本研究利用鑄造方式製備AZ61鎂基複合材料，使用微米SiC顆粒作為所需添加的強化相，並以攪拌鑄造法的製程將強化相融入AZ61鎂合金中，強化相添加比例分別為1wt.%及2wt.%，之後對材料進行T4固溶處理，再使用離心式珠擊機進行珠擊，探討添加不同比例強化相及珠擊前後對鎂合金機械性質的影響。從實驗結果中可以發現添加微米SiCp顆粒能夠有效的達到晶粒細化效果，提升材料拉伸強度及疲勞循環壽命，其中則以微米1wt.% SiCp 的強化效果最優良，透過T4熱處理能使得β−Mg17Al12相溶解於機材中並析出鋁錳相，該相的析出有助於提升材料之延展性，並且可以從中發現Mg2Si相，此析出物有助於機械性質的提升。珠擊實驗結果顯示珠擊能有效提升鎂基複合材料的降伏強度、極限抗拉強度及疲勞循環壽命，而在較高負荷的疲勞試驗條件下，循環壽命提升的效果更為顯著，然而該材料的伸長量會因為珠擊後表面粗糙導致應變不均而降低伸長量。

Magnesium alloy AZ61 was used as matrix and SiC as reinforcement to produces metal matrix composites. Stir casting method was used to produce 1wt% and 2wt% of SiC reinforcement. As-cast billets were shot-peened by barrel type shot blasting machine. The ingots were investigated for mechanical and microstructural properties. The shot peening effects and reinforcement contents effects have been included.Experimental results reveal that grain size is decreased with the addition of SiC when compared with monolithic AZ61.From the experimental results it can be found that the grain size tends to decrease which causes the enhancement in yield strength(YS), ultimate tensile strength(UTS) and fatigue life when compared with the AZ61. AZ61 reinforced with 1wt%SiC has best mechanical properties. The T4 treatment dissolves the β-Mg_17 Al_12 (still few present) and generates Al-Mn phases which improves the ductility of the composites. Moreover, presence of Mg2Si phase also improves mechanical properties of AZ61-SiC metal matrix composites.The shot peening process has also increased the ultimate tensile strength(UTS), yield strength(YS) and fatigue life of the AZ61-SiC MMCs. The fatigue behavior was found better under the high stress conditions. The elongation of AZ61-SiC MMCs is decreased by differential strain of surface.

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