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Title: Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys
Authors: Feitosa, L. M.
D'Souza, N.
West, G. D.
Dong, Hongbiao B.
First Published: 22-May-2017
Publisher: Springer Verlag
Citation: Metallurgical and Materials Transactions A, 2017, 48 (8), pp. 3814-3822
Abstract: The freezing reaction sequence of Co-rich Nb-Al-Co ternary alloys with emphasis on the formation of Laves and Heusler phases has been examined. For Co-rich alloys, the solidification reaction sequence is observed as primary freezing of α-Co and CoAl phases, subsequent [Co + C36] and [CoAl + C36] eutectics, and the final ternary eutectic reaction [L → α-Co + C36 + CoAl]. The compositions of solidified α-Co and C36 phases agree with the corresponding vertices of the tie-triangle at the solidus temperatures. When the Nb concentration is over 20 at. pct in Co-rich alloys, the quasi-peritectic reaction [L + Co2AlNb → C36 + CoAl] does not occur as equilibrium prediction. The formation of C36 and CoAl phases occurs through solid precipitation and must be distinguished from a solidification reaction.
DOI Link: 10.1007/s11661-017-4138-2
ISSN: 1073-5623
eISSN: 1543-1940
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2017. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Engineering

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