Accession Number : AD0656051

Title :   A STUDY OF ALLOYING THEORY USING METASTABLE STRUCTURES.

Descriptive Note : Final rept. 1 Jun 66-1 Jun 67,

Corporate Author : FRANKLIN INST RESEARCH LABS PHILADELPHIA PA

Personal Author(s) : Stoering,Rolf ; Conrad,Hans

Report Date : JUN 1967

Pagination or Media Count : 73

Abstract : The phases and structures of liquid quenched and vapor quenched Cu-Ag alloys and liquid quenched Cu-Zn alloys were investigated by x-ray and electron diffraction and by electron transmission microscopy. For the Cu-Ag alloys a single phase FCC random solid solution with a maximum deviation of about +1% from Vegard's law was only obtained for the thinnest regions (1000-3000 A) with a substrate temperature of -150 C. For the thicker regions and for higher substrate temperatures, segregated silver-rich FCC phases designated gamma double prime and alpha prime were obtained. The copper-rich beta prime phase was only observed for the highest substrate temperature of 50 C. A new hexagonal phase termed delta was found in very slight amounts in the liquid quenched Cu-Ag alloys. For the Cu-Zn alloys, the solubility of zinc in the alpha phase was increased to 48% by liquid quenching. Annealing of liquid quenched Cu50Ag50 alloys indicated the following sequence for the decomposition of the metastable phases: gamma prime (random) to gamma double prime (spinodal) to alpha prime (spinodal) to alpha prime + beta prime to alpha + beta (equilib.). (Author)

Descriptors :   (*COPPER ALLOYS, PHASE STUDIES), ZINC ALLOYS, SILVER ALLOYS, QUENCHING, DIFFRACTION ANALYSIS, ELECTRON MICROSCOPY, HEAT TREATMENT, DECOMPOSITION, CHEMICAL PRECIPITATION, PHASE DIAGRAMS, ANNEALING, METALLURGY

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE