鎂基複合材料(Magnesium Metal Matrix Composites, Mg MMCs)具有比鎂合金相對優異的力學性能，經由在基材中加入如微粒、短纖維和連續纖維等強化相，使基材和強化相在擁有良好的結合性的情況下，以提升機械性質。本研究選用三種粒徑尺寸之微米級碳化矽顆粒(SiCp，p：particle)為強化相，以攪拌鑄造的方式將強化相均勻散佈於AZ61鎂合金中，製備鎂合金複合材料。為求材料成份的均勻，統一將鑄錠進行固溶處理，以消除偏析使材料均質化，同時提升材料的延展性，以利進行後續的擠製加工；擠製加工部份，必須在適當的擠製溫度與速度下進行圓棒的擠製，以求良好的擠製成品。最後進行鎂基複材鑄錠(Ingot)和擠製棒材(Rod)之機械性質比較與探討，同時進一步觀察兩者的微觀結構，探討強化相粒徑尺寸對鎂基複材之影響。
本研究結果顯示，隨著強化相粒徑尺寸的增加，鎂基複材鑄錠之極限強度、降伏強度、延展性、硬度則逐漸下降，粒徑尺寸10 μm相較1 μm分別下降了19.2%、10.7%、36.7%、2.5%；擠製棒材部份，AZ61/5 wt% SiCp/1 μm有較佳的機械性質，其機械性質也隨著強化相粒徑尺寸的增加而下降。AZ61/5 wt% SiCp/1 μm擠製棒材其極限強度316.0 MPa、降伏強度147.5 MPa、延展性16.6%、硬度69.1 HV，相較於同成份的鎂基複材鑄錠，分別提升74.1%、97.7%、176.7%、13.5%；而相較於AZ61擠製棒材，除延展率下降外則分別提升5.3%、12.4%、3.7%。擠製棒材經時效處理後，極限強度、降伏強度、硬度皆得到了提升，因β相的析出而使延展性下降。
本研究在AZ61/5 wt% SiCp/10 μm鑄錠經固溶處理後，於金相圖中之晶粒與晶界處發現有Mg2Si化合物，從而影響鎂基複材之機械性質。由數據結果顯示，當添加強化相粒徑尺寸為10 μm時，機械性質有明顯地下降趨勢。
並由強化機制之貢獻度計算結果證實，其晶界強化的影響，為本研究主要提升降伏強度的主因。

The mechanical behavior of magnesium metal matrix composites (Mg MMCs) are superior to those of the pure metal alloy. By adding the reinforcement, such as particles, short fibers, or continuous fibers, into the metal matrix can improve the composite’s mechanical properties. Three different particle size of SiCp are dissolved into AZ61 by the stir-casting method, and then the Mg-based composite is fabricated. Before extrusion, solid solution treatment was conducted to improve the ductility of the material. Eventually, the mechanical properties of the composite before and after the extrusion with aging treatment are discussed.
The results shows that the ultimate tensile strength, yielding strength, ductility and hardness of magnesium matrix composites will decrease with increasing the size of reinforcement. The ultimate tensile strength, yielding strength, ductility and hardness of AZ61/5 wt% SiCp/10 μm ingot are 146.7 MPa, 66.6 MPa, 3.8% and 59.4 HV, respectively. Compared with the AZ61/5 wt% SiCp/1 μm ingot were reduced 19.2%、10.7%、36.7%、2.5%. For the extrusion rod, AZ61/5 wt% SiCp/1 μm exhibits better mechanical properties, which will decrease with increasing the reinforcement size. The ultimate strength, yielding strength, ductility and hardness are 316.0 MPa, 147.5 MPa, 16.6% and 69.1 HV, respectively. In addition, aging treatment will enhance the ultimate strength, yielding strength and hardness of rods.
In this study, microstructure of AZ61/5 wt% SiCp/10 μm ingot shows Mg2Si compound at the grain boundaries after solid solution treatment. The Mg2Si compound will affect the mechanical properties of magnesium matrix composite. From the experiment results, the mechanical properties decreased greatly with the reinforcement size of 10 μm.

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