Artículo
Size of the Plastic Zone Produced by Nanoscratching
Fecha de publicación:
03/2018
Editorial:
Springer/Plenum Publishers
Revista:
Tribology Letters
ISSN:
1023-8883
e-ISSN:
1573-2711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Nanoscratching of ductile materials creates plastic zones surrounding the scratch groove. We approximate the geometry of these zones by a semicylinder with its axis oriented along the scratch direction. The radius and the length of the cylinder, as well as the length of the dislocations in the network created quantify the plasticity generated. Using molecular dynamics simulations, we characterize the plastic zones in six metals with fcc, bcc, and hcp crystal structures. We find that the plastic zone sizes after scratch are comparable to those after indent. Due to dislocation reactions, the dislocation networks simplify, reducing the total length of dislocations. As a consequence, the average dislocation density in the plastic zone stays roughly constant. Individually, we find exceptions from this simple picture. Fcc metals show strong plastic activity, which even increases during scratch. The hcp metals on the other side show the least plastic activity. Here the plasticity may be strongly reduced during scratch and particularly during tip withdrawal.
Palabras clave:
DISLOCATIONS
,
MOLECULAR DYNAMICS
,
NANOINDENTATION
,
PLASTICITY
,
SCRATCHING
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Identificadores
Colecciones
Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Citación
Alabd Alhafez, Iyad; Ruestes, Carlos Javier; Urbassek, Herbert M.; Size of the Plastic Zone Produced by Nanoscratching; Springer/Plenum Publishers; Tribology Letters; 66; 1; 3-2018; 1-12
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