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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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D'Souza, N., Feitosa, L. M., West, Geoffrey D., Jones, N. G. and Dong, H. B. (2017) Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing. Journal of Alloys and Compounds, 698 . pp. 375-383. doi:10.1016/j.jallcom.2016.12.149

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2016.12.149

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Abstract

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.

Item Type: Journal Article
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title: Journal of Alloys and Compounds
Publisher: Elsevier BV
ISSN: 0925-8388
Official Date: 25 March 2017
Dates:
DateEvent
25 March 2017Published
13 December 2017Available
12 December 2017Accepted
Volume: 698
Page Range: pp. 375-383
DOI: 10.1016/j.jallcom.2016.12.149
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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