Eutectic growth in two-phase multicomponent alloys

Oriane Senninger; Peter W. Voorhees

doi:10.1016/j.actamat.2016.06.029

Eutectic growth in two-phase multicomponent alloys

Oriane Senninger^*, Peter W. Voorhees

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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.

Original language	English (US)
Pages (from-to)	308-320
Number of pages	13
Journal	Acta Materialia
Volume	116
DOIs	https://doi.org/10.1016/j.actamat.2016.06.029
State	Published - Sep 1 2016

Keywords

CALPHAD
Diffusion
Eutectic solidification
Multicomponent
Ternary alloys

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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title = "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.",

keywords = "CALPHAD, Diffusion, Eutectic solidification, Multicomponent, Ternary alloys",

author = "Oriane Senninger and Voorhees, {Peter W.}",

note = "Funding Information: This work has been supported by the Dow Corning Corporation (grant number: 4504951031) . We would like to thank Silver Akamatsu, Sabine Bottin-Rousseau and Stefan Poulsen for fruitful discussions. ",

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T1 - Eutectic growth in two-phase multicomponent alloys

AU - Senninger, Oriane

AU - Voorhees, Peter W.

N1 - Funding Information: This work has been supported by the Dow Corning Corporation (grant number: 4504951031) . We would like to thank Silver Akamatsu, Sabine Bottin-Rousseau and Stefan Poulsen for fruitful discussions.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - 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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KW - Eutectic solidification

KW - Multicomponent

KW - Ternary alloys

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