Studying of micro-bonding in diffusion welding joint for composite

This paper reports the preliminary investigation of the micro-bonding of re inforcement/matrix and reinforcement/reinforcement in a diffusion welded jo int for Al(2)O(3)p/6061Al composite and analyzes the microstructure and per formance of the welded joint. Experimental results show that the interface of the matrix/reinforcement has better bonding only when the diffusion weld ing temperature is higher than the solid phase line of Al(2)O(3)p/6061Al co mposite. It is found that a critical temperature exists between solid and l iquid phase line of the aluminium matrix composite. When the diffusion weld ing temperature reaches this value, not only the interface of the matrix/re inforcement exhibits better bonding, but also the welded joint can be great ly strengthened, the molten matrix penetrating into the interface of the re inforcement/reinforcement can change the bonding of reinforcement/reinforce ment into reinforcement/matrix/reinforcement. Based on the experimental res ults, the authors firstly point out that the technology on non-interlayer l iquid phase diffusion welding can successfully bond Al(2)O(3)p/6061Al compo site. (C) 2001 Elsevier Science B.V. All rights reserved.