Capillary-mediated solid-liquid energy fields

Their detection with phase-field method

M. Glicksman, Kumar Ankit

Research output: Contribution to journalConference article

Abstract

Observations of melting crystallites in microgravity showed unusual shape changes as melting proceeded toward extinction. When re-analyzed in 2011, shape evolution data showed needle-like crystallites becoming spheroids as they melted toward extinction, suggesting that some type of capillary phenomenon at solid-liquid interfaces was responsible for an energy release capable of spherodising particles on melting, and stimulating pattern formation during unstable crystal growth. The presence of these previously undetected energy fields was recently uncovered using phase-field simulations that employ an entropy density functional. Simulations allow measurement of interfacial energy distributions on equilibrated solid-liquid interfaces configured as stationary grain boundary grooves (GBGs). Interfacial energy source fields - related to gradients in the Gibbs-Thomson temperature - entail persistent cooling along GBG profiles, a new result that fully confirms earlier predictions based on sharp-interface thermodynamics. This study also provides new insights to improve microstructure control at reduced scales by explaining the thermodynamic fields responsible for pattern formation in castings.

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Melting
Crystallites
Interfacial energy
Grain boundaries
Liquids
Thermodynamics
Microgravity
Crystallization
Crystal growth
Needles
Entropy
Cooling
Microstructure
Temperature
Castings

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Capillary-mediated solid-liquid energy fields : Their detection with phase-field method. / Glicksman, M.; Ankit, Kumar.

In: IOP Conference Series: Materials Science and Engineering, Vol. 529, No. 1, 012027, 17.06.2019.

Research output: Contribution to journalConference article

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