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Thermodynamic aspects of grain growth restriction in multicomponent alloy solidification

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
59
Issue
15
Identifiers
DOI: 10.1016/j.actamat.2011.06.026
Keywords
  • Growth Restriction
  • Multicomponent Alloys
  • Thermodynamics
  • Casting
  • Grain Refinement
Disciplines
  • Physics

Abstract

Abstract The growth restriction factor Q is the key quantity in current descriptions of the solutal effect on grain growth and grain refinement during solidification of alloys. A rigorous treatment for the evaluation of Q in multicomponent alloys based on consistent thermodynamic descriptions of the alloy phase equilibria is presented. On closer inspection the conventional approach to calculate Q in multicomponent alloys from liquidus gradient m i and partition coefficient k i must fail for a wide range of common alloys exhibiting minute amounts of primary crystallizing intermetallic phase, exemplified for Mg–Al–Mn and Al–Si–Ti alloys. The rigorous approach provides an extension of the applicability range of the concept of Q. The qualitative similarity of inoculant particles and primary intermetallic phases is verified by calculations for Al–Si–Ti–B alloys.

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