Cu-0.1Zr铝合金组织和性能的影响。结果表明:T6和RRA态合金较T7态合金,其晶内析出细小弥散且体积分数较高的沉淀强化相η’相,因此强度与硬度更高;而T7和RRA态合金较T6态合金导电率更高,且其晶界析出粗大、不连续η相,其抗剥落腐蚀性能更优。RRA态合金在保持了较高强度与硬度的同时,也具有较高的抗剥落腐蚀能力。
The effects of three aging regimes (T6, T7, RRA) on Al-5.0Zn-3.0 were investigated by tensile test, hardness test, conductivity test, polarization curve, exfoliation corrosion test, metallographic microscope and transmission electron microscope. Effect of Mg-1.0Cu-0.1Zr Aluminum Alloy Structure and Properties. The results show that the strength and hardness of T6 and RRA alloys are higher than that of T7 alloys, and their precipitates are fine and dispersed with high volume fraction. Higher rate, and its grain boundary precipitated coarse, discontinuous η phase, its anti-stripping corrosion better. RRA alloy in the state to maintain a higher strength and hardness, but also has high resistance to stripping corrosion.