A STUDY OF ALLOYING THEORY USING METASTABLE STRUCTURES.
Final rept. 1 Jun 66-1 Jun 67,
FRANKLIN INST RESEARCH LABS PHILADELPHIA PA
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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 Vegards 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
- Properties of Metals and Alloys