Simulation of defect nucleation in a crystal

Andrew Gouldstone, Krystyn J. Van Vliet and Subra Suresh ()
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Andrew Gouldstone: Massachusetts Institute of Technology
Krystyn J. Van Vliet: Massachusetts Institute of Technology
Subra Suresh: Massachusetts Institute of Technology

Nature, 2001, vol. 411, issue 6838, 656-656

Abstract: 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.

Date: 2001
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DOI: 10.1038/35079687

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