Compatibility stresses in fatigued bicrystals: Dependence on misorientation and small plastic deformations

P. Peralta, C. Laird

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Compatibility stresses are calculated for twist boundaries about [149] and a "random" high angle boundary between a [149] grain and a [100] grain, assuming piecewise homogeneous elastic fields and copper as model material. The "in-plane" compatibility stresses produced by uniaxial tension perpendicular to the boundary are a strong function of the crystallography of the grains and their misorientation. The effects of small plastic strains via crystallographic slip are also studied for three particular misorientations ([149] 90° and 180° twist boundaries and the "random" misorientation) and the type and amount of slip close to the boundary predicted by minimizing the elastic energy and using experimental measurements of the axial component of the plastic strain. The predictions agree quite well with experimental observations of slip traces close to the boundaries of copper bicrystals with those misorientations tested under high cycle fatigue conditions.

Original languageEnglish (US)
Pages (from-to)5129-5143
Number of pages15
JournalActa Materialia
Volume45
Issue number12
DOIs
StatePublished - Dec 1997
Externally publishedYes

ASJC Scopus subject areas

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

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