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Titolo:
INSITU X-RAY-SCATTERING STUDIES OF POLYMORPHIC CRYSTALLIZATION OF METAL-BORON GLASSES
Autore:
BRAUER S; FISCHER HE; STROMOLSEN JO; SUTTON M; ZALUSKA A; STEPHENSON GB;
Indirizzi:
IBM CORP,THOMAS J WATSON RES CTR,DIV RES,POB 218 YORKTOWN HTS NY 10598 MCGILL UNIV,CTR PHYS MAT MONTREAL H3A 2T8 QUEBEC CANADA MCGILL UNIV,DEPT PHYS MONTREAL H3A 2T8 QUEBEC CANADA
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 18, volume: 47, anno: 1993,
pagine: 11757 - 11766
SICI:
0163-1829(1993)47:18<11757:IXSOPC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
S. Brauer et al., "INSITU X-RAY-SCATTERING STUDIES OF POLYMORPHIC CRYSTALLIZATION OF METAL-BORON GLASSES", Physical review. B, Condensed matter, 47(18), 1993, pp. 11757-11766

Abstract

Time-resolved x-ray scattering has been used to study the isothermal crystallization kinetics of the binary metal-boron glasses Co2B, Fe76B24, and Co3B, for crystallization times as short as almost-equal-to 1 s. For alloys which crystallize into a single phase, a simple model ofthe transformed volume fraction, based on steady-state homogeneous nucleation of crystallites which then grow at a constant rate, explains the results. There is no evidence for a transient in the nucleation. Aone-parameter fit to the slowest diffraction data allows volume fractions as small as 10(-4) to be measured. The observed crystallization kinetics agree well with calorimetric and resistivity measurements. Foreach alloy, the kinetics are well described by a single activation energy, even at the highest transformation rates. For alloys which crystallize into a single phase, the transformation curves can be scaled onto each other by renormalizing the transformation time. Comparisons are drawn between the behavior of these metal-metalloid glasses and previously studied metal-metal systems.

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Documento generato il 19/09/20 alle ore 15:01:47