镓中间层1420铝锂合金扩散连接界面组织与性能  

Interfacial microstructure and mechanical property of diffusion bonding joint of 1420 Al-Li alloy by using gallium as interlayer

作　　者：牛涛[1] 侯红亮[1] 王耀奇[1] 张艳苓[1] 

机构地区：[1]北京航空制造工程研究所,北京100024

出　　处：《塑性工程学报》2014年第6期112-116,共5页Journal of Plasticity Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB012803);国家自然科学基金重点资助项目(51334006)

摘　　要：采用机械加压的方法,在大气环境下开展镓中间层1420铝锂合金扩散连接试验;通过光学显微镜、扫描电镜和剪切强度试验等方法,研究了温度、压力、时间3个参数对界面组织和接头性能的影响规律。结果表明,温度越高,压力越大,时间越长,形成的界面组织越好,接头性能越高,且接头剪切断口形貌表现为越来越多的撕裂带,其规律与普通扩散连接相同。当温度520℃、压力11MPa、时间1h时,接头剪切强度达到81.6MPa。随着温度的增加和时间的延长,在界面附近形成了越来越宽的镓分布层,表明中间层镓沿晶界向母材的扩散距离越来越大,反映出原子扩散进行的越来越充分。但压力对此影响不大。Diffusion bonding of 1420 Al‐Li alloy was carried out by using gallium as interlayer under mechanical compression force in air .The effect of bonding temperature ,joining pressure and time on interfacial microstructure an joint properties was studied by OM ,SEM and shearing experiments .The results show that ,the interfacial microstructure and mechanical property of the joints perform better with higher temperature ,larger pressure and longer time ,while the fracture surface of the shearing test presents more scratch of tearing ,which is consistent with general diffusion bonding .The shearing strength of the joints reaches to 81.6MPa at the temperature of 520℃ under the pressure of 7MPa for the time of 1h .A layer of gallium is found distributed near the interface and the width increases with the higher temperature and longer time ,which indicates the diffusion distance of the gal‐lium to the base metal along grain boundary is more and more farther and atom diffusion performs more and more adequately .But the effect of pressure on this is small .

关 键 词：铝锂合金 扩散连接 中间层 镓 

分 类 号：TG456.9[金属学及工艺—焊接]