In the present study it was evaluated the diffusion radius of triple junctions of <111>
and <100> tilt boundaries in Ni, obtained by crystallization, depending on the content of free
volume. It is shown that diffusion in the area of triple junctions containing excess free volume
proceeds much more intense than in the case when the additional vacancies were not introduced
in the calculation block. In the <100> boundaries and junctions formed by them during
crystallization the free volume dissipated much more efficiently than in the junctions formed by
the <111> boundaries. For this reason the diffusion radius of the triple junction of <100>
boundaries at the introduction of 2 % conditional vacancies (about 3.5 Å) less than the radius of
the junction of <111> boundaries (4-5 Å).
Keywords: molecular dynamics; triple junction; grain boundary; tilt boundary; free volume; diffusion; diffusion canal; radius of triple junction.
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