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Internal stress and mechanical deformation of Al and Al/Ni multilayered nanowires

par Hou, Marc ;Melikhova, Oksana
Référence Acta Materiala, 57, 2, page (453-465)
Publication Publié, 2009-01

Article révisé par les pairs

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Résumé :

Isothermal molecular dynamics is used to study the correlation between the spatial distribution of internal stress and mechanical deformation of a 6.7-nm-diameter Al nanowire with <1 0 0> axis is subjected to an external uniaxial stress. The stress-strain relationship is asymmetrical. In the case of a tensile load, the internal stress distribution is found to result from the interplay between structure and morphology. As a general rule, yielding nucleates where the internal stress gradient is the highest. If the Al wire is interfaced with a harder material-Ni in this study-the highest gradients occur at the interface, where a characteristic interfacial stress pattern is induced. Remarkably, compressive and tensile yield strengths are found to be unaffected by the hard/soft interfaces. The structure of the stress-strain relationship is found to correlate with identified discrete plastic events. These may be complex, involving interactions between partial dislocations, stacking faults, surfaces and interfaces, internal stress localization and release. © 2008 Acta Materialia Inc.