本研究在不同製程參數（澆鑄溫度、擠壓壓力）下，利用直接擠壓鑄造方式獲得Al - ( 6.0~8.0 wt.% ) Si - ( 0.3-0.5 wt.%)Mg鋁合金鑄件，用以探討合金成分、介在物/微孔數目和氧化膜對於洛氏硬度和拉伸性質的影響。
實驗結果顯示：（1）合金成分中矽和鎂元素含量增加可提高鑄件平均硬度和機械性質，但氧化膜和介在物會增加；（2）鑄件內殘留的介在物數目遠少於共晶矽，因此對於洛氏硬度影響不明顯；（3）微孔對於硬度影響取決與微孔尺寸與數目；（4）鑄件內殘留的氧化膜對於鑄件硬度分佈無明顯的關連；（5）Al-6.0Si-0.3Mg鋁合金在擠壓壓力120MPa，澆溫685℃和模溫180-200℃的製程參數下可獲得最佳的拉伸試驗可靠度（Weibull parameter：53.7）；Al-7.64Si-0.52Mg鋁合金在擠壓壓力60MPa，澆溫685℃和模溫180-200℃的製程參數下會獲得最差的拉伸試驗可靠度（Weibull parameter：9.9）。

Effects of particle/pore counts, oxide film, and alloy compositions on hardness and mechanical properties of squeezed cast Al-7Si-0.4Mg alloys at different process parameters ( pouring temperature and squeeze pressure ) were investigated in this study.
Experimental results show that: (1) Increase both magnesium and silicon content slightly increase hardness and mechanical properties of squeezed Al-7Si-0.4Mg alloy. (2) Particle counts trapped in squeezed Al-7Si-0.4Mg show low fraction of eutectic silicon. (3) Pore counts effects the measured hardness of squeezed Al-7Si-0.4Mg alloy. (4) Reliability on UTS is highest (Weibull parameter for squeezed Al-6Si-0.3Mg alloy is 53.7) when pouring temperature is 685℃, mold temperature remains 180-200℃ and squeeze pressure keeps 120MPa.

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