采用粉末冶金法制备了 Si C颗粒及晶须增强 MB15镁基复合材料的试样 ,借助扫描电镜对其显微结构及拉伸断口进行了观察和分析。同时 ,比较了 Si C颗粒和晶须对 MB15镁合金室温力学性能的影响。结果表明 ,Si C颗粒和晶须能显著提高 MB15镁合金的室温强度和弹性模量 ,且 Si C晶须的作用比 Si C颗粒更明显 The Si C particles and the whisker reinforced MB15 magnesium matrix composite were prepared by powder metallurgy method. The microstructure and tensile fracture of the composite were observed and analyzed by scanning electron microscopy. Meanwhile, the effects of Si C particles and whiskers on the mechanical properties of MB15 magnesium alloy at room temperature were compared. The results show that Si C particles and whiskers can significantly increase the room temperature strength and elastic modulus of MB15 magnesium alloy, and the effect of Si C whiskers is more obvious than Si C particles