Mesoscopic Modeling of Primary Recrystallization of AA1050 with Curvature-Driven Interface Migration Effect

Primary recrystallization is an important phenomenon involved with cold deformation and heat treatment process. In the presentinvestigation, a two dimensional probabilistic cellular automata model is used to simulate primary recrystallization of cold rolled AA1050,commercially pure aluminum. Electron backscatter diffraction measurement data was used as an input for the simulation to consider highlyheterogeneous distribution of the stored energy and orientations compared to the randomly-distributed initial microstructure. Nucleation processwas assumed to be site-saturated. Once a nucleus is formed, its recrystallization front will sweep the deformed regions by dissipating the storeddeformation energy. In an attempt to contemplate anisotropic property of grain boundary migration, the grain boundary mobility was representedas a function of misorientation and the pressure was expressed as a function of dislocation density difference, curvature, and misorientation. Theresults of CA simulations were compared well with the JMAK theory in order to investigate the effects of nucleation criteria and curvature-driven pressure on the microstructure and the kinetics of primary recrystallization. This study revealed that local interface migration bycurvature-driven pressure could significantly affect the recrystallization kinetics and microstructure morphology depending on the nucleationcriteria. [doi:10.2320/matertrans.M2012267](Received July 31, 2012; Accepted October 10, 2012; Published December 25, 2012)Keywords: primary recrystallization, cellular automata, curvature-driven pressure, microstructure, kinetics