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Al-Zn-Mg合金在同一温度下充分预时效后,采用三种不同温度进行最终时效,获得了最终时效性能曲线。当最终时效温度等于G.P区溶解温度时,合金具有良好的综合性能。通过电子显微镜观察,其主要强化相是细小的η’相和T’相,但T’相强化作用次于η’相;当最终时效温度低于G.P区溶解温度时,G.P区也起到一定的强化作用。随着最终时效温度升高和时效时间延长,析出相粗化,T’相增多,合金强度呈下降趋势。时效析出组织不是按G.P区→η’相→η相→T相而变化,而是η’相和T’相同时从G.P区中析出长大,即按G.p区→η’相和T’相→η相和T相而变化。
Al-Zn-Mg alloy at the same temperature fully pre-aging, the use of three different temperatures for the final aging, the final aging performance curve. When the final aging temperature is equal to G.P zone dissolution temperature, the alloy has good overall performance. The results showed that the main strengthening phase was small η ’phase and T’ phase by electron microscopy, but the T ’phase strengthening effect was inferior to η’ phase. When the final aging temperature was lower than the GP zone dissolution temperature, the GP zone also played a certain role The strengthening effect. With the increase of the final aging temperature and aging time, the precipitated phase coarsens and the T ’phase increases, and the strength of the alloy decreases. The precipitated tissue does not change according to the GP zone → η ’phase → η phase → T phase, but precipitates and grows from the GP zone when η’ phase and T ’are the same, ie, the Gp zone → the η’ phase and the T ’phase → η phase and T phase change.