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| Solidification microstructure of 3D--meshy SiC/Cu metal matrix composites |
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| 中国科学院金属研究所 |
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Cite this article:
. Solidification microstructure of 3D--meshy SiC/Cu metal matrix composites. Chin J Mater Res, 2004, 18(6): 597-605.
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Abstract 3D--meshy SiC/Cu metal matrix composite was fabricated by squeeze casting process.
The influence of process conditions on solidification microstructure of the composites
was studied. The results showed that 3D--meshy SiC ceramic skeleton played an important
role during the solidification of the matrix and the course of crystal growth and
crystallization. Under the certain conditions,
the dendrites perpendicular to skeleton surface appeared, and the
fine and even equiaxed grains structure formed. The influence of skeleton apertures
on microstructure was very remarkable. The fine apertures were benefit to grain
refining and structure uniformity, while big apertures were apt to produce macroscopic
segregation and concentration of plumbum. The tin inverse segregation was lightened
for the SiC skeleton, because tin was gathered in a very narrow region near the surface
of skeleton, which avoided tin mass segregation in the surface layer of the cast.
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Received: 29 December 2004
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