Cleavage Surface Energy of {100} Magnesium Oxide

Abstract

The modification of the Gilman cleavage technique described recently by Westwood and Hitch has been used to determine the surface energy, of (100) MgO at 298 K. This was found to be 1150 = 80 ergs/sq cm, in good agreement with previous ex perimental estimates, but somewhat lower than theoretical estimates of this quantity. Metal lographic studies were also made of the plastic relaxation which occurs in the vicinity of the crack tip when cleavage cracks are repropagated, and a correlation between the extent of plastic relaxation, crack length and the measured cleavage surface energy was observed.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1963
Accession Number
AD0410089

Entities

People

  • A. R. Westwood
  • D. L. Goldheim

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Crack Tips
  • Cracks
  • Crystal Structure
  • Crystals
  • Energy
  • Engineering
  • Magnesium Compounds
  • Materials
  • Materials Laboratories
  • Military Research
  • Modulus Of Elasticity
  • Naval Architecture
  • New York
  • Nuclear Energy
  • Plastic Deformation
  • Surface Energy

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.