Shear induced chemical mixing in heterogeneous systems

Yinon Ashkenazy*, Nhon Q. Vo, Daniel Schwen, Robert S. Averback, Pascal Bellon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

110 Scopus citations


Shear-induced mixing in heterogeneous Cu alloy systems was investigated by molecular dynamics simulation. Each system, which comprised a single spherical particle within a Cu matrix, was subjected to cyclical shearing events to high strains at 100 K. The particles investigated were Cu, Ag, Ni, Fe, Nb, and V. fcc particles were observed to undergo "superdiffusive" mixing with dislocations crossing the particle-matrix interface. The initial rate of mixing in these systems increased quadratically with particle radius. bcc particles showed different behaviors. For Nb and V dislocations did not cross into the particles and the initial rates of mixing increased linearly with particle radius. The Nb particles remained spherical but developed amorphous Cu-Nb shells at the particle-matrix interface. The V particle showed some faceting, but it too formed amorphous layers on non-facetted interfaces. The Fe particle behaved similarly to Nb and V particles initially, but more like fcc particles at high strains. The molecular dynamics results are compared with experimental observations.

Original languageAmerican English
Pages (from-to)984-993
Number of pages10
JournalActa Materialia
Issue number3
StatePublished - Feb 2012

Bibliographical note

Funding Information:
This work was supported under grant DOE LANL76604-001-10 which is part of the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center and funded by the US Department of Energy, Office of Science.


  • Copper alloys
  • Homogenization/solutionization
  • Molecular dynamics
  • Severe plastic deformation
  • Simulation


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