Abstract
A dislocation glide mechanism at low temperatures is proposed. The mechanism is based on the inclusion of dynamic atomic displacements, i.e., those caused by nonadiabatic transitions of atoms in a crystal with a dislocation under action of an external force. The dynamic displacements initiate the instability of a rectilinear dislocation with respect to low-amplitude displacements during atomic vibrations. The instability development leads to the formation of a double kink and the dislocation displacement by one interatomic distance.
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ACKNOWLEDGMENTS
The authors are grateful to L.B. Zuev, P.P. Kaminskii, and E.E. Slyadnikov for their interest in our work and useful remarks.
Funding
The work was performed under the government statement of work for ISPMS Project No. III.23.1.2.
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Translated by Yu. Ryzhkov
APPENDIX
APPENDIX
The numerical solution of Eqs. (3), (4), and (6)–(8) was performed by an implicit scheme. We introduced dimensionless variables
The boundary conditions:
The initial conditions
The localized perturbations were given in the form
where Δη0 and Δq0 are the amplitudes, x0 is the initial position, ση, σq are the dispersions of the perturbations of variables η and q, respectively.
The stochastic perturbation Δq in each site of the calculation mesh was taken a random value in the range
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Khon, Y.A., Zapolsky, H. Dynamic Atomic Displacements and Athermal Dislocation Glide in Crystals. Phys. Solid State 62, 587–591 (2020). https://doi.org/10.1134/S1063783420040137
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DOI: https://doi.org/10.1134/S1063783420040137