TY - JOUR
T1 - Growth competition during columnar solidification of seaweed microstructures
T2 - Insights from 3-D phase-field simulations
AU - Ankit, Kumar
AU - Glicksman, Martin E.
N1 - Publisher Copyright:
© 2020, EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - Abstract.: The mechanisms by which interfacial instabilities instigate the growth of solidification patterns is a topic of longstanding interest. In columnar solidification of metallic melts, where the solid-liquid interfacial energy is anisotropic, evolving dendritic patterns compete depending on their relative misorientation. By contrast, organic “plastic crystals”, such as alloys based on succinonitrile, where the anisotropy in their solid-liquid interfacial energy is extremely weak, solidify forming seaweed patterns that typically exhibit little, if any, growth competition. We explore in this study mechanisms by which columnar solidification microstructures of binary alloys with low crystalline anisotropy compete. We adopt toward this end a validated Navier-Stokes multiphase-field approach to characterize the influence of grain misorientation, seed morphology, and melt advection on the growth competition. Simulated seaweed patterns indicate profound influences of all three factors, although characteristic solidification morphologies are observed to evolve depending on the melt flow intensity. Graphical abstract: [Figure not available: see fulltext.]
AB - Abstract.: The mechanisms by which interfacial instabilities instigate the growth of solidification patterns is a topic of longstanding interest. In columnar solidification of metallic melts, where the solid-liquid interfacial energy is anisotropic, evolving dendritic patterns compete depending on their relative misorientation. By contrast, organic “plastic crystals”, such as alloys based on succinonitrile, where the anisotropy in their solid-liquid interfacial energy is extremely weak, solidify forming seaweed patterns that typically exhibit little, if any, growth competition. We explore in this study mechanisms by which columnar solidification microstructures of binary alloys with low crystalline anisotropy compete. We adopt toward this end a validated Navier-Stokes multiphase-field approach to characterize the influence of grain misorientation, seed morphology, and melt advection on the growth competition. Simulated seaweed patterns indicate profound influences of all three factors, although characteristic solidification morphologies are observed to evolve depending on the melt flow intensity. Graphical abstract: [Figure not available: see fulltext.]
KW - Topical issue: Branching Dynamics at the Mesoscopic Scale
UR - http://www.scopus.com/inward/record.url?scp=85079808976&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85079808976&partnerID=8YFLogxK
U2 - 10.1140/epje/i2020-11940-5
DO - 10.1140/epje/i2020-11940-5
M3 - Article
C2 - 32086596
AN - SCOPUS:85079808976
SN - 1292-8941
VL - 43
JO - European Physical Journal E
JF - European Physical Journal E
IS - 2
M1 - 14
ER -