摘要
The effects of Mg addition on mechanical thermo-electrical properties of Al.Mg/5%Al2O3 nanocomposite with differentMg contents （0, 5%, 10% and 20%） produced by mechanical alloying were studied. Scanning electron microscopy analysis （SEM）,X-ray diffraction analysis （XRD） and transmission electron microscopy （TEM） were used to characterize the produced powder. Theresults show that addition of Mg forms a predominant phase （Al.Mg solid solution）. By increasing the mass fraction of Mg, thecrystallite size decreases and the lattice strain increases which results from the atomic penetration of Mg atoms into the substitutionalsites of Al lattice. The microhardness of the composite increases with the increase of the Mg content. The thermal and electricalconductivities increase linearly with the temperature increase in the inspected temperature range. Moreover, the thermalconductivity increases with the increase of Mg content.
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。
