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通过搅拌铸造工艺制备体积分数为10%的SiC颗粒增强AZ91镁基复合材料。对复合材料依次进行了固溶、热变形和时效处理,研究了热处理对镁基复合材料组织和性能的影响。结果表明,铸态复合材料经固溶处理后,晶界处分布的大块Mg17Al12相消失,复合材料的强度和伸长率得到显著提高。热变形后,复合材料的晶粒细化,颗粒分布更加均匀,提高了复合材料的力学性能。经时效处理后,复合材料中析出弥散细小的Mg17Al12相,使热变形后复合材料的力学性能得到进一步提高。
The SiC particle reinforced AZ91 magnesium matrix composite with volume fraction of 10% was prepared by a stirring casting process. The composite materials were successively treated by solution heat treatment, thermal deformation and aging treatment. The effects of heat treatment on microstructure and properties of magnesium matrix composites were studied. The results show that the as-cast Mg17Al12 phase disappears at the grain boundary after solution treatment, and the strength and elongation of the composites are significantly increased. After thermal deformation, the composite grain refinement, particle distribution more uniform, improve the mechanical properties of the composite. After the aging treatment, the composite precipitated fine Mg17Al12 phase, so that the thermal deformation of the mechanical properties of composites has been further improved.