Abstract
A theory of glide velocity of a dislocation with narrow kinks which encounter spatially periodic, relatively high energy barriers is developed. The thermally activated generation of double kinks is considered as the mechanism of the dislocation movement. It is assumed that the saddle point is determined by the elastic interaction between the two kinks and that diffusion of the kinks is rate controlling. According to this theory velocities of screw dislocations in α-iron are calculated in dependence on temperature and the applied stress with 2E k =0·68 eV andΔE=0·07 eV (E k is the energy of an isolated kink,ΔE is the “second-order” Peierls energy). Relations to three other theories, which may be considsred for calculation of velocities of screw dislocations in b.c.c. metals are discussed and demonstrated by numerical calculations for iron. It appears that there are no serious objections suggested by experiments which might be raised against the screw dislocation velocities in iron calculated according to the presented theory.
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Blahovec, J., Šesták, B. Theory of the diffusive glide of dislocations with narrow kinks. Czech J Phys 26, 996–1010 (1976). https://doi.org/10.1007/BF01587447
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DOI: https://doi.org/10.1007/BF01587447