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采用反复塑性变形(RPW)技术,结合挤压工艺制备出SiC颗粒增强AZ31镁基复合材料,研究了循环次数(RPW次数)对SiCp/AZ31镁基复合材料显微组织和性能的影响。结果表明,反复塑性变形具有明显的AZ31基体晶粒细化、SiCp细化和分散作用,能显著提高SiCp/AZ31复合材料的抗拉强度和硬度,并改善其塑性。在SiCp的体积分数为4%时,经RPW为300次的热挤压后,AZ31基体晶粒粒径达到最小值20μm,SiCp被粉碎成3μm以下的微粒,且弥散分布于合金基体中,复合材料的室温抗拉强度和硬度(HV)达到或接近最大值,分别为359MPa和107。
SiC particle reinforced AZ31 magnesium matrix composites were prepared by repeated plastic deformation (RPW) technique and extrusion process. The effect of number of cycles (RPW) on the microstructure and properties of SiCp / AZ31 magnesium matrix composites was investigated. The results show that the repeated plastic deformation has the obvious grain refinement of AZ31 matrix, the refinement and dispersion of SiCp, which can significantly improve the tensile strength and hardness of SiCp / AZ31 composites and improve their plasticity. When the volume fraction of SiCp is 4%, the grain size of AZ31 matrix reaches a minimum value of 20μm after the RPW is heated 300 times, and SiCp is pulverized into fine particles with a size of 3μm and diffused in the alloy matrix, Materials at room temperature tensile strength and hardness (HV) at or near the maximum, respectively 359MPa and 107.