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Regarding the effect of aging heat treatment on the failure behaviour of a SiC reinforced Al based metal matrix composite

Gupta, M and Surappa, MK and Qin, S and Tham, LM (1998) Regarding the effect of aging heat treatment on the failure behaviour of a SiC reinforced Al based metal matrix composite. In: Indian Journal of Engineering and Materials Sciences, 5 (1). pp. 1-8.

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In the present study, 6061 Al metallic matrix was reinforced by 12.2 wt% df SiC particulates using liquid metallurgy route. The composite material thus obtained was extruded and characterized in the as-solutionized and peak aged conditions in order to delineate the effect of aging associated precipitation of secondary phases on the tensile fracture behavior of the composite samples. The results' of microstructural characterization studies carried out using scanning electron microscope revealed the increased presence of precipitated secondary phases in the metallic matrix and a more pronounced interfacial segregation of alloying elements in case of peak aged samples when compared to the as-solutionized samples. The results of the fractographic studies conducted on the as-solutionized samples revealed that the failure was dominated by the SiC particulates cracking while for the peak aged samples the fracture surface revealed a comparatively more pronounced SiC/6061 Al debonding and reduced SiC particulates cracking. This change in the failure behavior was rationalized in terms of embrittlement of the interfacial region brought about by the aging heat treatment and is correlated, in addition, with the mechanical properties of the composite samples in as-solutionized and peak aged conditions.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to National Institute of Science Communication and Information Resources.
Keywords: Composite material;Heat treatment;Rupture;Dispersion strengthened metal;Ageing;Precipitation;Cracking; Microstructure;Interface phenomena;SEM;Fractography; Segregation;Aluminium base alloys;Silicon carbide; Experimental study.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Ms Mary Ranjeetha
Date Deposited: 29 Jun 2011 07:50
Last Modified: 29 Jun 2011 07:50
URI: http://eprints.iisc.ac.in/id/eprint/38653

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