MODELING THE MICROSTRUCTURAL CHANGES DURING HOT TANDEM ROLLING OF AA5XXX ALUMINUM-ALLOYS - PART II - TEXTURAL EVOLUTION

In Part II of this article, the experimental work undertaken to measur e the effect of deformation parameters (temperature, strain, and strai n rate) on the texture formation during hot deformation and the evolut ion during subsequent recrystallization is described. In addition, the isothermal kinetics of development of individual texture components w ere also determined. A neutron diffractometer was used to measure the texture in the as-hot-deformed aluminum samples, and the samples were then heat treated in a 400 degrees C salt bath for various lengths of time, with the texture being remeasured at various stages in the recry stallization process. Using data from the experimental program, the te xture evolution during recrystallization was modeled by applying a mod ified form of the Avrami equation. Results indicated that, of the defo rmation parameters studied, textural development was most sensitive to the deformation temperature for both alloys. In addition, modeling re sults revealed that the Cu component ({112}< 111 >) was the first to r ecrystallize, typically followed by the S ({123}< 634 >) and Bs ({110} < 112 >) components. This is in agreement with earlier work which indi cated that the Bs component was the hardest to recrystallize, possibly because it is able to deform on very few slip systems and, hence, the dislocation interaction may be low.