On the core width and Peierls stress of bubble rafts dislocations within the framework of modified Peierls-Nabarro model

• Authors: Xiaozhi Wu , Lili Liu , Rui Wang , Na Ji
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

bubble rafts; dislocation; core structure

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 4
• Pages: 1090-1095

Dates

published

1 - 8 - 2011

online

30 - 4 - 2011

Contributors

author

Xiaozhi Wu

• Department of Physics and Institute for Structure and Function, Chongqing University, Chongqing, 400044, P. R. China

author

Lili Liu

• Department of Physics and Institute for Structure and Function, Chongqing University, Chongqing, 400044, P. R. China

author

Rui Wang

• Department of Physics and Institute for Structure and Function, Chongqing University, Chongqing, 400044, P. R. China

author

Na Ji

• Department of Physics and Institute for Structure and Function, Chongqing University, Chongqing, 400044, P. R. China

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Identifiers

DOI

10.2478/s11534-010-0146-1