Effect of Dynamic Recrystallization Mode on Texture Components and Hardness for Nano-SiC Particles Reinforced Aluminum Matrix Composites Prepared Via Friction Stir Processing

Evolution of microstructure and texture in the stir zone (SZ), advancing side thermomechanically affected zone (AS-TMAZ), retreating side thermomechanically affected zone (RS-TMAZ) of nano-SiC reinforced aluminum matrix composites prepared via friction stir processing (FSP) was evaluated. The results show that continuous dynamic recrystallization mainly occurs in the SZ with the highest level of recrystallization. Dynamic recovery and partial dynamic recrystallization primarily occur in TMAZ and the level of recrystallization is the lowest in AS-TMAZ. The {001} < 100 > recrystallized cubic texture is mainly developed in the SZ. There are {001} < 110 > shear texture, {112} < 111 > copper texture, {110} < 112 > brass texture and {112} < 110 > shear texture formed in AS-TMAZ. The main texture components in RS-TMAZ are {123} < 634 > S texture, {012} < 100 > and {112} < 110 > texture. The formation of fine equiaxial grains and the uniform distribution of nano-SiC are the main contributors to the highest microhardness values of SZ.