Seaweed to dendrite transition in directional solidification

Nikolas Provatas, Quanyong Wang, Mikko Haataja, Martin Grant

Research output: Contribution to journalArticle

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Abstract

We simulate directional solidification using a phase-field model solved with adaptive mesh refinement. For small surface tension anisotropy directed at 45° relative to the pulling direction we observe a crossover from a seaweed to a dendritic morphology as the thermal gradient is lowered, consistent with recent experimental findings. We show that the morphology of crystal structures can be unambiguously characterized through the local interface velocity distribution. We derive semiempirically an estimate for the crossover from seaweed to dendrite as a function of thermal gradient and pulling speed.

Original languageEnglish (US)
JournalPhysical review letters
Volume91
Issue number15
DOIs
StatePublished - Jan 1 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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