A STUDY OF ALLOYING THEORY USING METASTABLE STRUCTURES.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0656051
Entities
People
- Hans Conrad
- Rolf Stoering
Organizations
- Franklin Institute