纯铜粉末包套-等径角挤压工艺实验研究  

Equal channel angular pressing of pure Cu powder in tubes

作　　者：王晓溪[1] 薛克敏[1] 李萍[1] 张翔[1] 王成[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《武汉科技大学学报》2011年第4期253-257,共5页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(50875072);霍英东教育基金资助项目(121053);安徽省优秀青年科技基金资助项目(10040606Y21)

摘　　要：针对粉末材料低塑性的特点,在室温条件下采用包套-等径角挤压工艺(PITS-ECAP)将纯铜粉末颗粒直接固结成高致密度块体细晶材料。结果表明,包套-等径角挤压工艺对粉末材料具有有效的致密和细化效果。4道次PITS-ECAP工艺变形后,试样X、Y、Z面均受到剧烈剪切作用,晶粒尺寸得到明显细化,显微组织呈细长条带流线状,且分布较为均匀;试样整体组织达到完全致密,平均显微硬度高达1 470 MPa。在PITS-ECAP工艺变形过程中,剧烈塑性剪切变形、较高静水压力和有效应变积累是保证粉末材料致密度大幅度提高以及显微组织有效细化的主要原因。In this study,pure Cu powder particles were successfully consolidated into full dense bulk material with fine grains at room temperature by the powder-in-tubes equal channel angular pressing（PITS-ECAP）.After four passes of PITS-ECAP via route Bc,microstructures at X,Y and Z planes of each sample were all severely sheared and elongated along a certain direction with fine banded structures;the grains were greatly deformed and refined with uniform size distribution;and the processed consolidate reached full density and its microhardness was greatly improved,which achieved up to 1470 MPa.It is indicated that it is severe plastic shear deformation,high hydrostatic pressure and effective strain accumulation that ensures a high density and a fine microstructure of powder consolidate.

关 键 词：挤压工艺 粉末包套-等径角挤压 纯铜粉末颗粒 

分 类 号：TG376[金属学及工艺—金属压力加工]