Diffusion bonding mechanism and microstructure ofwelded joint of aluminium matrix composite Al2O3p,/6061
(National Key Laboratory of Advanced Welding Production Technology; Harbin Institute of Technology; Harbin 150001; P. R. China；
General Chnsulate of Sweden in Shanghai; Shanghai 200031; P. R. China)
General Chnsulate of Sweden in Shanghai; Shanghai 200031; P. R. China)
Abstract: 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
Key words: aluminium matrix composite; oxide; welded joints; microstructure