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本文研究了一种新的热处理工艺——回复再时效(RRA)处理对国产 Al—Zn—Mg—Cu 系 LC9铝合金力学性能和显微组织的影响.结果表明,合金在 T6状态下经220℃5min 加热回复及120℃24h 再时效处理后,在室温拉伸性能不低于 T6状态的同时,获得了高于 T73状态的应力腐蚀抗力.而相应的组织变化则表现为晶粒内部形成大小两种不同尺度范围的沉淀相,使合金具有较高的强度;同时,晶界沉淀物的端部由尖锐变得圆钝,晶界临近区域中的合金元素贫化,使材料的应力腐蚀抗力提高.
In this paper, the effect of a new heat treatment process, Re-AEW (RRA) on the mechanical properties and microstructure of domestic Al-Zn-Mg-Cu based LC9 aluminum alloys was investigated. ℃ 5min heating recovery and 120 ℃ 24h re-aging treatment, at room temperature tensile properties of not less than T6 state at the same time, higher than the T73 stress corrosion resistance obtained while the corresponding changes in the organization showed the grain size Two different scales range of precipitation phase, the alloy has high strength; the same time, the grain boundary precipitates become blunt and blunt, the grain boundary in the vicinity of the alloy element depletion, the material’s stress corrosion resistance improve.