机械合金化制备Al-Pb纳米相复合结构的热力学分析

摘要

A thermodynamic model of mechanical alloying of Al-Pb system was established based on Miedema semi-experimental theory for guiding the preparation of Al-10%Pb mechanical alloying (MA) and thermodynamic calculation and analysis. Experiment shows that the Al-Pb nanophase composite alloy in which Pb particles dispersed into the Al matrix has been prepared by mechanical alloying. The thermodynamic analysis shows that there is no driving force to form amorphous phase, solid solution and intermediate compound. Microstructure of Al-10%Pb alloy during high energy ball milling was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). All of the calculation results are agreed with the experimental results.%参考Miedema半经验公式，建立Al-Pb系机械合金化过程的热力学模型，并对所制备的Al-10%Pb粉末进行热力学计算和对比分析。实验表明利用机械合金化方法可以获得在Al基体上均匀弥散分布着纳米相Pb的复合结构；热力学计算结果表明，Al-Pb 系粉末机械合金化过程不具备形成非晶相、固溶体和中间化合物的热力学驱动力。采用 X 射线衍射仪(XRD)和扫描电子显微镜(SEM)分析 Al-10%Pb 合金在高能球磨过程中的组织结构，表明，所建立的热力学模型是正确的。