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|Title:||Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys|
|Authors:||Feitosa, L. M.|
West, G. D.
Dong, Hongbiao B.
|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.|
|Rights:||Copyright © the authors, 2017. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), 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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|10.1007%2Fs11661-017-4138-2.pdf||Published (publisher PDF)||3.16 MB||Adobe PDF||View/Open|
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