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Studies on age-hardening characteristics of ceramic particle/matrix interfaces in Al–Cu–SiCp composites using ultra low-load-dynamic microhardness measurements

Published online by Cambridge University Press:  31 January 2011

B. Dutta  and
M. K. Surappa
B. Dutta
Affiliation:
Centre for Advanced Study, Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India
M. K. Surappa
Affiliation:
Centre for Advanced Study, Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India
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Abstract

Ultra low-load-dynamic microhardness testing facilitates the hardness measurements in a very low volume of the material and thus is suited for characterization of the interfaces in MMC's. This paper details the studies on age-hardening behavior of the interfaces in Al–Cu–5SiCp composites characterized using this technique. Results of hardness studies have been further substantiated by TEM observations. In the solution-treated condition, hardness is maximum at the particle/matrix interface and decreases with increasing distance from the interface. This could be attributed to the presence of maximum dislocation density at the interface which decreases with increasing distance from the interface. In the case of composites subjected to high temperature aging, hardening at the interface is found to be faster than the bulk matrix and the aging kinetics becomes progressively slower with increasing distance from the interface. This is attributed to the dislocation density gradient at the interface, leading to enhanced nucleation and growth of precipitates at the interface compared to the bulk matrix. TEM observations reveal that the sizes of the precipitates decrease with increasing distance from the interface and thus confirms the retardation in aging kinetics with increasing distance from the interface.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2773 - 2778
Copyright
Copyright © Materials Research Society 1997

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