高性能热传导6063铝合金材料的研究

发布时间：2018-01-16 16:13

本文关键词：高性能热传导6063铝合金材料的研究　出处：《广西大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文研究了不同镁硅比和不同稀土含量对6063铝合金组织和导热性能的影响。利用热扩散系数测试仪LFA457,差热分析仪DSC404C,测试合金的导热性能。运用扫描电镜、金相显微镜等分析手段分析合金在不同状态的显微组织,主要结论如下：(1)镁硅比对基体中组织的形貌、6063铝合金的导热性能和综合机械性能有重要的影响。镁含量为0.65%且镁硅比为1.5的6063铝合金导热性能有最佳值。随着Mg/Si从1.73到1.3逐步变化,Al9Fe2Si2相从球状、块状转变为针状或者尖角状。(2)Ce和基体中的Fe、Si形成CeAlFeSi相,在6063铝合金中以金属间化合物的形式析出。稀土加入量的增多会使CeAlFeSi相中的Fe元素逐步被Ce取代,加入量增加到一定的范围(0.3%)将形成合金导热性的新障碍AlCe4相。(3) 向6063铝合金中分别加入含量0.15%的La、Ce、La/Ce稀土,发现添加Ce的6063铝合金导热性能最好。(4)均匀化热处理虽然会降低合金的导热性能,但是能提高合金的硬度、抗拉强度和断裂伸长率等机械性能。(5) 时效处理后合金导热率有所下降,延伸率降低,抗拉强度先增大后减小,硬度随着时间的延长先增加后减小。
[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.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG146.21

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