Paper Title:
Influence of Liquid-Glass Transition on Diffusion and Nucleation in Computer-Simulated Iron
  Abstract

A molecular dynamic model for instantaneously undercooled iron melt has been applied to model the isothermal annealing of the stable percolation clusters. They contain mutual penetrating and contacting icosahedra with atoms at the vertices and centers. Such stable clusters form only below the critical temperature Tg ~1180 K. We identify Tg as the glass transition temperature. It is established that the time when a homogeneous nucleation starts is minimal for Tg. The stable icosahedral percolation clusters do not form above Tg. The proposed quantitative model describes the atomic mobility in metal glasses, where root-mean-square atomic displacement is the sum of contributions from both linear (Einsteinian) and logarithmic terms, associated to irreversible structure relaxation. The activation parameters of the model change abruptly at the icosahedral percolation transition.

  Info
Periodical
Edited by
B.S. Bokstein and B.B. Straumal
Pages
97-104
DOI
10.4028/www.scientific.net/DDF.249.97
Citation
A. V. Evteev, A.T. Kosilov, E. V. Levchenko, O.B. Logachev, "Influence of Liquid-Glass Transition on Diffusion and Nucleation in Computer-Simulated Iron", Defect and Diffusion Forum, Vol. 249, pp. 97-104, 2006
Online since
January 2006
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