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Solute trapping in rapid solidification

Published online by Cambridge University Press:  10 November 2020

Tatu Pinomaa ,
Anssi Laukkanen  and
Nikolas Provatas
Tatu Pinomaa
Affiliation:
VTT Technical Research Centre of Finland Ltd., Finland; [email protected]
Anssi Laukkanen
Affiliation:
VTT Technical Research Centre of Finland Ltd., Finland; [email protected]
Nikolas Provatas
Affiliation:
McGill University, Canada; [email protected]
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Abstract

Rapid solidification gives rise to solute trapping, which decreases solute partitioning and alters equilibrium solidification velocity-undercooling relationships. These effects influence microsegregation, solidification morphology, and the emergent microstructure length scales. Here, we review solute trapping and solute drag in rapid solidification in terms of theory, simulation methods, and experimental techniques. The basic theory to describe solute trapping is contained in the continuous growth model. This model breaks down at high solidification velocities, where solidification transitions abruptly to complete trapping, a limit that can be captured with the local nonequilibrium model. Solute trapping theories contain unknown parameters. Their determination from atomistic simulations or pulsed laser melting experiments is discussed. Microstructural evolution in rapid solidification can be readily investigated with the phase-field method, various alternatives of which are presented here. Uncertainties related to kinetic parameters and heat transfer during rapid solidification can be studied by comparing phase-field simulations to dynamic transmission electron microscopy observations.

Type
Processing Metallic Materials Far from Equilibrium
Information
MRS Bulletin , Volume 45 , Issue 11: Processing Metallic Materials Far from Equilibrium , November 2020 , pp. 910 - 915
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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