10.1007%2Fs11661-017-4138-2.pdf (3.09 MB)
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Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys

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journal contribution
posted on 26.04.2018, 15:02 by L. M. Feitosa, N. D'Souza, G. D. West, Hongbiao B. Dong
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.

History

Citation

Metallurgical and Materials Transactions A, 2017, 48 (8), pp. 3814-3822

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

VoR (Version of Record)

Published in

Metallurgical and Materials Transactions A

Publisher

Springer Verlag

issn

1073-5623

eissn

1543-1940

Copyright date

2017

Available date

26/04/2018

Publisher version

https://link.springer.com/article/10.1007/s11661-017-4138-2

Language

en