Accession Number:

AD0423004

Title:

THE VARIATION IN THE STRUCTURE OF PREPRECIPITATION ZONES DURING AGING,

Descriptive Note:

Corporate Author:

PURDUE UNIV LAFAYETTE IND

Personal Author(s):

• James,Darrel Russell

Report Date:

1964-01-01

Pagination or Media Count:

82.0

Abstract:

The descriptions of preprecipitation zone structures in Al-Cu alloys have been rapidly changing since the early 1940s. Refinements in the method of obtaining data and treating such data have been the major reasons for these changes. In the present work, the diffuse X-ray intensity due to the zones in Al-3.85 wt Cu alloy aged at 130 C was obtained by a counter diffractometer method, and the Fourier transform of the amplitude was taken near the 200 A1 reciprocal lattice point. The observed electron density along with a truncation function expressing the limits of the measurements were used to find the actual electron density by a relaxation method. The numerical analysis in this work was programed for and processed on an IBM 7090 computer. Author

Descriptors:

• *ALUMINUM ALLOYS
• *COPPER ALLOYS
• AGING(MATERIALS)
• AGING(MATERIALS)
• CRYSTAL STRUCTURE
• X RAY DIFFRACTION
• CRYSTAL LATTICES
• HARDENING
• ELECTRON DENSITY
• FOURIER ANALYSIS
• THEORY
• COMPUTER PROGRAMMING

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE