EFFECT OF RECRYSTALLIZATION TEMPERATURE ON MICROSTRUCTURES AND SUPERPLASTICITY OF 2091 Al-Li ALLOY

摘要

The grain boundary character distribution and the texture of 2091 Al-Li alloy recrystallized at different temperatures were measured by TEM and X-ray techniques respectively. The occurrence frequencies of both the low-angle boundaries and the low Σ coincidence boundaries decreased with increasing recrystallization temperature, while the frequency of the random boundaries increased. The effect of the grain boundary structure on the behavior of superplastic deformation was discussed. The main conclusion is that the superplastic deformation temperature can be lowered by lowering the recrystallization temperature.