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Phase-field simulation on the heteroepitaxial nucleation of (Fe,Co) solid solution on facet phase in undercooled liquid

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
577
Identifiers
DOI: 10.1016/j.jallcom.2013.06.188
Keywords
  • Heteroepitaxial Nucleation
  • Phase-Field Model
  • Nucleus Morphology

Abstract

Abstract The nucleation process of (Fe,Co) solid solution epitaxially grown on the primary phase (Si) has been investigated by the phase-field method in Fe-41 wt%Co alloy. The effects on nucleation by such factors as the crystal orientation of the primary phase, the undercooling, the interface thickness, the anisotropy factor, the effective deposition rate, and the phase-field variable of primary phase were analyzed in great details. The results show that the nucleus morphology on Si {111} crystal surface is more complete than those on Si {110} and Si {100}. At high undercooling, more defects form in the nucleus. When the ratio of the interface thickness to the capillary length is W0/d0=5, the nucleus contain the least defects. As the anisotropy coefficient increases, the interface disturbance of the nucleus is more complex. But when the anisotropy coefficient is ε=0.03, the interface disturbance is the minimal, and the nucleus morphology is the most integrated. The nucleation radius increases as the effective deposition rate rises from 2 to 7ML/s. When the phase-field variable of primary phase takes ϕS=0, the nucleus morphology is the most complete.

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