Accession Number : AD0616277

Title :   LOCAL ORDER IN LIQUID ALLOYS,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Kaplow,Roy ; strong,S. L. ; Averbach,B. L.

Report Date : 11 MAY 1965

Pagination or Media Count : 35

Abstract : Although the complete measurement of the separate pair distribution functions in a liquid binary alloy requires three separate experiments utilyzing three different radiations, a significant amount of information can be obtained from single radiation experiments. Data and total distribution functions are presented for a series of goldtin alloys and pure tin. Interpolations between the experimental results for .5 gold and pure tin accurately reproduce the results for the intermediate AuSn2 and AuSn4 alloys. An interpolation between the .5 gold result and an estimate of the pure gold distribution function also matches accurately the positions of the oscillations in the distribution function of the 0.7 gold eutectic alloy. A comparison between the experimental distribution function for the .5 gold liquid and a quasi-crystalline model indicates that the atomic arrangements in the equiatomic alloy are similar to those in the solid compound. It therefore appears that the atomic arrangement characteristic of the congruently melting equiatomic compound is partially preserved at all compositions in the liquid, and that the supressed compounds do not play a significant role in determining the liquid distribution functions. (Author)

Descriptors :   (*LIQUID METALS, ATOMIC PROPERTIES), (*GOLD ALLOYS, X RAY DIFFRACTION), (*TIN ALLOYS, X RAY DIFFRACTION), EUTECTICS, INTERMETALLIC COMPOUNDS, CRYSTAL LATTICES, MELTING, OSCILLATION, STATISTICAL FUNCTIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE