Speaker
Description
Al-Li based alloys of AA2195 type are designed mainly for aerospace applications. They
exhibit a very high strength due to a presence of strengthening precipitates of a nanometric
size. However, materials prepared by a conventional direct-chill casting and following rolling
exhibit strong crystallographic texture and inhomogeneous mechanical properties. This
inconvenient behavior could be suppressed by a direct twin-roll casting of the material to a
final gauge and subsequent precipitation annealing. Phase transformations occurring at
selected temperatures could be characterized using in-situ transmission electron microscopy
(TEM) annealing experiments. Nevertheless, the processes could be significantly influenced
by a constrained volume of thin foils used in TEM. A formation of platelike Li and Cu-rich non-
equilibrium precipitates was studied in materials annealed conventionally in a furnace and in-
situ in TEM.
