Numerical Model of Rapidly Solidified Droplets of Al–33 Wt Pct Cu Eutectic Growth View Full Text


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Article Info

DATE

2021-11-22

AUTHORS

J. Valloton, A.-A. Bogno, M. Rappaz, H. Henein

ABSTRACT

Rapid solidification of Al–Cu droplets of eutectic composition was carried out using Impulse Atomization (a type of drop tube). Two distinct morphologies were observed: an irregular undulated eutectic assumed to form during recalescence, followed by a regular lamellar eutectic. The volume fraction of each morphology was measured and used to deduce the nucleation undercooling based on the hypercooling limit. A model of the eutectic solidification was developed assuming that the kinetics of the undulated and regular regions is the same and follows scaling laws established experimentally. The simulated solid fraction forming during recalescence matches the experimental undulated eutectic fraction. Furthermore, the heat balance confirms the adiabatic nature of the solidification during recalescence. Good agreement is found between the model and experimental measurements of lamellar spacing for the regular eutectic. However, the predicted spacing of the undulated eutectic is much lower than what is observed experimentally. This difference as well as the nature of this morphology is attributed to coarsening during the remaining of solidification of the very fine eutectic formed during recalescence. More... »

PAGES

460-469

References to SciGraph publications

  • 2019-01-01. Microstructure Solidification Maps for Al-10 Wt Pct Si Alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2017-08-14. Microstructural Quantification of Rapidly Solidified Undercooled D2 Tool Steel in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1982-02. Heat Flow during Rapid Solidification of Undercooled Metal Droplets in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1996-03. Nucleation-Controlled Solidification Kinetics in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2019-10-03. Scandium Effect on Undercooling and Dendrite Morphology of Al-4.5 Wt Pct Cu Droplets in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2001-08. The formation of lamellar-eutectic grains in thin samples in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2004-06. Overstability of lamellar eutectic growth below the minimum-undercooling spacing in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://scigraph.springernature.com/pub.10.1007/s11661-021-06504-1

    DOI

    http://dx.doi.org/10.1007/s11661-021-06504-1

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    https://app.dimensions.ai/details/publication/pub.1142733643


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