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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2814


    Title: 直接擠壓鑄造A356鋁合金;Direct Squeeze Cast A356 Aluminum alloy
    Authors: 蔡維翔;Wei-Xiang Tsai
    Contributors: 機械工程研究所
    Keywords: A356鋁合金;擠壓鑄造;氧化膜;微孔;介在物;pore;oxide film;squeeze cast;A356 aluminum alloy;particle
    Date: 2007-01-19
    Issue Date: 2009-09-21 11:56:51 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 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.
    Appears in Collections:[機械工程研究所] 博碩士論文

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