Thermal non-equilibrium effects on nickel solid-liquid interface

Nicholas Brown, Enrique Martinez, Jianmin Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Rapid solidification of metallic structures results in complex microstructural changes originating from the rapid heating/cooling rates typically seen in manufacturing processes, such as additive manufacturing, cast and welding. These extreme rates cause a thermal non-equilibrium at the crystal-melt interface and affect the interfacial stiffness and energy of the system. Typical phase-field simulations of dendrite growth are limited to the assumption of thermal equilibrium, using the Gibbs-Thomson equation as a boundary condition. Under these assumptions, phase-field simulations are unable to accurately reproduce the growth patterns observed under rapid solidification. While recent advances have been made to overcome this deficiency within the phase-field simulation methodology, the work presented in this paper proposes an alternative molecular dynamics approach using a modified capillary fluctuation method. Solid-liquid interface properties are initially calculated under an equilibrium condition using the melting temperature and then compared results obtained from a range of non-equilibrium thermal conditions to quantify the effect caused by the thermal gradient. It is evident that the interfacial stiffness is no longer a function of just the normal orientation of the interface, thus requiring a change in the phase-field methodology.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
Pages359-366
Number of pages8
ISBN (Electronic)9781510833142
StatePublished - 2016
EventMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States
Duration: 23 Oct 201627 Oct 2016

Publication series

NameMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
Volume1

Conference

ConferenceMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
Country/TerritoryUnited States
CitySalt Lake City
Period23/10/1627/10/16

Keywords

  • Additive manufacturing
  • Interface free energy
  • Interfacial stiffness
  • Molecular dynamics
  • Non-equilibrium
  • Phase-field
  • Rapid solidification
  • Solid-liquid interface

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