Pulse-Impact on Microstructure of Liquid-Phase-Pulse-Impact Diffusion Welded Joints of Particle Reinforcement Aluminum Matrix Composites at Various Temperatures

Kelvii Wei Guo

Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China.

DOI: 10.4236/eng.2013.57069                

Abstract

Investigation was to study the influence of pulse-impact on microstructure of Liquid-Phase-Pulse-Impact Diffusion Welding (LPPIDW) welded joints of aluminum matrix composite SiC_p/A356, SiC_p/6061Al, Al₂O_3p/6061Al. Results showed that under the effect of pulse-impact: 1) the interface state between reinforcement particle (SiC, Al₂O₃) and matrix was prominently; 2) the initial pernicious contact-state of reinforcement particles was changed from reinforcement (SiC, Al₂O₃)/reinforcement (SiC, Al₂O₃) to reinforcement (SiC, Al₂O₃)/matrix/ reinforcement (SiC, Al₂O₃); 3) the density of dislocation in the matrix neighboring to and away from the interface in the matrix was higher than its parent composite; and 4) the intensively mutual entwisting of dislocation was occurred. Studies illustrated that: 1) deformation was mainly occurred in the matrix grain; and 2) under the effect of pulse-impact, the matrices around reinforcement (SiC, Al₂O₃) particles engendered intensive aberration offered a high density nucleus area for matrix crystal, which was in favor of forming nano-grains and improved the properties of the successfully welded composite joints.

Keywords

Aluminum Matrix Composite; Particle Reinforcement; Pulse-Impact; Microstructure; Diffusion Welding

Conflicts of Interest

The authors declare no conflicts of interest.

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