(1 2 0) AND (1 2 2) Monazite Deformation Twins

Abstract

Unusual features of (1 2 0) and (1 2 2) deformation twins in monazite (monoclinic LaPO4) are described and analyzed. These features are kinks and other irregularities in (1 2 0) twins, and V-shaped indentations on (1 2 0) and (1 2 2) twin planes. Twinning shear analysis suggests that the kinks area type II deformation twin mode with shear direction (n1) of 2 1 0. This complements previous analysis based on atom shuffling considerations. Shear strain compatibility requires extensive plastic deformation in the kink. The V-shaped inventions may be analogous to similar structures in b.c.c metal deformation twins. Deformation mechanisms that may be associated with these structures are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2003
Accession Number
ADA429472

Entities

People

  • Randall S. Hay

Organizations

  • Air Force Research Laboratory

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Boundaries
  • Composite Materials
  • Crystal Lattices
  • Crystallography
  • Crystals
  • Electron Microscopy
  • Government Procurement
  • Governments
  • Materials
  • Military Research
  • Plastic Deformation
  • Transmission Electron Microscopy
  • United States

Fields of Study

  • Geology

Readers

  • Geotechnical Engineering.
  • Powder metallurgy of Titanium alloys.
  • Reinforced Composite Materials