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Eutectic growth in two-phase multicomponent alloys

Abstract : A theory of two-phase eutectic growth for a multicomponent alloy is presented. Using the same hypotheses as the Jackson-Hunt theory, we find that the growth law of the microstructure given by Jackson and Hunt for binary alloys can be generalized to systems with N elements. Thermodynamic parameters involved in this theory are linked to the Gibbs free energies of the phases which makes it possible to compute these parameters with CALPHAD tools. A model is derived from this general theory for ternary alloys which does not contain any assumptions on the alloy thermodynamic properties, contrary to previous models. We find that a small addition of a ternary alloying element with a small diffusivity to a binary alloy can significantly alter the spacing of the eutectic.
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Oriane Senninger, Peter W. Voorhees. Eutectic growth in two-phase multicomponent alloys. Acta Materialia, Elsevier, 2016, 116, pp.308-320. ⟨10.1016/j.actamat.2016.06.029⟩. ⟨hal-01518928⟩



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