TITLE:
Pulse-Impact on Microstructure of Liquid-Phase-Pulse-Impact Diffusion Welded Joints of Particle Reinforcement Aluminum Matrix Composites at Various Temperatures
AUTHORS:
Kelvii Wei Guo
KEYWORDS:
Aluminum Matrix Composite; Particle Reinforcement; Pulse-Impact; Microstructure; Diffusion Welding
JOURNAL NAME:
Engineering,
Vol.5 No.7,
July
15,
2013
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 SiCp/A356, SiCp/6061Al,
Al2O3p/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.