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Is There a Difference Between Dendrites of a Binary or a Ternary Alloy? Some Answers by Phase-Field Simulations

[+] Author Affiliations
Hermann-J. Diepers, Janin Eiken, Ingo Steinbach

ACCESS e.V., Aachen, Germany

Paper No. IMECE2002-32844, pp. 203-208; 6 pages
doi:10.1115/IMECE2002-32844
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 5
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3636-3 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Dendritic growth is best understood for pure substances growing into a uniformly supercooled environment. Under certain assumptions the standard growth theory can be applied to the directional growth of dendrites in a binary alloy. To apply the theory to technical multicomponent alloys so called ‘binary equivalent’ or ‘pseudo-binary’ models have been proposed. The basic question of ‘Is there a difference between dendrites of a binary or ternary alloy?’ has only partially been answered. A phase-field model applied to a ternary Fe-C alloy with a third fictive component will be used in this paper to compare ternary and binary equivalent phase-field simulations focussing on different component diffusivities. Results for directional dendritic solidification indicate negligible and relevant differences with respect to micro-segregation and micro-structure.

Copyright © 2002 by ASME

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