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采用拉伸、硬度、电导率测试和透射电镜分析等方法研究了不同回归处理工艺对Al-Zn-Mg-Cu合金型材组织与性能的影响。结果表明,采用120℃×24 h+180℃×45 min+120℃×24 h回归再时效处理后,合金的抗拉强度、屈服强度、伸长率和电导率分别为613.5 MPa、599 MPa、11.1%和39.2%IASC。与T6态相比,合金在抗拉强度和伸长率相当的情况下,屈服强度和电导率显著提高,合金的抗应力腐蚀性能明显改善。合金晶内为细小的η’相和η相,晶界沉淀相断续分布,伴有较窄的晶界无析出带。
The effects of different regressive treatments on the microstructure and properties of Al-Zn-Mg-Cu alloy profiles were investigated by tensile test, hardness test, conductivity test and transmission electron microscopy. The results showed that the tensile strength, yield strength, elongation and electrical conductivity of the alloy were 613.5 MPa and 599 MPa, respectively, after being re-aged by 120 ℃ × 24 h + 180 ℃ × 45 min + 120 ℃ × 24 h. 11.1% and 39.2% IASC. Compared with the T6 state, the tensile strength and elongation of the alloy case, the yield strength and electrical conductivity significantly increased, the alloy’s stress corrosion resistance improved significantly. The alloy has fine η ’phase and η phase, and the grain boundary precipitates are discontinuously distributed with a narrower grain boundary precipitation band.