Abstract
The kinetics of the spreading of electron diffraction contrast from extrinsic grain boundary dislocations (EGBDs) is studied in terms of the dissociation model. For the spreading time an equation similar to those given by Lojkowski-Grabski (W. Lojkowski and M.W. Grabski, in Deformation of Polycrystals: Mechanisms and Microstructures, edited by N. Hansen, A. Horswell, T. Leffers, and H. Lilholt (RisØ Nat. Lab., Roskilde, Denmark, 1981), p. 329.) and Johannesson-Thölen (T. Johannesson and A. Thölen, Metal Sci. J. 6, 189 (1972).) formulae is obtained, but with a much less numeric coefficient which is approximately equal to the coefficient calculated in the incorporation model (A.A. Nazarov, A.E. Romanov, and R.Z. Valiev, Scripta Metall. Mater. 24, 1929 (1990).). A comparison with experimental data shows that the new equation describes the spreading kinetics better than the common formulae.
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Nazarov, A. A Revision of the Models for the Accommodation of Extrinsic Grain Boundary Dislocations. Interface Science 8, 71–76 (2000). https://doi.org/10.1023/A:1008787404947
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DOI: https://doi.org/10.1023/A:1008787404947