Using Foreman’s method, the core structure and Peierls stress of dislocations in bubble rafts were investigated within the framework of the modified Peierls-Nabarro model in which the discrete lattice effect was taken into account. The core width obtained from the modified Peierls-Nabarro model was much wider than that from the Peierls-Nabarro model owing to the discrete lattice effect. It was found that the core width of dislocation increased with a decrease of the bubble radius. The elastic strain energy associated with the discrete effect was considered while calculating the Peierls stress. The new expression of the Peierls stress obtained in this paper was not explicitly dependent upon the particular form of the restoring force law, which was only related to the core structure parameter and could be used expediently to predict the Peierls stress of dislocations. The Peierls stress decreased rapidly with a decrease in bubble radius.

On the Core Width and Peierls Stress of Bubble Rafts Dislocations within the Framework of Modified Peierls-Nabarro Model. X.Wu, L.Liu, R.Wang, N.Ji: Central European Journal of Physics, 2011, 9[4], 1090-5