Role of strain compatibility in the cyclic deformation of copper bicrystals

P. Peralta, C. Laird

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [1̄49] (90° and 180°) twist boundaries and [1̄49]/[001] bicrystals, all with boundaries perpendicular to the tensile axis. A Grain Boundary Affected Zone (GBAZ), where multiple slip dominated, appeared when the boundaries developed compatibility stresses. Experiments showed that the behavior of macroscopically compatible bicrystals, 180° boundaries, is approximately similar to that of a monocrystal, whereas the fatigue responses of the other misorientations show a grain boundary effect, which increases the cyclic stress. The strain in each grain of the [1̄49]/[001] sample was measured separately. The plastic deformation in the adjacent crystals oscillated during initial hardening; finally, the soft grain carried approximately five times the plastic strain of the other grain.

Original languageEnglish (US)
Pages (from-to)3029-3046
Number of pages18
JournalActa Materialia
Issue number7
StatePublished - 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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