RAPID CRYSTALLIZATION OF AMORPHOUS CO-ZR AND FE-B CLOSE TO EUTECTIC COMPOSITIONS

Authors
FISCHER HE BRAUER S ZALUSKA A SUTTON M STROMOLSEN JO STEPHENSON GB
Citation
He. Fischer et al., RAPID CRYSTALLIZATION OF AMORPHOUS CO-ZR AND FE-B CLOSE TO EUTECTIC COMPOSITIONS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 179, 1994, pp. 396-400
Citations number
14
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
179
Year of publication
1994
Pages
396 - 400
Database
ISI
SICI code
0921-5093(1994)179:<396:RCOACA>2.0.ZU;2-1
Abstract
We present in situ time-resolved X-ray scattering data and transmissio n electron microscopy studies on ribbons of Co92Zr8 and Fe81.5B18.5. B oth systems exhibit a profound change as the crystallization temperatu re, and hence transformation rate, is raised. At low temperatures (hal f-time t1/2 for crystallization of the order of minutes), crystallizat ion occurs by eutectic growth of two crystalline phases; at high rates (t1/2 of the order of seconds) the mode changes to simultaneous polym orphic crystallization of the two phases, with no eutectic growth. It is suggested that the change of mode occurs when the temperature excee ds the glass transition temperature.