Accession Number : AD0710807

Title :   FIRST AND SECOND ORDER PHASE CHANGES IN SPLAT COOLED Au-Cd AND Au-Zn ALLOYS.

Descriptive Note : Technical rept.,

Corporate Author : POLYTECHNIC INC OF BROOKLYN N Y DEPT OF PHYSICAL AND ENGINEERING METALLURGY

Personal Author(s) : Ferraglio,Paul ; Mukherjee,K. ; Castleman,L. S.

Report Date : AUG 1969

Pagination or Media Count : 31

Abstract : X-ray diffraction, transmission electron microscopy and selected area electron diffraction studies were performed on splat cooled equi-atomic Au-Cd and Au-Zn alloys. A vertical shock-tube apparatus is used for splat quenching samples from various temperatures. A substantial increase in superlattice line intensities were observed for both alloys after splat cooling. This result was tentatively interpreted in terms of the formation of preferential sublattice vacancies. A new morphology and crystal structure of the martensitic phase in splat cooled Au-Cd alloy were observed and a periodically faulted martensite like phase was observed in a splat cooled 50 at.% Au-Zn alloy. Also observed in the splat cooled Au-Zn alloy was a hitherto unreported modulated structure. (Author)

Descriptors :   (*GOLD ALLOYS, PHASE STUDIES), CADMIUM ALLOYS, ZINC ALLOYS, COOLING, GRAIN STRUCTURES(METALLURGY)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE