鎂基複合材料具有比鎂合金相對優異的力學性能，經由在基材中加入陶瓷顆粒、纖維、晶鬚等強化相，使基材與與強化相擁有良好的結合性，進一步提升複合材料之機械性質。
本研究的基材選用AZ31鎂合金添加重量百分比為0.5 wt.%之碳化矽顆粒SiCp作為強化相，以重力鑄造與機械攪拌方式進行鎂基複合材料的製備。為求材料成分均勻，對製備後的鎂基複合材料進行T4固溶處理，消除偏析使材料均質化，以利後續進行加工。之後對鎂基複合材料進行二次加工，採用不同的鍛造溫度對鎂基複合材料的機械性質及微觀結構進行探討與研究。
從實驗結果中可以發現添加SiCp能夠透過晶粒細化有效的提升材料之降伏強度及延展性，透過T4熱處理能使得β-Mg_17 Al_12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，而透過兩種溫度鍛造能使材料產生動態再結晶使晶粒尺寸大小更細並提升材料延展性及拉伸強度，且在SiCp添加的複合材料中發現微小團聚現象，推測其為造成材料伸長量下降的主要原因。
實驗結果顯示AZ31鎂合金經150℃鍛造得到最好的機械性質(降伏強度：74.1 MPa極限拉伸強度：135.9 MPa伸長量3.7%)，而AZ31/0.5 wt.% SiCp經150℃鍛造得到最好的伸長量(4.9%)，但在220℃鍛造下降伏強度(83.6 MPa)與極限拉伸強度(152.2 MPa)有更優異的提升。

Magnesium-based composites have superior mechanical properties comparing with magnesium alloys by adding a reinforcement such as ceramic particles, fibers or whiskers to the metal matrix. The metal matrix presents form good bonding with the reinforcement. The mechanical properties of the composite then are further improved.
In this study, AZ31 magnesium alloy was added with 0.5 wt.% by weight of silicon carbide particles(SiCp) of reinforcement in order to obtain uniform material composition. The prepared magnesium-based composite material is subjected to T4 treatment to eliminate segregation and homogenize the material for subsequent processing. Afterwards, the magnesium-based composites were subjected to secondary processing, and the mechanical properties and microstructure of the magnesium-based composites were investigated and studied using different forging temperatures.
From the experimental results, it can be found that adding additional SiCp in the matrix can effectively enhance the material's strength and ductility through grain refinement. Through T4 heat treatment, the β-Mg_17 Al_12 phase can be dissolved in the material and aluminum precipitates. The precipitation of this phase increase the ductility of the material. Two kinds of temperatures forging experiment enables dynamic recrystallization of the material to refine the grain size and increase its ductility and tensile strength. And a small agglomeration phenomenon was found in the composite material added by SiCp, which is presumed to be the main cause of the decrease in the elongation of the material.
The experimental results show that the AZ31 magnesium alloy is forged at 150°C to obtain the best mechanical properties (YS: 74.1 MPa ,UTS: 135.9 MPa ,EL%: 3.7%),and the AZ31/0.5 wt.% SiCp forged at 150 °C obtain the best EL%(4.9%), but the YS (83.6 MPa) and the UTS (152.2 MPa) at 220°C were improved.

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