材料科学
热导率
微观结构
固溶体
体积分数
价电子
原子半径
冶金
溶解度
Atom(片上系统)
热力学
分析化学(期刊)
电子
复合材料
物理化学
化学
物理
有机化学
嵌入式系统
量子力学
色谱法
计算机科学
作者
Liping Zhong,Jian Peng,Song Sun,Yongjian Wang,Yun Lu,Fusheng Pan
标识
DOI:10.1016/j.jmst.2016.08.026
摘要
The microstructure and thermal conductivity of four groups of Mg–rare earth (RE) binary alloys (Mg–Ce, Mg–Nd, Mg–Y and Mg–Gd) in as-cast and as-solutionized states were systematically studied. Thermal conductivity was measured on a Netzsch LFA457 using laser flash method at room temperature. Results indicated that for as-cast alloys, the volume fraction of second phases increased with the increase of alloying elements. After solutionizing treatment, a part or most of second phases were dissolved in α-Mg matrix, except for Mg–Ce alloys. The thermal conductivity of as-cast and as-solutionized Mg–RE alloys decreased with the increase of concentrations. The thermal conductivity of as-solutionized Mg–Nd, Mg–Y and Mg–Gd alloys was lower than that of as-cast alloys. Thermal conductivity of as-solutionized Mg–Ce alloys was higher than that of as-cast alloys, because of the elimination of lattice defects and fine dispersed particles during solutionizing treatment. Different RE elements have different influences on the thermal conductivity of Mg alloys in the following order: Ce < Nd < Y < Gd. Ce has the minimum effect on thermal conductivity of Mg alloys, because of the very low solubility of Ce in the α-Mg matrix. The variations in the atomic radius of the solute elements with Mg atom (Δr), valence, configuration of extra-nuclear electron of the solute atoms, and the maximum solid solubility of elements in the α-Mg matrix were suggested to be the main reasons for the differences in thermal conductivity of resulting Mg–RE alloys.
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