On the infiltration behavior of Al, Al-Li, and Mg meltas through SiC
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Authors: | B S Murty S K Thakur B K Dhindaw |
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Affiliation: | (1) the Metallurgical and Materials Engineering Department, Indian Institute of Technology, 721 302 Kharagpur, India |
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Abstract: | Aluminum, Al-Li(8090), and Mg matrix composites with uniform distributions of SiC
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reinforcement have been prepared by the vacuum infiltration technique. The infiltration kinetics have been found to increase
in the order of Al, Al-Li, and Mg. The Al-Li alloy and Mg as matrix materials have shown improved wettability with SiC
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in comparison to Al, leading to enhanced infiltration kinetics and reduced reinforcement degradation in the former cases.
The infiltration kinetics are insensitive to preheat temperature beyond a critical temperature, which is close to the melting
point of the matrix. A marginal improvement in infiltration kinetics could be obtained with Cu and Ni coating on SiC and on
its dynamic oxidation. The improvement is significant at a higher preheat temperature of SiC. The Vickers hardness, measured
on the SiC particles, has been shown to be an index of the strength of the interface between the matrix and reinforcement
in the composite. |
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