Study on Diffusion Welding Parameters of Particle reinforced Aluminium Matrix Composite Al_2O_(3p) /6061Al

Effects of diffusion welding process parameters on strength of welded joint based on particle reinforced aluminium matrix composite Al 2O 3p /6061Al have been studied through comparing with aluminium matrix alloy. The mechanism for loss of joint strength has been analyzed. It should be pointed out that key processing parameters affecting the strength of joint was welding temperature. The high quality joint can be successfully obtained with appropriate diffusion welding parameters.

STUDY ON DIFFUSION WELDING OF ALUMINIUN MATRIX COMPOSITE

Effects of diffusion welding parameters on strength of welded joint based on particle reinforced alumini- um matrix composite Al2O3p/6061Al were studied by comparing with aluminium matrix alloy,Mecha- nism for the loss of joint strength was analyzed.It was pointed out that the key processing parameters affecting the strength of joint was the welding temperature.The high quality joint can be successfully obtained with appropriate diffusion welding parameters.

Diffusion bonding mechanism and microstructure ofwelded joint of aluminium matrix composite Al_2O_(3p),/6061

Relationships between microstructures of welded joint and welding parameters or weld strength of aluminium matrix composite Al2O3p/6061 subjected to diffusion welding were studied. The results are as follows: key factor affecting strength of welded joint is oxide in the weld zone. The existence of oxide in the welded joint not only hinders the diffusion of the matrix atoms, but also destroys the good interface between the matrix and the reinforced phase. The oxides turn into fine particles from film with increasing welding temperature, and the destroying effect on welded joint decreases, which increases the strength of the welded joint. On the basis of this, the diffusion welding of aluminium matrix composite Al2O3p/6061 was successfully realized.

扩散焊条件下Al_2O_(3p)/6061Al复合材料中氧化膜的行为

研究了Al2O3P／6061Al铝基复合材料扩散焊接头区域氧化膜随焊接温度变化的规律，分析了氧化膜的变化机理，探讨了氧化膜对接头强度的影响结果表明，在扩散焊时，随焊接规范的变化Al2O3p／6061Al铝基复合材料接头区域的氧化膜含量及形态有明显的改变，这与Mg＋4／3Al2O3→Al2MgO4＋2／3Al反应有关，氧化膜的变化直接影响着焊缝的接头强度.

亚微米级Al_2O_(3p)/6061Al铝基复合材料扩散焊接工艺

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 % )。