Accession Number : AD0607721

Title :   RELATIONSHIP OF COMPOSITION TO LATTICE SPACINGS OF SINGLE PHASE ALLOYS.

Descriptive Note : Rept. for Aug 61-Aug 62,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Hartley,Craig S.

Report Date : SEP 1964

Pagination or Media Count : 14

Abstract : The relationship of average interatomic distances to composition in single-phase alloys is discussed in terms of a simplified equation. Sample calculations on existing data show that, within the precision of most composition and lattice parameter data, the probability of an i-j pair can be considered to be those of a random arrangement of atoms and the spacing of an ij pair for alloys of n components can be considered constant over a single phase field. Although this oversimplified picture is at variance with the physical situation as inferred from diffuse x-ray scattering measurements of short-range order and from thermodynamic data, it is felt that an equation of the form presented represents a more generally useful and precise relationship between lattice parameters and compositions of alloys than the generally used linear form of Vegard's Law.

Descriptors :   (*ALLOYS, CRYSTAL LATTICES), (*CRYSTAL LATTICES, ALLOYS), MATHEMATICAL ANALYSIS, PHASE STUDIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE