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Simulation of defect nucleation in a crystal

Author

Listed:
  • Andrew Gouldstone

    (Massachusetts Institute of Technology
    Harvard School of Public Health)

  • Krystyn J. Van Vliet

    (Massachusetts Institute of Technology)

  • Subra Suresh

    (Massachusetts Institute of Technology)

Abstract

Nanoindentation is the penetration of a surface to nanometre depths using an indenting device. It can be simulated using the Bragg bubble-raft model1, in which a close-packed array of soap bubbles corresponds to the equilibrium positions of atoms in a crystalline solid. Here we show that homogeneous defect nucleation occurs within a crystal when its surface roughness is comparable to the radius of the indenter tip, and that the depth of the nucleation site below the surface is proportional to the half-width of the contact. Our results may explain the unusually high local stress required for defect nucleation in nano-indented face-centred cubic crystals.

Suggested Citation

  • Andrew Gouldstone & Krystyn J. Van Vliet & Subra Suresh, 2001. "Simulation of defect nucleation in a crystal," Nature, Nature, vol. 411(6838), pages 656-656, June.
    • Handle: RePEc:nat:nature:v:411:y:2001:i:6838:d:10.1038_35079687
    DOI: 10.1038/35079687
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