Tensile flow stress of ceramic particle-reinforced metal in the presence of particle cracking

R. Mueller, A. Rossoll*, L. Weber, M. A.M. Bourke, D. C. Dunand, A. Mortensen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A simplified model is proposed to quantify the effect of damage in the form of particle cracking on the elastic and plastic behaviour of particle-reinforced metal matrix composites under uniaxial tensile loading: cracked particles are simply replaced, in a mean-field model, with as much matrix. Pure aluminium reinforced with 44 vol.% alumina particles, tested in tension and unloaded at periodic plastic deformations, is analysed by neutron diffraction during each reloading elastic step, at 30%, 50%, 70% and 90% of the tensile flow stress. The data give the evolution of the elastic matrix strains in the composite and also measure the progress of internal damage by particle cracking. The test gives (i) the evolution of the in situ matrix flow stress, and (ii) the evolution of load partitioning during elastic deformation with increasing composite damage. Predictions of the present model compare favourably with relevant results in the literature, and with results from the present neutron diffraction experiments.

Original languageEnglish (US)
Pages (from-to)4402-4416
Number of pages15
JournalActa Materialia
Volume56
Issue number16
DOIs
StatePublished - Oct 2008

Keywords

  • Mean-field analysis
  • Neutron diffraction
  • Tensile behaviour
  • Two-phase materials
  • Variational estimate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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