The role of chemical disorder and volume expansion in crystal-to-amorphous transitions: simulation results for NiZr

Vittorio Rosato, Carlo Massobrio

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Abstract

We report the results obtained in a molecular dynamics simulation study of the behavior of two different systems, NiZr2and Cu3Au, subjected to a chemical disordering process, under different thermodynamical conditions. We underline the relevant phenomena which, in the first case, trigger the onset of the crystal-to-amorphous transition but in the latter do not. We focus on the dominant role played by volume expansion and elastic softening as precursor effects on the onset of the transition. Finally we draw attention to the percolation model (C. Massobrio and V. Pontikis, Phys. Rev. B, 45 (1992) 2484) which correlates elastic instability to percolation of locally expanded regions located around the defects. © 1993.
Original languageEnglish
Pages (from-to)439 - 445
Number of pages7
JournalJournal of Alloys and Compounds
Volume194
Issue number2
DOIs
Publication statusPublished - 7 May 1993
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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