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Journal of Materials Science
Published in: Journal of Materials Science 13/2016

04-04-2016 | Original Paper

Metastable Co23B6 phase solidified from deeply undercooled Co79.3B20.7 alloy melt

Authors: X. X. Wei, W. Xu, J. L. Kang, M. Ferry, J. F. Li

Published in: Journal of Materials Science | Issue 13/2016

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Abstract

M23X6 (M-transition metal, X-nonmetal) phases widely exist in alloy steels and some other multicomponent alloys, but were seldom solidified from binary alloys. In the present work, the alloy melt with the nominal composition of Co23B6 phase, Co79.3B20.7, was undercooled to different degrees, and metastable Co23B6 phase was solidified at undercooling beyond 60 K owing to its lower energy barrier to nucleation than the equilibrium Co3B phase. The Co23B6 phase formed at high temperature can be retained to room temperature if the cooling rate is larger than 25 K min−1. This phase was confirmed to be the classic Cr23C6-type structure (space group \( {\text{Fm}}\bar{3}{{\rm m}} \)) with a lattice parameter, measured by Rietveld refinement method, of a = 10.4912(1) Å.
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Metadata
Title
Metastable Co23B6 phase solidified from deeply undercooled Co79.3B20.7 alloy melt
Authors
X. X. Wei
W. Xu
J. L. Kang
M. Ferry
J. F. Li
Publication date
04-04-2016
Publisher
Springer US
Published in
Journal of Materials Science / Issue 13/2016
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-016-9941-4

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