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تعداد صفحات این فایل: ۱۳ صفحه

بخشی از مقاله انگلیسیعنوان انگلیسی:Studying of micro-bonding in diffusion welding joint for composite~~en~~

Abstract

This paper reports the preliminary investigation of the micro-bonding of reinforcement/matrix and reinforcement/reinforcement in a diffusion welded joint for Al2O3p/6061Al composite and analyzes the microstructure and performance of the welded joint. Experimental results show that the interface of the matrix/reinforcement has better bonding only when the diffusion welding temperature is higher than the solid phase line of Al2O3p/6061Al composite. It is found that a critical temperature exists between solid and liquid phase line of the aluminum matrix composite. When the diffusion welding temperature reaches this value, not only the interface of the matrix/reinforcement exhibits better bonding, but also the welded joint can be greatly strengthened, the molten matrix penetrating into the interface of the reinforcement/reinforcement can change the bonding of reinforcement/reinforcement into reinforcement/matrix/reinforcement. Based on the experimental results, the authors firstly point out that the technology on non-interlayer liquid phase diffusion welding can successfully bond Al2O3p/6061Al composite.

۱ Introduction

Aluminum matrix composites have a widely applied prospect because of their high specific strength, stiffness and wear resistance. Welding, a second working technology is also stressed. However, it is difficult to obtain a good quality welded joint adopting molten welding methods, some defects exist such as pore and interface reactant because of the great difference between aluminum matrix and reinforcement in physical and chemical properties [1]. Diffusion welding, as one solid bond method, has widely been recognized all over the world, because the lower welding temperature can resist the interface reaction and is beneficial in obtaining a content welded joint [2]. Among the three bonding interfaces: matrix/matrix, matrix/reinforcement and reinforcement/reinforcement, during the aluminum matrix composite diffusion welding, only the matrix/matrix can easily obtain a better joint, while the matrix/reinforcement and reinforcement/reinforcement impede the diffusion welding joint to have a high strength joint [3–۵]. Therefore, how to solve the microbonding of matrix/reinforcement and reinforcement/reinforcement is the key to obtaining good quality diffusion welding for an aluminum matrix composite. Up to now, there is no report about it.

This paper will systematically study the micro-bonding of matrix/reinforcement and reinforcement/reinforcement, and try to discover a new technology, ‘non-interlayer liquid phase diffusion welding’, which the temperature being between solid phase line and liquid phase line of the aluminium matrix composite can greatly improve the joint strength.

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