Accession Number:

AD0641126

Title:

SURFACE OXIDE FILMS AND THE LIFE TIME OF VACANCIES IN THIN CRYSTALS,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s):

• EIKUM,A.
• Thomas,G.

Report Date:

1966-08-01

Pagination or Media Count:

15.0

Abstract:

During annealing experiments in the electron microscope, prismatic dislocation loops and helices have been observed to grow in thin foils prepared from quenched and aged samples of supersaturated aluminum-magnesium alloys. Growth in pure aluminum or dilute aluminum-magnesium alloys has not been reported. It has been suggested recently that the excess vacancies required for growth are residual quenched-in vacancies which were not able to sink at external surfaces due to the presence of an impervious oxide film. The oxide mechanism fails to account for the fact that growth has not been observed in pure aluminum and dilute aluminum alloys. This point and others concerning the life time of vacancies in thin crystals are discussed. Author

Descriptors:

• *CRYSTALS
• *FILMS
• CRYSTAL DEFECTS
• OXIDES
• SURFACES
• ALUMINUM ALLOYS
• MAGNESIUM ALLOYS
• ALUMINUM
• FOILS(MATERIALS)
• LIFE EXPECTANCY(SERVICE LIFE)
• ANNEALING

Subject Categories:

• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE