Dislocation emission around nanoindentations on a (001) fcc metal surface studied by scanning tunneling microscopy and atomistic simulations.
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.
Rodríguez de la Fuente
O
O
Departamento de Física de Materiales, Universidad Complutense, Madrid 28040, Spain.
Zimmerman
J A
JA
González
M A
MA
de La Figuera
J
J
Hamilton
J C
JC
Pai
Woei Wu
WW
Rojo
J M
JM