THE EFFECT OF SURFACE TREATMENT ON THE BENDING CHARACTERISTICS OF MGO SINGLE CRYSTALS

Abstract

As-cleaved specimens of MgO which were chemically polished in phosphoric acid, acetic acid, ammonium acetate, and distilled water exhibited on bending in air a sudden load drop phenomenon. This effect was believed to be associated with the removal of mobile surface dislocation halfloops by the environment. Specimens of MgO which were fatigue strained and then polished in phosphoric acid did not exhibit the load drop effect. Fatigue straining before polishing introduced many mobile dislocations which were not removed by polishing. Specimens of MgO which were alternately deflected 0.02 in. in bending and polished in phosphoric acid exhibited greater deflection than as-cleaved specimens. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1961
Accession Number
AD0258632

Entities

People

  • I. Cornet
  • Lawrence David Johnson

Organizations

  • Materials Research Laboratory

Tags

DTIC Thesaurus Topics

  • Acetic Acid
  • Acids
  • Crystals
  • Deflection
  • Dislocations
  • Environment
  • Phosphoric Acids
  • Polishing
  • Single Crystals
  • Surface Finishing

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Surface Coatings Technology.