Anomalous glass-forming ability of uranium-based alloys

Autor:	A.J. Drehman, S.J. Poon
Rok vydání:	1985
Předmět:	Materials science Amorphous metal Metallurgy chemistry.chemical_element Thermodynamics Liquidus Uranium Condensed Matter Physics Electronic Optical and Magnetic Materials Nickel chemistry Materials Chemistry Ceramics and Composites Melting point Melt spinning Cobalt Eutectic system
Zdroj:	Journal of Non-Crystalline Solids. 76:321-332
ISSN:	0022-3093
DOI:	10.1016/0022-3093(85)90008-0
Popis:	Using a melt spinning technique glassy UCo alloys were produced over the range 10–58 at.% cobalt. Glassy UFe and UNi alloys were also produced containing as little as 14.3% iron or nickel. Metallic glass formation at concentrations as low as 10% of the smaller atoms is unusual and particularly so in the case of these uranium alloys; this is because their composition is far from the eutectic composition (34% for UCo) and the corresponding equilibrium liquidus temperature is closer to the melting point of pure uranium than to the eutectic temperature. Based on X-ray diffraction data on a series of UCo glasses, a qualitative structural model is proposed which predicts that glass formation becomes much more difficult as the cobalt concentration decreases below 14%. Calorimetric and diffraction data together imply that the equilibrium phase diagram cannot be used as a guide for judging glass formability in the case of uranium-based metallic glasses.
Databáze:	OpenAIRE
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