Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium


  • Andriy Ostapovets Central European Institute of Technology – Institute of Physics of Materials (CEITEC IPM) Academy of Sciences of the Czech Republic, Žižkova 22, Brno, Czech Republic
  • Olena Vatazhuk B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv, 61103, Ukraine


Ключові слова:

Peierls barriers, edge and screw dislocation, interatomic potentials, dislocation core, magnesium.


Exact shape of Peierls barriers are calculated for <a> edge and screw dislocation gliding on basal and prismatic planes in magnesium by using of several popular interatomic potentials. Comparison of these potentials is performed in order to describe their abilities and limitations. Stability of different types of dislocation cores are analyzed as well as their mutual transformations during dislocation slip. It was found that the Peierls stresses and barrier height are dependent on core type. It was concluded that transformations of dislocation cores along minimal energy paths have to be taken into account for development of analytical models of the slip in magnesium. The results are compared with available first-principles calculations.


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Як цитувати

Ostapovets, A.; Vatazhuk, O. Peierls Barriers of a-Type Edge and Screw Dislocations Moving on Basal and Prismatic Planes in Magnesium. Fiz. Nizk. Temp. 2017, 43, 520-528.



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