Formation of surface roughness on nanocrystalline aluminum samples under straining by molecular dynamics studies

Aurelien Perron (1) , Olivier Politano (1) , Vincent Vignal (1)

1 LRRS - Laboratoire de Recherche sur la Réactivité des Solides

The surface roughening of nanocrystalline aluminum samples was investigated by molecular dynamics simulations. Attention was focused on the fact that roughness increases with the grain size and the strain. The elastic-plastic transition was found at around 3.5% strain and a reverse Hall-Petch effect was observed under straining conditions. Then, different strain distributions in grains and grain boundaries at the samples surface was highlighted, yielding to the formation of local roughness. Finally, a linear relationship between the magnitude of roughness and the out-of-plane strain component was found.

Mots clés: Physical Sciences

Aurelien Perron, Olivier Politano, Vincent Vignal. Formation of surface roughness on nanocrystalline aluminum samples under straining by molecular dynamics studies. Philosophical Magazine, 2006, 87 (01), pp.129-145. ⟨10.1080/14786430600936447⟩. ⟨hal-00513761⟩