Accession Number:

AD0633052

Title:

PAIR CORRELATIONS IN LIQUID AND SOLID ALUMINUM.

Descriptive Note:

Technical rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY

Report Date:

1966-04-29

Pagination or Media Count:

37.0

Abstract:

Radial density functions were determined by x-ray diffraction for solid aluminum at 25, 325, and 655C and for liquid aluminum at 665 and 750C. The first ten coupling factors, averaged for the three temperatures, were 0.70, 0.73, 0.92, 0.90, 0.82, 0.83, 1.00, 0.96, 0.93, 0.93. The radial density functions of liquid aluminum at 665 and 750C were quite similar. Liquid aluminum has the same basic structure as liquid lead, but a different structure than liquid mercury. Comparisons with the random packing model showed that this model does not reproduce the details of the measured radial density function. A quasi-crystalline model, in which the radial density function of the solid is broadened and damped by the introduction of a cell size and liquid diffusive motions, agreed quite well with the experimental density function. A tunnel model, in which atoms move freely in tunnels arranged in a two-dimensional close-packed network also fitted quite well, but a large number of free parameters is required. Author

Subject Categories:

  • Metallurgy and Metallography
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE