Surface instability and dislocation nucleation in strained epitaxial layers

Trushin, Oleg; Granato, Enzo; Ying, S. C.; Kosterlitz, J; Ala-Nissilä, Tapio; Salo, Petri

doi:10.1590/s0103-97332002000200034

Cited by 2 publications

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“…In epitaxially-grown thin films, misfit induces a strain and can lead to the formation of dislocations at interfaces [13,14,15]. The presence of defects in a surface, such as steps, terraces or hillocks, can also initiate plasticity [16].…”

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Effects of temperature and surface step on the incipient plasticity in strained aluminium studied by atomistic simulations

et al. 2007

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Atomistic simulations using an EAM potential are carried out to investigate the first stages of plasticity in aluminum slabs, in particular the effect of both temperature and step geometry on the nucleation of dislocations from surface steps. Temperature is shown to significantly reduce the elastic limit, and to activate the nucleation of dislocation half-loops. Twinning occurs by successive nucleations in adjacent glide planes. The presence of a kinked step is shown to have no influence on the nucleation mechanisms.

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Effects of temperature and surface step on the incipient plasticity in strained aluminium studied by atomistic simulations

et al. 2007

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“…[7][8][9] Finally, in epitaxially grown thin films, the strain induced by lattice mismatch can lead to the formation of dislocations at interfaces. [10][11][12] In the case of free surfaces, defects such as steps, terraces, or hillocks, have been experimentally observed to be favored places for the formation of dislocations, 13 a likely explanation being that they can locally concentrate the strain. However, experiments can hardly provide information at the smallest scales involved in the very beginning of the dislocation nucleation.…”

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Determination of activation parameters for dislocation formation from a surface in fcc metals by atomistic simulations

et al. 2008

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Defects in free surfaces are expected to be seeds for the nucleation of dislocations, which is the likely way nanoscale materials suffer plastic deformation. The nucleation results in the competition between the image force attracting the dislocation to the surface and the applied strain. In this work, two methods based on molecular dynamics simulations using an embedded atom method ͑EAM͒ potential are used to determine the activation energy and the critical radius for the formation of dislocations from a surface defect in a typical fcc metal.

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Surface instability and dislocation nucleation in strained epitaxial layers

Cited by 2 publications

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Effects of temperature and surface step on the incipient plasticity in strained aluminium studied by atomistic simulations

Effects of temperature and surface step on the incipient plasticity in strained aluminium studied by atomistic simulations

Determination of activation parameters for dislocation formation from a surface in fcc metals by atomistic simulations

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