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Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing

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journal contribution
posted on 23.01.2017, 17:18 by N. D'Souza, L. M. Feitosa, G. D. West, N. G. Jones, H. B. Dong
The solidification sequence of Ta-rich Ta-Al-Fe alloys was examined under rapid freezing processes, arc melting and splat cooling techniques. It is found that loss of interfacial equilibrium results in an extended solubility of Al (up to 15 at. %) and a lower Fe content in primarily Ta phase (A2) in arc melted samples. Trapping of Al in the primary phase leads to a deviation of the solidification path from equilibrium prediction. When Al content is less than 10 at. % Al and Fe content is less than 4 at. % in the primary phase, the peritectic reaction, L + A2 → σ, is suppressed and instead the eutectic reaction, L → A2 + μ takes place following primary freezing. It is also found that under splat cooling conditions extended solute solubility occurs in μ phase formed via a eutectic reaction.

Funding

One of the authors (ND) would wish to acknowledge funding from the Accelerated Metallurgy Project, which is co-funded by the European Commission in the 7th Framework Programme (Contract NMP4-LA-2011-263206) and by the individual partner organisations. LMF would wish to thank CNPq for funding PhD study.

History

Citation

Journal of Alloys and Compounds, 2017, 698, pp. 433-441

Author affiliation

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

Version

AM (Accepted Manuscript)

Published in

Journal of Alloys and Compounds

Publisher

Elsevier

issn

0925-8388

eissn

1873-4669

Acceptance date

12/12/2016

Available date

13/12/2017

Publisher version

http://www.sciencedirect.com/science/article/pii/S0925838816340671

Language

en