亚微米级Al_2O_(3p)/6061Al铝基复合材料扩散焊接工艺

Diffusion welding process of submicron aluminium matrix composite Al_2O_(3p)/6061 Al

以亚微米级Al2 O3p/ 6 0 6 1Al铝基复合材料为对象 ,研究了直接扩散焊与采用中间层扩散焊两种工艺焊接铝基复合材料的特点、机理 ,分析了中间层对接头强度的影响规律。结果表明 ,在铝基复合材料液、固温度区间 ,存在”临界温度区域” ,在此温度区域进行直接扩散焊接时 ,通过液相基体金属的浸润 ,使得在扩散接合面中增强相 -增强相接触转化为增强相 -基体 -增强相的有机结合 ,获得高质量焊接接头 ;进一步研究发现 ,在扩散接合面上采用合适的基体中间层同样可以将增强相 -增强相接触转化为增强相 -基体 -增强相的有机结合 ,同时增大”临界温度区域”范围 ,接头性能更加稳定 ,接头变形量进一步减小 (<2 % )。

The characters and mechanism of submicron aluminium matrix composite (Al_2O_(3p)/6061Al) welding, by use of direct diffusion welding and interlayer diffusion welding, have been investigated, and the effect of interlayer on joint strength has been analysized. The result showed that there existed a critical temperature region between liquid and solid temperature of aluminium matrix composite. When diffusion welding happened in this temperature region, through the soakage of liquid base metal, reinforcement-reinforcement contact in diffusion joint surface converts to the organic integrating of reinforcement-base-reinforcement, and high quality welded joint were obtained. More research shows that, by using proper base interlayer, reinforcement-reinforcement contact in diffusion joint surface can convert to the organic integrating of reinforcementbase-reinforcement toe. Augment of scope of critical temperature region can make joint performance more stabilized and joint distortion more reduced ( <2% ).