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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:698

Article

D'Souza, N.¹  Feitosa, L. M.²  West, G. D.³  Jones, N. G.⁴  Dong, B.² 

[1] Rolls Royce PLC, POB 31, Derby DE24 8BJ, England

[2] Univ Leicester, Dept Engn, Leicester LE1 7RH, Leics, England

[3] Univ Warwick, Warwick Mfg Grp, Coventry CV4 7AL, W Midlands, England

[4] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

关键词: Rapid solidification;    Metals and alloys;    Solute trapping;    Diffusion;    Phase transitions;    Phase diagrams;   

DOI  :  10.1016/j.jallcom.2016.12.149

来源: Elsevier

【 摘 要 】

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 -> sigma, is suppressed and instead the eutectic reaction, L -> A2 + mu takes place following primary freezing. It is also found that under splat cooling conditions extended solute solubility occurs in m phase formed via a eutectic reaction. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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