On the core width and Peierls stress of bubble rafts dislocations within the framework of modified Peierls-Nabarro model |
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Authors: | Xiaozhi Wu Lili Liu Rui Wang and Na Ji |
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Institution: | (1) Laboratoire de Structure et Propri?t?s de l’Etat Solide, UMR CNRS 8008, Universit? des Sciences et Technologies de Lille, Bat C6, 59655 Villeneuve d’Ascq Cedex, France; |
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Abstract: | Using Foreman’s method, the core structure and Peierls stress of dislocations in bubble rafts have been investigated within
the framework of the modified Peierls-Nabarro (P-N) model in which the discrete lattice effect is taken into account. The
core width obtained from the modified P-N model is much wider than that from the P-N model owing to the discrete lattice effect.
It is found that the core width of dislocation increases with a decrease of the bubble radius. The elastic strain energy associated
with the discrete effect is considered while calculating the Peierls stress. The new expression of the Peierls stress obtained
in this paper is not explicitly dependent on the particular form of the restoring force law, which is only related to the
core structure parameter and can be used expediently to predict the Peierls stress of dislocations. The Peierls stress decreases
rapidly with the decrease of the bubble radius. |
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Keywords: | |
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