Complex Precipitation Sequences of Al-Cu-Li-(Mg) Alloys Characterized in Relation to Thermal Ageing Processes
Zhen Gao, Jiang-Hua Chen†, Shi-Yun Duan, Xiu-Bo Yang, Cui-Lan Wu
Fig.11 <100>Al HAADF-STEM images showing the evolution of S-precipitates in the NA60 days sample aged at 200°C: a a S2-precipitate observed at 6 h, b a S4-precipitate observed at 28 h, c a large S-precipitate observed at 72 h, in which Li atoms segregate at its interfaces with the Al-matrix