The influence of particle concentration on the high-temperature stress-strain behavior of metal-matrix composites

K. M. Murali, G. J. Weng

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A micromechanical theory is developed to predict the stress-strain relations of a particle-strengthened metal-matrix composite under a constant strain-rate. Based on the observation that both creep and plasticity are fundamentally rate processes, a set of constitutive equations which can account for the influence of particle size and concentration on the creep activity of the ductile matrix is used. The principle of stress transfer from the ductile matrix to the elastic inclusion during the incremental loading process is also established. The theory then allows one to consider both the metallurgical and the mechanics factors of particle strengthening and, by which, the increase of overall flow stress of the two-phase system under a constant strain-rate can be determined at a given volume fraction of particles. It is demonstrated, among others, that, for a rutile-cobalt system at 500 °C, the addition of a mere 5% of rutile particles can more than double the flow stress of the cobalt system under the same total strain-rate.

Original languageEnglish (US)
Pages (from-to)353-364
Number of pages12
JournalUnknown Journal
Volume4
Issue number4
DOIs
StatePublished - Sep 1993

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