Accession Number:

AD0258632

Title:

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

Descriptive Note:

Corporate Author:

MATERIALS RESEARCH LAB UNIV OF CALIF BERKELEY

Personal Author(s):

• JOHNSON,LAWRENCE DAVID
• CORNET,I.

Report Date:

1961-05-01

Pagination or Media Count:

1.0

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

Descriptors:

• *MAGNESIUM COMPOUNDS
• *SINGLE CRYSTALS
• *SURFACE PROPERTIES
• CLEANING
• CREEP
• CRYSTAL LATTICES
• CRYSTALS
• DEFLECTION
• DEFORMATION
• FATIGUE(MECHANICS)
• FRACTURE(MECHANICS)
• OXIDES
• PLASTIC PROPERTIES
• STATISTICAL ANALYSIS
• STRESSES
• SURFACES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE