Elastically deformed metallic glasses were submitted to perturbations consisting of small individual atom displacements. The response, studied by molecular dynamics, pointed out the existence of unstable regions in which displacements induce local rearrangements. The displacement length at which these occur decreases with strain. When it becomes comparable with the amplitude of atomic thermal vibrations, unstable regions rearrange also in the absence of perturbation. This suggests for the deformation-induced rearrangement of unstable regions a thermal activation mechanism.
Thermal activation of atomic rearrangements in elastically deformed Ni50Zr50 metallic glasses
DELOGU, FRANCESCO
2012-01-01
Abstract
Elastically deformed metallic glasses were submitted to perturbations consisting of small individual atom displacements. The response, studied by molecular dynamics, pointed out the existence of unstable regions in which displacements induce local rearrangements. The displacement length at which these occur decreases with strain. When it becomes comparable with the amplitude of atomic thermal vibrations, unstable regions rearrange also in the absence of perturbation. This suggests for the deformation-induced rearrangement of unstable regions a thermal activation mechanism.
I metadati presenti in IRIS UNICA sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono protetti da diritto d'autore, salvo diversa indicazione.
