Modeling the variation in recrystallized fraction through the thickness of AA7050 plate.

The change in the recrystd. fraction through the thickness of AA7050 hot rolled plate was investigated and the factors that contribute to this local variation were analyzed. The stored energy due to hot rolling, which provides the driving force for recrystn., was detd. through the plate thickness from measurements of the subgrain size and misorientation made using electron backscattered diffraction (EBSD). The no. d. of large intermetallic particles capable of stimulating the nucleation of recrystd. grains (PSN) was measured at the same positions. These measurements, coupled with a model for the Al3Zr dispersoid distribution and recrystn., were used to predict the variation in the through thickness recrystd. fraction. The observation that the recrystd. fraction is greatest at the center and surface and least close to the T/4 position is reproduced well by the model. [on SciFinder (R)]