本研究使用AZ61鎂鋁合金做為複合材料機材，以微米級SiCp為強化相，利用重力鑄造及機械攪拌的方式製備鎂基複合材料，SiCp添加量為1wt.%及2wt.%，切割為各實驗試片後進行T4固溶處理並進行水淬，再將T4固溶處理完成的一半試片進行175℃ T6時效處理，探討不同強化相添加比例及不同熱處理對於AZ61/SiCp複合材料之微觀結構、機械性質及疲勞之影響。
從實驗結果中得到添加SiCp可以得到晶粒細化之效果，提升材料之降伏強度、極限抗拉強度及硬度但會受SiCp的影響降低複合材料的疲勞壽命及延展性。施做T6熱處理因為溫度對溶解度的影響使析出物生成，析出物硬脆的特性及強化相成核點的效果，會使鎂基複合材料的強度及硬度再次上升並且有效改善複合材料之疲勞壽命，但會因為過多的缺陷產生應力集中使材料延展性降低。

This research use AZ61 magnesium alloy as the metal matrix and micro-SiC particle as the reinforcement. In addition, the amount of 1 and 2 weight percent of the reinforcement particles were added respectively into matrix and produced by gravity casting. After homogenization and aging heat treatment, the specimens were tested for the mechanical properties, microstructure and fatigue test. Discussions of the effects of different ratios reinforcement and heat treatment have been included in this study.
According to the experimental results, when adding SiCp the grain size was found to decrease compared with pure magnesium alloys. Because of grain refinement, composites, yield strength, ultimate tensile strength and hardness were improved. However, the addition of reinforcement causes ductility and fatigue life to decrease. After aging heat treatment, β-phase was precipitated. In conclusion, aging heat treatment can improve strength , hardness and fatigue life effectively but decrease ductility because of stress concentration.

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