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通过TEM分析和常规力学性能测试,研究双级时效工艺对2A97铝锂合金组织和性能的影响,以优化合金强度和塑性匹配。结果表明:随预时效温度升高,双级时效基体由形成θ′/θ″相和δ′相为主的组织转变为形成T1相、θ″/θ′和δ′相为主的组织。135℃预时效、双级时效基体形成大量细小的θ′/θ″相和δ′相,T1数量少。晶界和亚晶界T1数量多,尺寸小,晶界和亚晶界θ′/θ″无析出带宽度窄。155℃预时效、双级时效可在基体形成以T1相为主的组织,且数量多,尺寸大,均匀分布,T1相、θ″/θ′和δ′相的联合强化作用使合金具有高的强度。
The effects of two-stage aging process on the microstructure and properties of 2A97 Al-Li alloy were studied by TEM analysis and conventional mechanical tests to optimize the alloy strength and plasticity. The results show that with the increase of pre-aging temperature, the two-stage aged matrix is transformed into the structures mainly composed of T1 phase, θ “/ θ ’and δ’ phases by the formation of θ ’/ θ” phase and δ’ phase. 135 ℃ pre-aging, the formation of a large number of two-stage aging matrix A large number of small θ ’/ θ “phase and δ’ phase, a small number of T1 grain boundaries and subgrain boundaries T1 number, small size, grain boundaries and subgrain boundaries θ ’/ θ ”no precipitation width is narrow. 155 ℃ pre-aging, two-stage aging can be formed in the matrix T1-based organization, and the number of large, uniform size distribution, T1 phase, θ "/ θ ’and δ’ phase of the combination of strengthening the alloy has a high Strength of.