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Phase-field study of grain growth, recrystallization and texture evolution in AZ31 magnesium sheets
- Date: 02.10.2014
- Place: Symposium on Simulation of Phase Transformation and Microstructure Evolution of Materials, Korea Institute of Materials Science (KIMS), Changwon, South Korea
Phase-field studies are powerful tools for understanding microstructural changes in materials. Here phase-field studies are performed to investigate mechanisms of preferential growth which lead to improved formability in AZ31 Mg sheets. The texture and stress states of materials, studied via electron back scattered diffraction (EBSD) technique before and after annealing, are used for a phase-field model to simulate the texture evolution after initial compression. The results suggest that the residualstresses induced by in-plane compression is the main driving force for recrystallization and grain growth. The inhomogeneous stress distribution leads to preferential growth of texture, which are at lowest stress state, at the expense of initial basal texture. Limited mobility of twin boundaries changes the mixture of textures but it still favours growth of non-basal textures.
Keywords: Recrystallization and grain growth; Magnesium alloys; Phase-field simulation; Stress-driven grain growth; Twinning.