10.1007%2Fs11661-017-4138-2.pdf (3.09 MB)
Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys
journal contributionposted on 2018-04-26, 15:02 authored 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.
CitationMetallurgical and Materials Transactions A, 2017, 48 (8), pp. 3814-3822
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering
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