Microstructure, characterisation, and superplasticity of alumina/carbon nanocomposite

Authors: Bataille, A.; Crampon, J.; Duclos, R.

Source: British Ceramic Transactions, Volume 99, Number 1, January 2000 , pp. 43-46(4)

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Abstract:

A nanocomposite consisting of a fine grained alumina matrix and carbon nanoparticles was produced by hot pressing. Compressive deformation tests were performed on this material at T = 1400°C up to true strains of -70%. In all cases true strain rates of up to 2 × 10^-4 s^-1 corresponded to low flow stresses (<50 MPa). No cavitation was observed at grain boundaries and little microstructural changes were found to accompany the deformation. Grain boundary sliding accommodated by diffusional mechanisms contributed to the main part of deformation. It is shown that the deformation results are consistent with a diffusivity of the grain boundaries unaffected by the presence of the carbon nanoparticles. The effect of carbon particles lies primarily in a reduction in grain growth without increase in flow stress.

Document Type: Regular Paper

Affiliations: The Laboratoire de Structure et Propri�t�s de l'Etat Solide, Universit� des Sciences et Technologies de Lille, F-59 655 Villeneuve d'Ascq Cedex, ESA CNRS 8008, France

Publication date: 2000-01-01

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