The Influence of High Plastic Strain on Precipitation from Solid Solution in Third Generation Al-Li Alloys
Different levels of compression plane strain were applied to third generation aluminum alloys to simulate rolling-type deformation following solution heat treatment. The aluminum alloys utilized were extruded production samples provided by Alcoa in a solution heat treated condition (T4). The alloys included in this study are AA2099-T4 containing 1.78 wt% lithium, and AA2055-T4 containing 1.13 wt% lithium and an additional component of 0.45 wt% silver. Following plane strain compression, the samples were isothermally heat treated at 155 °C for times up to about 7 days. Data presented include hardening behavior values and various electron microscopy techniques using conventional TEM to document subsequent precipitate sequence distributions and general kinetics.
Knut Marthinsen, Bjørn Holmedal and Yanjun Li
W. A. Cassada and G. J. Shiflet, "The Influence of High Plastic Strain on Precipitation from Solid Solution in Third Generation Al-Li Alloys", Materials Science Forum, Vols. 794-796, pp. 1020-1025, 2014