Characterization of microstructure and texture of binary Mg-Ce alloy processed by equal channel angular pressing
Résumé
The characterization of microstructure and texture development of binary Mg-0.3Ce (wt.%) after equal-channel angular pressing (ECAP) processing via route Bc at 300 and 350 °C through 4 passes were investigated using electron backscatter diffraction (EBSD) measurements. The results demonstrated an effective grain refinement from millimeter range to 6.7 and 8.3 µm obtained after 4 passes at 300 and 350 °C, respectively. The grain refinement was obtained through dynamic recrystallization (DRX). At 300°C, DRX occurred at low strain by twininduced dynamic recrystallization (TDRX) and particle stimulated nucleation (PSN) mechanism and then converted with increasing strain to sub-grain development (SD) and grain boundary bulging dynamic recrystallization (GBBDRX). Besides, grain growth occurred during processing at 350 °C. The texture development strongly depends on the strain level, deformation temperature and DRX mechanisms. At 300 °C, a typical basal texture with a deviation of 40° toward extrusion direction was formed gradually up to 4 passes while a completely different texture was formed at 350 °C due to the large grain size.
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