本研究採用AZ91鎂鋁合金作為鎂基複合材料之基質材料，以石墨烯(Graphene nanoplatelets, GNPs)、奈米碳管(Carbon nanotubes, CNTs)作為強化相，利用重力鑄造法及機械攪拌法進行鎂基複合材料之製備，強化相添加量為0.1wt%、0.2wt%、0.3wt%，完成製備切割成實驗試片後一部分施作T4固溶熱處理後直接進行水淬，另一部分進行T4固溶熱處理及T6人工時效熱處理，探討添加不同重量百分比強化相及不同熱處理對於AZ91/GNPs+CNTs鎂基複合材料之微觀結構、機械性質。從實驗結果中可以發現添加奈米級之碳強化相可以得到晶粒細化之效果，降伏強度、極限強度、延展性及硬度皆有所提升，透過T4熱處理後將第二相Mg17Al12溶入基材中有助於提升材料延展性，提升極限強度。施作T6熱處理之後使第二相析出後，因析出物硬脆特性使材料硬度、降伏強度有所上升。

This research uses AZ91 magnesium alloy as the metal matrix and graphene nanoplate and carbon nanotube as the reinforcement. In addition, the amount of 0.1, 0.2 and 0.3 weight percent of the reinforcement particles were added respectively into matrix and produced by gravity casting. After T4 solution treatment and T6 aging heat treatment, the specimens were tested for the mechanical properties and microstructure. Discussions of the effects of different ratios reinforcement and heat treatment have been included in this experiment. From the experiment result, when adding GNPs and CNTs the grain size was decreased effectively. Yield strength, ultimate tensile strength and hardness were improved due to the grain refinement. After T4 solution treatment, ultimate tensile strength and ductility were improved. After T6 aging heat treatment, β-phase was precipitated, hardness and yield strength were strength.

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