|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Effect of Loading Path on Grain Misorientation Evolution in Polycrystalline Al under Large Deformation
||Wenkai Fu, Yulan Li, Shenyang Hu, Peter Sushko, Suveen Mathaudhu
|On-Site Speaker (Planned)
Predictive understanding of microstructure evolution during solid phase processing is crucial to optimize loading path that affects grain misorientation for desired material microstructures and properties. In this work, the crystal plasticity theory is employed to investigate inhomogeneous and anisotropic deformation in polycrystalline aluminium under linear reciprocating tribometric loads. Several tribometric loading paths with shear deformation gradient up to 30% were studied. The dislocation density and lattice misorientation were calculated, and their dependence on the loading path was analyzed. It is found that 1) local lattice rotation starts from the grain boundaries of grains with large Schmid factors, and propagates with increasing density of geometrically necessary dislocations, and 2) load paths (or applied strains) impact dislocation recovery and dislocation structures and, hence, affect lattice rotation and grain misorientation. We demonstrate how to utilize this information to calculate the driving force of grain refinement and to determine the orientation of recrystallized grains.