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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。
The diffusion bonding of 1420 Al-Li alloy in gallium intermediate layer was carried out in atmospheric environment by mechanical pressurization method. The effects of temperature, pressure and time on the interfacial microstructure of interface were studied by means of optical microscope, scanning electron microscope and shear strength test. And joint performance of the law. The results show that the higher the temperature is, the higher the pressure is, the longer the time is, the better the interfacial microstructure is formed and the higher the joint performance is. The appearance of the shear fracture of the joint is more and more tearing zone. The regularity and general diffusion The same connection. When the temperature is 520 ℃, the pressure is 11MPa, the time is 1h, the joint shear strength reaches 81.6MPa. With the increase of temperature and the extension of time, a wider and wider distribution of gallium was formed in the vicinity of the interface, indicating that the diffusion distance of gallium in the middle layer from the base metal to the base material is getting larger and larger, reflecting the progress of atom diffusion The fuller. But pressure has little effect on this.