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Dislocation emission around nanoindentations on a (001) fcc metal surface studied by scanning tunneling microscopy
O Rodríguez de la Fuente1, J A Zimmerman, M A González
1Departamento de Física de Materiales, Universidad Complutense, Madrid 28040, Spain.
Physical Review Letters
|January 22, 2002
Abstract:
We present a combined study by scanning tunneling microscopy and atomistic simulations of the emission of dissociated dislocation loops by nanoindentation on a (001) fcc surface. The latter consist of two stacking-fault ribbons bounded by Shockley partials and a stair-rod dislocation. These dissociated loops, which intersect the surface, are shown to originate from loops of interstitial character emitted along the <110> directions and are usually located at hundreds of angstroms away from the indentation point. Simulations reproduce the nucleation and glide of these dislocation loops.