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- Title
Experimental study and thermodynamic modelling of the ternary Al-Fe-Ta system.
- Authors
Witusiewicz, V.; Bondar, A.; Hecht, U.; Voblikov, V.; Tsyganenko, N.; Fomichov, O.; Karpets, M.; Petyukh, V.; Velikanova, T.
- Abstract
In the present article, a thermodynamic description of the ternary Al-Fe-Ta system is proposed, being obtained by CALPHAD modelling based on assessed experimental information from literature and our own experimental results. Dedicated experiments were performed to complement literature data on phase equilibria and thermodynamic properties. As-cast and annealed samples were prepared and analysed by means of SEM/EDS, XRD, DTA and DSC techniques, as well as isoperibolic dissolution calorimetry. The experiments revealed that three binary phases have large ternary extensions: the C14 Laves phase based on TaFe dissolves up to about 56 at.% Al, the μ or D8 phase dissolves up to about 39 at.% Al and the σ phase based on TaAl dissolves up to 12 at.% Fe. The ternary ordered Heusler phase L2 (the MnCuAl crystal structure type) is modelled as a stable phase such that it forms through a second-order ordering process at 1122 K from the ordered B2 phase of composition TaFeAl involving the substitution of Al with Ta atoms and reaches TaFeAl stoichiometry at ambient temperatures. The elaborated thermodynamic description was applied to calculate selected phase equilibria as to provide a comparison between calculated and experimental results. The calculations are shown to reproduce reasonably the experimental data.
- Subjects
TERNARY system; ALUMINUM; PHYSICAL &; theoretical chemistry research; IRON; TANTALUM; TEMPERATURE measurements; TERNARY alloys; MATHEMATICAL models
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 1, p377
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-012-6755-x