Forced chemical mixing in alloys driven by plastic deformation

S. Odunuga, Y. Li, P. Krasnochtchekov, P. Bellon, R. S. Averback

Research output: Contribution to journalArticlepeer-review

Abstract

Molecular dynamics simulations of forced atomic mixing in crystalline binary alloys during plastic deformation at 100 K are performed. Nearly complete atomic mixing is observed in systems that have a large positive heat mixing and in systems with a large lattice mismatch. Only systems that contained a hard precipitate in a soft matrix do not mix. The amount of mixing is quantified by defining a mean square relative displacement of pairs of atoms, σ2(R,t), that were initially separated by a distance R. Analysis of σ2(R,t) and visual inspection of the displacement fields reveal that forced mixing results from dislocation glide, and that it resembles the forced mixing of a substance advected by a turbulent flow. Consideration of σ2(R,t) also provides a rationalization of compositional self-organization during plastic deformation at higher temperatures.

Original languageEnglish (US)
Article number045901
JournalPhysical review letters
Volume95
Issue number4
DOIs
StatePublished - Jul 22 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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