2195合金轧制板材的显微组织研究

采用金相、SEM和TEM并借助力学性能测试,对2195合金三种典型状态的轧制产品的显微组织与性能进行了分析。SEM及能谱分析发现,在所有状态的板材中,均存在粗大、不规则形状的Al 7 Cu 2Fe结晶相,所有的中间热处理工序均不能消除这种有害相。金相和TEM显示,热轧板的显微组织是以含细小多变化亚结构的纤维态组织为特征,冷轧板的显微组织则是以含高密度位错胞的扁平晶粒组织为特征。TEM观察表明,时效态产品中主要含弥散、片状T1（Al2 CuLi）相,并伴以少量片状（Al 2Cu）相;拉伸试验结果显示,近峰值时效的2195-T851薄板可获得理想的综合力学性能。本文结合生产条件对2195合金不同产品状态的显微组织的形成及其演变进行了讨论。

Microstructure Analysis of 2195 Al-Li Flat-rolled Plates and Sheets

In present study,the microstructure and mechanical properties of 2195 Al-Li alloy plates and sheets with three typical states were characterized by optical microscopy,SEM,TEM and mechanical test.Optical and TEM observations show that the microstructure of hot-rolled plate is characterized by a fibrous structure containing fine and polygonized substructures and that of cold-rolled sheet is characterized by a pan-caked grain structure containing high density dislocation cells.The results of tensile test show ...