Accession Number:

AD0686661

Title:

DISLOCATION PIPE DIFFUSION IN SILVER SINGLE CRYSTALS,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1969-03-25

Pagination or Media Count:

14.0

Abstract:

A chemical sectioning technique was developed for the measurement of self diffusion in silver at low temperatures. Silver was chosen because of its well-established high-temperature behavior, and because of the availability of the long-lived isotope Ag110. Layers of 100A or less are removed by an iodine reaction, and diffusion coefficients D as low as 2 x 10 to the minus 17th power sq cmsec have been measured. A large enhancement over extrapolated high-temperature values, which has been observed below T sub m2, is attributed to dislocation short circuiting. Determination of the pipe diffusion coefficient at the lowest measured temperature, where Harrisons type C kinetics are expected to apply, yields good agreement with the pipe diffusion coefficients D sub p calculated from published data obtained by another technique. Author

Subject Categories:

  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE