ATOMISTIC SIMULATIONS OF DISLOCATION NUCLEATION IN ALUMINUM
AY Kuksin and AV Yanilkin, SHOCK COMPRESSION OF CONDENSED MATTER - 2009, PTS 1 AND 2, 1195, 841-844 (2009).
Homogeneous dislocation nucleation is considered by means of molecular dynamics (MD) simulations. Dislocation nucleation starts from the formation of partial dislocation loop by thermal fluctuations. Stochastic properties of nucleation time are considered. Homogeneous nucleation rates are calculated at different temperatures and shear stresses. The comparison with dislocation theory is presented: the dependence of the loop energy on shear stress and radius, nucleation rate at different temperatures. The activation shear stresses of these mechanism are obtained.
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