论文部分内容阅读
本文利用透射电镜技术（ＴＥＭ），对１９０℃时效条件下，２０９０铝锂合金中主要脱溶相的组织特征以及相间的交互作用进行了分析研究。在对合金１９０℃时效特征研究基础上，着重探讨了合金的两个主要强化δ′（Ａｌ３Ｌｉ）和Ｔ１（Ａｌ２ＣｕＬｉ）相同以及Ｔ１相与亚晶界间的耦合作用。研究发现时效初期（３ｈ）δ′和Ｔ１相间的交互作用形式，具有不同于中、后期时效（１２ｈ和４８ｈ）的特征；亚晶界是Ｔ１相较集中的地方，而这又造成亚晶界附近的δ′无沉淀带（ＰＦＺ），本文分析探讨了Ｔ１相与亚晶界间的相互作用以及δ′ＰＦＺ出现的原因。
In this paper, the transmission electron microscopy (TEM) was used to analyze the microstructure and interphase interaction of the main de-dissolved phase in 2090 Al-Li alloy under 190 ℃ aging condition. Based on the study of the aging characteristics of the alloy at 190 ℃, the coupling between the two main strengthening δ ’(Al3Li) and T1 (Al2CuLi) and the T1 phase and the subgrain boundaries are emphatically discussed. It is found that the interaction between δ ’and T1 phase in the early aging (3h) is different from that in the middle and late phases (12h and 48h). The subgrain boundary is the place where T1 is concentrated, which in turn leads to subgrain In this paper, we discuss the interaction between T1 phase and subgrain and the reason of δ’PFZ.