机械合金化过程中Al-Pb相变的热力学和动力学研究  

Study on Phase Transformation and Thermodynamic and Kinetic of Al-Pb Powder During Mechanical Alloying

作　　者：冉广[1] 周敬恩[1] 席生岐[1] 李鹏亮[1] 

机构地区：[1]西安交通大学材料科学与工程学院,陕西西安710049

出　　处：《金属热处理》2004年第7期49-52,共4页Heat Treatment of Metals

摘　　要：将Al、Pb粉末按照Al 2 2 5Pb(at% ,下同 )的配比进行了机械合金化 ,并对Al Pb合金的物相、晶粒尺寸、点阵常数作了测定和分析。结果表明 ,机械合金化可以获得Al Pb纳米晶超饱和固溶体。参照Miedema半经验理论模型 ,计算了该合金系的相变驱动力 ,分析指出当Pb含量为 86 8%～ 98 4 %时 ,该合金系存在发生非晶的化学驱动力。利用机械合金化动力学机制分析了Al Pb形成过饱和固溶体和非晶的可能性 ,其中Al 2 2 5Pb形成固溶体的自由能要低于形成非晶的自由能 。The powders of Al-2.25Pb(at%,hereinafter same)were performed by mechanical alloying.Phase transformation,crystalline grain size and lattice constant of Al-Pb milled powders were determined and analyzed.The results showed that the nano-crystalline supersaturated solid solution of Al-Pb milled powders was synthesized by MA.A thermodynamic model was developed based on Miedema semi-experimental theory to calculate the driving force for phase evolution.The results showed that there was the possibility to form supersaturated solid solution and amorphous for the alloy with 86.8%～98.4% Pb in MA process by chemical driving force.The free energy of solid solution was lower than that of amorphous of Al-2.25Pb alloy,but the both free energy values were positive.

关 键 词：机械合金化 AL-PB合金 超饱和固溶体 热力学 非晶 

分 类 号：TF123.1[冶金工程—粉末冶金] TG164.2[冶金工程—冶金物理化学]