等通道挤压大变形条件下原子的快速扩散行为研究  

Study of atomic superdiffusion phenomenon with the method of equal channel_angular pressing severe plastic deformation

作　　者：杜柳[1,2] 魏艳妮[1,2] 李京龙[1,2] 熊江涛[1,2] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西北工业大学摩擦焊接陕西省重点实验室,陕西西安710072

出　　处：《电焊机》2012年第8期91-93,共3页Electric Welding Machine

摘　　要：采用等通道挤压(Equal Channel Angular Pressing,ECAP)作为大变形手段,通过Ag-Pb互不相溶体系在ECAP和平衡态两种条件下原子扩散行为的对比,研究大变形条件下原子扩散行为。结果表明,ECAP条件下原子的热激活扩散系数高出平衡态1～2个数量级,揭示了大变形条件下原子快速扩散行为的存在。In this peper, Equal Channel Angular Pressing is chosen as severe plastic deformation,by comparing the diffusion action of ECAP and equilibrium condition in Ag-Pb immiscible system to study the atom diffusion action under severe plastic deformation condition.The study results show that ：The diffusion coefficient under ECAP condition is one to two orders of magnitude higher than that of the equilibrium,which reveal the exist of superdiffusion in severe plastic deformation.

关 键 词：等通道挤压大变形 快速扩散 平衡态 扩散系数 

分 类 号：TG453.9[金属学及工艺—焊接]