ECAP纯铝L2的力学性能及微观组织研究.pdfVIP

Vol.29 No. 10 Oct.2008 FOUNDR TECHNOLOG 1377 ECAPL2 1 2 2 田景来 , 张忠明, 郭学锋 ( 1., 710055;2. , 710048) : 等通道转角挤压(ECAP) 是一种超细晶制备技术, 可细化合金组织, 改善材料性能本文 究发现,ECAP 纯铝L2, 抗拉 强度随挤压次数的增加而增加, 8道次左右达到饱和伸长率经1次挤压后大幅度下降, 由40%下降至15%,4 或5 道次时伸 长率有所增加硬度随挤压次数的增加而增加,在3~ 4 道次达到饱和纯铝L2原始晶粒大小为1 mm 的近等轴状晶,ECAP 后, 随挤压道次的增加, 向细小等轴晶转变至8 道次后, 晶粒大小约为1m : 等通道转角挤压(ECAP) ; 挤压次数; 力学性能;微观组织 + :TG146. 2 1; T G113 : A : 2008) St udy on the Mechanical Propert ies and Microstructures of Pure Aluminum L2 Processed by Equal Channel Angular Pressing 1 2 2 TIAN Jinglai , ZHANG Zhongming , GUO Xuefeng ( 1. College of Me allurgical Engineering, Xian Universi y of Archi ec ure and Technology, Xian 710055, China; 2. College of Ma erials Science and Engineering, Xian Universi y of Technology, Xian 710048, China) Abstract: Equal Channel Angular Pressing ( ECAP) is one of ultrafine grain preparing techniques, whichcan refine the structure of alloys and improve the capacities of materials. he results show that the tensile strength of pure aluminum L2 increases with pressing times of ECAP and reach its limit after pressing 8 times. he elongation decreases severely from 40% to 15% after the first pressing, but it increases slightly after 4 or 5 times pressing. he hardness also increases with pressing times and reaches saturated appearance after pressing 3 or 4 times. with increase of the pressing times, the initial grains of pure aluminum L2 with about 1 mm equiaxed grains change into fine equiaxed grains. he size of grains is approximately 1mafter pressing 8 times. Key words: Equal Channel Angular Pressing ( ECAP) ; Pressing times; Mechanical Prope