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.5 Diameter distributions of GPI zones and δ′-GPI-δ′ composite precipitates observed a in the sample natural aged for 60 days, and b in the sample first natural aged for 60 days and then artificial-aged at 180°C for 0.5 h