Effect of carbon and oxygen impurity atoms on the migration rate of triple junctions of tilt boundaries in FCC metals
The effect of carbon and oxygen impurity atoms on the migration rate of triple junction of tilt boundaries with the <111> misorientation axis in fcc metals Ni, Ag, Al was studied by mean of molecular dynamics method. It is shown that the introduction of impurity atoms of light elements leads to a significant inhibition of the migration of triple junctions. The carbon atoms tend to form aggregates, which, being fixed at the grain boundaries, become effective stoppers that prevent the displacement of the boundaries. Oxygen atoms do not form aggregates, but because of the high values of the binding energy with the boundaries, they also effectively inhibit their migration. For impurity atoms of carbon and oxygen, the binding energies with grain boundary edge dislocations in the metals under consideration were calculated. The obtained values correlate well with the dependences of the migration rate of triple junctions on the concentration of impurities.
Keywords
молекулярная динамика,
тройной стык,
миграция,
граница зерен,
примесь,
molecular dynamics,
triple junction,
migration,
grain boundary,
impurityAuthors
| Poletaev G.M. | Altai State Technical University | gmpoletaev@mail.ru |
| Zorya I.V. | Siberian State Industrial University | zorya.i@mail.ru |
| Rakitin R.Y. | Altai State University | movehell@gmail.com |
| Semenov A.S. | Polytechnic Institute of North-Eastern Federal University | gmpoletaev@mail.ru |
| Starostenkov M.D. | Altai State Technical University | genphys@mail.ru |
Всего: 5
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