Simulation of defect nucleation in a crystal
- 1 June 2001
- journal article
- Published by Springer Nature in Nature
- Vol. 411 (6838) , 656
- https://doi.org/10.1038/35079687
Abstract
Nanoindentation is the penetration of a surface to nanometre depths using an indenting device. It can be simulated using the Bragg bubble-raft model, 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.Keywords
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