大尺寸纯铝棒等径角多道次挤压数值模拟  

Numerical simulation of large-sized pure aluminum rod produced by ECAP with multi-passes

作　　者：赵小莲[1,2] 赵宁宁[2] 陈娜[2] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,广西南宁530004 [2]广西大学材料科学与工程学院,广西南宁530004

出　　处：《轻合金加工技术》2013年第3期49-53,共5页Light Alloy Fabrication Technology

基　　金：广西自然科学基金资助项目(桂科青0832006);广西大学有色金属及材料加工新技术教育部重点实验室开放基金(合同编号:GXKFJ-17)

摘　　要：为了通过大塑性变形获得具有优良性能的块状超细晶材料,对大尺寸纯铝棒进行了6道次ECAP有限元模拟,得到挤压过程中的挤压力、应力、应变规律曲线。模拟过程表明:随着挤压道次的增加,最大挤压载荷显著增大;等效应力、应变值分布的均匀性提高。这进一步说明多道次等径角挤压可以使纯铝达到良好的细化晶粒尺寸、提高晶粒分布均匀性的效果。In order to obtain the ultra-fine nubby grain materials with excellent properties through great ductility deformation, the 6-pass equal-channel angular producing large-sized pure aluminum rod has been simulated by finite pressing （ECAP） for element, the deforma- tion-law curves of extrusion pressure, stress and strain for producing large-sized pure alumi- num rod have been obtained. The simulation result shows that extrusion load being increased significantly while the pass number being increased, the equivalent stress and the distribution uniformity of strain value are increased as well, which illustrates further that the multi-pass e- qual channel angular pressing can produce large-sized pure aluminum rod with excellent fine crystals and the fine crystals distribute uniformly.

关 键 词：ECAP 大塑性变形 超细晶粒 大尺寸铝棒 数值模拟 

分 类 号：TG379[金属学及工艺—金属压力加工]