Abstract
The phenomenon of dynamic collective displacements of atoms in face-centered cubic crystals has been revealed using molecular dynamics method. This phenomenon plays an important role in the vacancy mechanism of diffusion. The vacancy mechanism is provided by the collision of two regions of collective atomic displacements that move a migrating atom and a vacancy toward each other. The collective thermal atomic displacements from crystal lattice sites occur as a result of the nonuniform momentum distribution of atoms according to the Maxwellian distribution. Owing to their statistical nature, the degree of correlation of the atomic displacements depends neither on the temperature nor on the interatomic interaction potential.
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Original Russian Text © G.M. Poletaev, M.D. Starostenkov, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 4, pp. 686–691.
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Poletaev, G.M., Starostenkov, M.D. Dynamic collective displacements of atoms in metals and their role in the vacancy mechanism of diffusion. Phys. Solid State 51, 727–732 (2009). https://doi.org/10.1134/S106378340904012X
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DOI: https://doi.org/10.1134/S106378340904012X