Abstract
The influence of particle deformation zone (PDZ) size on dynamic recrystallization (DRX) and precipitation behavior of SiCp/Mg-5Zn material was investigated through the hot compression. First, the microstructure and microhardness of matrix in PDZ were characterized for SiCp/Mg after compression at room temperature. Then, the microstructure evolution of SiCp/Mg-5Zn materials with different PDZ size was analyzed by optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) after compressing different strains. The results show that a significant misorientation gradient was formed near the particle for SiCp/Mg after compression at room temperature, but which is smaller than that around the grain boundary. The addition of SiCp can promote DRX nucleation of Mg matrix, but the promotion effect of particles on DRX nucleation is less than that of grain boundaries for SiCp/Mg-5Zn material during the hot compression, which causes a decrease in the DRXed ratio of SiCp/Mg-5Zn material with increasing PDZ size. Moreover, the volume fraction and size of precipitated phase both decrease with increasing the PDZ size. The aim of this work is to provide a strategy to acquire Mg alloys with excellent mechanical performance by regulating the microstructure of Mg matrix.
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