Model of Eutectic Transformation Involving Intermetallic Compound
Received date: 2020-09-18
Revised date: 2020-11-03
Online published: 2021-05-25
Supported by
National Natural Science Foundation of China(51971166);Science and Technology Program of Shaanxi Province(2016KJXX-87);Foundation of Shaanxi Provincial Department of Education(18JS050)
The classical eutectic growth theory, first developed by Jackson and Hunt in 1966, is simple and easy to use. However, the derivation of the classical model does not consider the model changes when one of the eutectic phases in transformation is an intermetallic compound. Moreover, the derivation of the model does not demonstrate the mathematical method to solve the diffusion equation and determine the Fourier coefficient, and without this, it is difficult to deeply understand and master the theoretical application. Based on the classical Jackson-Hunt theory, this study derives the eutectic growth model considering the compound phases and demonstrates the process involved in the solution of the diffusion equation to determine the solute distribution coefficient. The steps for using the model are supplemented and then the application methods of other similar models in eutectic transformations involving the compound phase are provided. The calculation of the model shows that under the same undercooling, the eutectic growth rate increases with the decrease of the compound phase concentration (CB). This parameter change compensates for the insufficient growth resistance of the compound phase owing to the small solute distribution coefficient. Therefore, the span of the eutectic phase diagram with the compound phase involved in the transition is narrowed; the smaller the solute partition coefficient of the eutectic phase, narrower is the phase diagram span.
Key words： solidification; eutectic growth; undercooling; growth velocity
Junfeng XU , Baodong ZHANG , Galenko Peter K . Model of Eutectic Transformation Involving Intermetallic Compound[J]. Acta Metall Sin, 2021 , 57(10) : 1320 -1332 . DOI: 10.11900/0412.1961.2020.00373
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