双级时效对7085铝合金组织和性能的影响

发布时间：2019-04-28 07:30

【摘要】：采用硬度、电导率、力学拉伸、慢应变速率拉伸试验及透射电镜等测试分析方法,研究双级时效对7085铝合金组织和性能的影响。结果表明:预时效热处理主要析出相为GP区和η′相,预时效时间对合金硬度和电导率的影响较小。随着第二级时效时间的延长,合金的抗拉强度和屈服强度先增大后减小,电导率和抗应力腐蚀性能提高,晶界析出相由连续分布变为非连续分布。第二级时效温度越高,合金强度随时效时间的延长,降低得越显著。采用(110℃,6 h)+(160℃,12 h)双级时效热处理,合金的抗拉强度、屈服强度、伸长率及电导率分别为515MPa、487MPa、11.7%、38%(IACS)。
[Abstract]:The effects of two-stage aging on the microstructure and properties of 7085 aluminum alloy were studied by means of hardness, conductivity, mechanical tensile test, slow strain rate tensile test and transmission electron microscope (TEM). The results show that the main precipitates in pre-aging heat treatment are GP region and 畏 'phase, and the effect of pre-aging time on hardness and conductivity of the alloy is small. With the prolongation of the second-order aging time, the tensile strength and yield strength of the alloy first increase and then decrease, the conductivity and stress corrosion resistance of the alloy increase, and the grain boundary precipitates change from continuous distribution to discontinuous distribution. The higher the aging temperature of the second order is, the more obvious the strength of the alloy decreases with the prolongation of aging time. The tensile strength, yield strength, elongation and electrical conductivity of the alloy were 515 MPA, 487 MPA, 11.7%, 38% (IACS)., respectively, after two-stage aging treatment (110 鈩，

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