本文關(guān)鍵詞：高性能熱傳導(dǎo)6063鋁合金材料的研究　出處：《廣西大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： Al-Mg-Si系合金 導(dǎo)熱能力 鎂硅比 稀土Ce

【摘要】：本論文研究了不同鎂硅比和不同稀土含量對6063鋁合金組織和導(dǎo)熱性能的影響。利用熱擴(kuò)散系數(shù)測試儀LFA457,差熱分析儀DSC404C,測試合金的導(dǎo)熱性能。運(yùn)用掃描電鏡、金相顯微鏡等分析手段分析合金在不同狀態(tài)的顯微組織,主要結(jié)論如下：(1)鎂硅比對基體中組織的形貌、6063鋁合金的導(dǎo)熱性能和綜合機(jī)械性能有重要的影響。鎂含量為0.65%且鎂硅比為1.5的6063鋁合金導(dǎo)熱性能有最佳值。隨著Mg/Si從1.73到1.3逐步變化,Al9Fe2Si2相從球狀、塊狀轉(zhuǎn)變?yōu)獒槧罨蛘呒饨菭睢?2)Ce和基體中的Fe、Si形成CeAlFeSi相,在6063鋁合金中以金屬間化合物的形式析出。稀土加入量的增多會使CeAlFeSi相中的Fe元素逐步被Ce取代,加入量增加到一定的范圍(0.3%)將形成合金導(dǎo)熱性的新障礙AlCe4相。(3) 向6063鋁合金中分別加入含量0.15%的La、Ce、La/Ce稀土,發(fā)現(xiàn)添加Ce的6063鋁合金導(dǎo)熱性能最好。(4)均勻化熱處理雖然會降低合金的導(dǎo)熱性能,但是能提高合金的硬度、抗拉強(qiáng)度和斷裂伸長率等機(jī)械性能。(5) 時效處理后合金導(dǎo)熱率有所下降,延伸率降低,抗拉強(qiáng)度先增大后減小,硬度隨著時間的延長先增加后減小。
[Abstract]:In this paper, the effects of different ratios of magnesium-silicon and rare earth on the microstructure and thermal conductivity of 6063 aluminum alloy were studied. The thermal diffusivity tester LFA457, differential thermal analyzer (DSC404C) was used. The microstructure of the alloy in different states was analyzed by scanning electron microscope (SEM) and metallographic microscope (SEM). The main conclusions are as follows: 1) the morphology of the microstructure in the matrix by Mg-Si ratio. The thermal conductivity and comprehensive mechanical properties of 6063 aluminum alloy have an important influence. The optimum thermal conductivity of 6063 aluminum alloy with magnesium content of 0.65% and Mg-Si ratio of 1.5 is obtained. 73 to 1.3 gradual changes. The Al9Fe2Si2 phase is changed from spherical or massive to needle-shaped or angle-like. 2Ce and Fesi Si in the matrix to form CeAlFeSi phase. The Fe element in CeAlFeSi phase will be replaced by ce gradually with the increase of the amount of rare earth in 6063 aluminum alloy. When the addition amount is increased to a certain range, the new barrier of thermal conductivity of the alloy, AlCe4 phase, will be formed, and the content of Lahuo ce of 0.15% will be added to the 6063 aluminum alloy, respectively. La/Ce rare earth, it is found that 6063 aluminum alloy added ce has the best thermal conductivity. 4) homogenization heat treatment can decrease the thermal conductivity of the alloy, but it can improve the hardness of the alloy. The mechanical properties such as tensile strength and elongation at break. 5) after aging treatment, the thermal conductivity of the alloy decreased, the elongation decreased, the tensile strength first increased and then decreased, and the hardness increased first and then decreased with the extension of time.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG146.21

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本文編號：1433843