Recent advances in modeling of grain fragmentation during deformation of polycrystalline metals using viscoplastic self-consistent (VPSC) polycrystal plasticity are combined into a field fluctuations VPSC (FF-VPSC) model and extended to model recrystallization. The model is a higher-order formulation calculating the second moments of lattice rotation rates based on the second moments of stress fields inside grains and resulting intragranular misorientation distributions. Formation of a copper-like texture in a moderately high stacking fault energy (SFE) Cu and a brass-like texture in low SFE brass during rolling and subsequent recrystallized textures are successfully predicted using the model. Similar formulations are implemented into delta elasto viscoplastic self-consistent (ΔEVPSC) formulation with the goal of predicting an extensive in-situ neutron diffraction dataset of deformation, recovery, and recrystallization behavior in pure Ta. The FF-VPSC model is also extended to account for field fluctuations of twinned grains in hexagonal metals and applied to model recrystallization behavior of AZ31 and WE43. Finally, a mean-field strain-gradient plasticity model is proposed which uses intragranular misorientation spread to model strain-gradient effect by calculating geometrically necessary dislocations (GNDs).

Microsoft Teams meeting 
Join on your computer, mobile app, or room device. 
Click here to join the meeting
Meeting ID: 269 102 443 637
Passcode: uraxFD