Plastic flow in polycrystal states in a binary mixture

Toshiyuki Hamanaka, Hayato Shiba, Akira Onuki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Using molecular dynamics simulation, we examine the dynamics of sheared polycrystal states in a binary mixture composed of small and large particles in two dimensions. We vary the composition c of the large particles and the shear rate γ to realize changeovers among crystal, polycrystal, and glass. We find large stress fluctuations arising from sliding motions of the particles at the grain boundaries, which occur cooperatively to release the elastic energy stored. These stress fluctuations decrease as the system crosses over from polycrystal to glass. The dynamic processes are visualized with the aid of a sixfold angle αj (t) representing the local crystal orientation and a disorder variable Dj (t) representing a deviation from the hexagonal order for particle j.

Original languageEnglish
Article number042501
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume77
Issue number4
DOIs
Publication statusPublished - 2008 Apr 23
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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