Surface step effects on nanoindentation

Atomistic simulation is used to examine nanoindentation of a Au(111) crystal both near and far from a surface step. While the load needed to nucleate dislocations decreases significantly when indenting close to the step, the extent of the step's influence is not as great as seen experimentally....

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Bibliographic Details
Published in:Physical review letters 2001-10, Vol.87 (16), p.165507-165507, Article 165507
Main Authors: Zimmerman, J A, Kelchner, C L, Klein, P A, Hamilton, J C, Foiles, S M
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DISLOCATIONS
NUCLEATION
SHEAR
SIMULATION
SLIP
STACKING FAULTS
VECTORS
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Summary:Atomistic simulation is used to examine nanoindentation of a Au(111) crystal both near and far from a surface step. While the load needed to nucleate dislocations decreases significantly when indenting close to the step, the extent of the step's influence is not as great as seen experimentally. This behavior is explained by measuring the contact area from the simulation data. A new metric, the slip vector, shows material slip coinciding with the directions of a lowest unstable stacking fault barrier. The slip vector is used to calculate an atomic critical resolved shear stress, which is shown to be a good dislocation nucleation criterion.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.165507