Al-Cu-Li-X合金早期时效过程组织和性能研究

Study on Microstructure and Properties of Al-Cu-Li-X Alloy During Early Aging Process

通过TEM和硬度测试等手段,研究了Al-Cu-Li-X合金早期时效过程中显微组织和力学性能的演变。结果表明:Al-Cu-Li-X合金淬火态显微组织主要为TMn相和δ'相,基体内分布有大量位错环和位错缠结。在165℃时效30 min后,δ'相部分溶解,GP区析出,位错发生回复,位错环和位错缠结密度降低。早期时效过程硬度出现回归现象。

The evolution of microstructure and mechanical properties of Al-Cu-Li-X alloy during early aging process were investigated through TEM and hardness testing. The results show that T_Mn and δ＇ phase are the main microstructure of quenched Al-Cu-Li-X alloy. A large number of dislocation loops and tangles distribute in the matrix. δ＇ phase starts to dissolve and GP zone precipitates. The density of recovered dislocation loops and tangles decrease after aging at 165℃ for 30 min. The hardness regression phenomenon is found in the early aging process.