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Molecular dynamics simulation of the solid-liquid interface migration in terbium.
Mendelev, M I; Zhang, F; Song, H; Sun, Y; Wang, C Z; Ho, K M.
Afiliação
  • Mendelev MI; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
  • Zhang F; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
  • Song H; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
  • Sun Y; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
  • Wang CZ; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
  • Ho KM; Division of Materials Sciences and Engineering, Ames Laboratory (US Department of Energy), Ames, Iowa 50011, USA.
J Chem Phys ; 148(21): 214705, 2018 Jun 07.
Article em En | MEDLINE | ID: mdl-29884043
ABSTRACT
We developed a Tb embedded atom method potential which properly reproduces the liquid structure obtained from the ab initio molecular dynamics simulation, the hexagonal close packed (hcp)-body-centered cubic (bcc) phase transformation, and melting temperatures. At least three crystal phases [hcp, face-centered cubic (fcc), and bcc] described by this potential can coexist with the liquid phase. Thus, the developed potential provides an excellent test bed for studies of the completive phase nucleation and growth in a single component system. The molecular dynamics simulation showed that all crystal phases can grow from the liquid phase close to their melting temperatures. However, in the cases of the hcp and fcc growth from the liquid phase at very large supercoolings, the bcc phase forms at the solid-liquid interface in the close packed orientations in spite of the fact that both hcp and fcc phases are more stable than the bcc phase at these temperatures. This bcc phase closes the hcp and fcc phase from the liquid such that the remaining liquid solidifies into the bcc phase. The initial hcp phase then slowly continues growing in expense of the bcc phase.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article