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Stress-induced interaction of pairs of point defects in bcc solutions

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Abstract

The theory of the stress-induced interaction1 has been used to calculate the interaction energies of interstitials, vacancies as well as interstitials and vacancies, and host atom displacements around a vacancy and interstitial in four metals with the bcc lattice: aFe, V, Nb, and Ta. The cases of interstitial location both in octahedral and tetrahedral interstices are discussed. The elastic constants, cohesion energy (for vacancies), Born-Karman constant of the host lattice and coefficients of the concentration expansion of the solid solution lattice due to the interstitials are the numerical parameters of the theory. The computer calculation was carried out in the general form suitable for any interstitial in these four metals and specifically for the interstitial solutions H, O, N in V, Nb, Ta and C, and N in aFe. In the only case when the quantitative comparison of the calculated characteristics with the experimental one is possible (interaction of the vacancies with C in aFe), there is good agreement between calculated and observed values.

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Authors and Affiliations

  1. Institute for Machine Con- struction, Moscow

    M. S. Blanter

  2. Insti- tute of Crystallography, Academy of Sciences of the USSR, Moscow, USSR

    A. G. Khachaturyan (Professor)

Authors
  1. M. S. Blanter
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  2. A. G. Khachaturyan
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Blanter, M.S., Khachaturyan, A.G. Stress-induced interaction of pairs of point defects in bcc solutions. Metall Trans A 9, 753–762 (1978). https://doi.org/10.1007/BF02649784

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