Thermal expansion of isotropic Duralcan metal-matrix composites

S. Lemieux, S. Elomari, J. A. Nemes, M. D. Skibo

Research output: Contribution to journalArticlepeer-review

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Abstract

The thermal expansion behaviour of Duralcan composites having a matrix of hypoeutectic Al-Si alloy containing SiC reinforcements ranging from 10-40 vol% was investigated. The coefficient of thermal expansion (CTE) of the MMCs was measured between 25 and 350°C by a high-precision thermomechanical analyser, and compared to the predictions of three theoretical models. At low temperature, the experimental CTEs show substantial deviation from the predictions of the elastic analysis derived by Schapery, while the Kerner model agrees relatively well at high temperature. The overall measured CTE, in the range of 25-350°C, as a function of the volume fraction of SiC is well predicted using Schapery's lower bound. We interpret these features as being an effect of reinforcement phase geometry and the modified microstructure derived from the Duralcan process and subsequent heat treatments.

Original languageEnglish (US)
Pages (from-to)4381-4387
Number of pages7
JournalJournal of Materials Science
Volume33
Issue number17
DOIs
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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