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采用机械合金化制备不同Mg含量(0,5%,10%,20%)的Al-Mg/5%Al_2O_3纳米复合材料,研究Mg含量对材料力学和热电性能的影响。采用扫描电子显微镜、X射线衍射和透射电子显微镜对所得粉末进行表征。结果表明,往Al-Al_2O_3复合材料中添加Mg可形成Al-Mg固溶体。随着Mg含量的增加,Al的点阵位置逐渐被Mg取代,导致晶粒尺寸减小,晶格应变增加。随着Mg含量的增加,复合材料的显微硬度增加。热导率和电导率随着温度升高线性增加。热导率随Mg含量的增加而增加。
Al-Mg / 5% Al 2 O 3 nanocomposites with different Mg contents (0, 5%, 10% and 20%) were prepared by mechanical alloying to study the effect of Mg content on the mechanical and thermoelectric properties of the materials. The resulting powder was characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results show that Al-Mg solid solution can be formed by adding Mg to Al-Al_2O_3 composite. With the increase of Mg content, the lattice position of Al is gradually replaced by Mg, resulting in the decrease of grain size and the increase of lattice strain. With the increase of Mg content, the microhardness of the composites increases. Thermal conductivity and electrical conductivity increase linearly with increasing temperature. Thermal conductivity increases with increasing Mg content.