CuZnAl形状记忆合金等通道转角挤压工艺的研究  

Equal Channel Angular Pressing Technology of CuZnAl Shape Memory Alloy

作　　者：黄姝珂[1] 李宁[1] 胥永刚[1] 文玉华[1] 莫华强[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065

出　　处：《机械工程材料》2006年第2期22-24,64,共4页Materials For Mechanical Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20030610093)

摘　　要：研究了Cu-25.04Zn-3.83Al-0.2Zr形状记忆合金的ECAP过程以及不同温度挤压后组织和性能的变化。结果表明:在200℃挤压时加工硬化严重,无法进行多次挤压,250℃虽无明显的加工硬化,但挤压多次会出现裂纹,350℃挤压晶粒长大比较严重,较佳ECAP温度为300℃;合金在300℃经过一次挤压后,硬度从149 HB陡增到252 HB,随着挤压次数的增加,硬度略有增加并趋于稳定,达到275 HB左右;合金在300℃挤压后,晶粒虽无明显减小,但晶界更加清晰,晶粒更加规则,形成了具有大角度晶界的等轴晶,微观组织得到优化。The equal channel angular pressing（ECAP） process, mechanical properties and rnicrostructure of Cu-25.04%Zn-3. 83%Al-0. 2%Zr（wt%） shape memory alloy were studied. The alloy could be processed with ECAP at 200℃, 250℃, 300℃, 350℃, but the work-hardening was severe when processed at 200℃ and the repeat numbers of ECAP were limitary. Though 250℃ was higher than the alloy＇s recrystal temperature, when the numbers of ECAP increased there were cracks on the sample. The grain size grew heavily at 350℃, so the alloy＇s best temperature of ECAP was 300℃. The alloy＇s Brinell hardness increased rapidly from 149 to 252 through the first ECAP at 300℃, then it increased slowly and tended to be stable with the increasing of the number of ECAP. The alloy＇s grain size did not reduce clearly by ECAP at 300℃, but the grain boundaries were more clear and the grains were more regular. There were more wide-angle equiaxed grains and the rnicrostructure was optimized.

关 键 词：形状记忆舍金 CUZNAL 等通道转角挤压 

分 类 号：TG376[金属学及工艺—金属压力加工] TG139.6[一般工业技术—材料科学与工程]