Mechanism for the development of anisotropic grain boundary character distributions during normal grain growth

Shen J. Dillon, Gregory S. Rohrer

Research output: Contribution to journalArticlepeer-review

Abstract

Grain boundaries in polycrystalline magnesia-doped alumina and yttrium aluminum garnet were classified as growing in area or shrinking in area on the basis of topology and curvature considerations. Measurements of dihedral angles at grain boundary thermal grooves were used to determine that the energies of the growing boundaries are, on average, lower than the energies of the shrinking boundaries. The observations also show that the length of a boundary is inversely correlated to its energy. The findings suggest that anisotropic grain boundary character distributions, which influence the properties of polycrystals, develop because higher-energy grain boundaries are preferentially eliminated from the network during grain growth.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalActa Materialia
Volume57
Issue number1
DOIs
StatePublished - Jan 2009
Externally publishedYes

Keywords

  • Grain boundaries
  • Grain boundary energy
  • Grain boundary migration
  • Misorientation

ASJC Scopus subject areas

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

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