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In the work, the mutual tension of tilt grain boundaries with disorientation axes <111>
and <100> in a triple junction on the example of nickel is investigated by the molecular dynamics
method. The ratio of the boundary tensions found in the molecular dynamics model is compared
with the ratio calculated using the Yang relation through the ratio of grain boundary energies. It is
shown that both methods give close values. In addition, it was found that the elongation or
contraction of low-angle tilt boundary at the triple junction motion is accompanied by the
formation of zigzag displacements of atoms, which apparently appear due to the splitting and
sliding of grain-boundary dislocations. The formation of new geometrically necessary dislocation
during the boundary elongation occurred, as a rule, in the triple junction or in an already existing
grain-boundary dislocation.
Keywords: molecular dynamics; triple junction; grain boundary; boundary migration; triple junction migration; boundary energy; boundary tension; tilt boundary. |
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