Effect of cyclic plasticity on internal stresses in a metal matrix composite

M. R. Daymond, M. E. Fitzpatrick

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Neutron diffraction has been used to measure the elastic strains in a silicon carbide particle-reinforced aluminum alloy during cyclic plasticity. Strains were recorded in both phases of the material, in sufficient directions to allow for calculation of the internal stresses. The shape misfit stress in the composite was calculated from the macroscopic stress data using an Eshelby-based model. Changes in the misfit stress caused by plastic deformation can be clearly observed. Local plastic anisotropy of the matrix material is also seen and was monitored by comparing results from the two diffraction planes, {111} and {200}, that were measured. The results have been compared to those obtained using an elasto-plastic self-consistent modeling approach, which shows the evolution of load sharing between the matrix and reinforcement, as well as the origin of the plastic anisotropy strains in the aluminum.

Original languageEnglish
Pages (from-to)1977-1986
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume37
Issue number6
DOIs
Publication statusPublished - 1 Jan 2006
Externally publishedYes

Fingerprint

metal matrix composites
plastic anisotropy
plastic properties
residual stress
Plasticity
Residual stresses
Metals
Plastics
Composite materials
Anisotropy
matrix materials
Neutron diffraction
reinforcement
Aluminum
Silicon carbide
silicon carbides
aluminum alloys
plastic deformation
neutron diffraction
Aluminum alloys

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

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AB - Neutron diffraction has been used to measure the elastic strains in a silicon carbide particle-reinforced aluminum alloy during cyclic plasticity. Strains were recorded in both phases of the material, in sufficient directions to allow for calculation of the internal stresses. The shape misfit stress in the composite was calculated from the macroscopic stress data using an Eshelby-based model. Changes in the misfit stress caused by plastic deformation can be clearly observed. Local plastic anisotropy of the matrix material is also seen and was monitored by comparing results from the two diffraction planes, {111} and {200}, that were measured. The results have been compared to those obtained using an elasto-plastic self-consistent modeling approach, which shows the evolution of load sharing between the matrix and reinforcement, as well as the origin of the plastic anisotropy strains in the aluminum.

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