Molecular-dynamics simulation of edge-dislocation dynamics in aluminum

A. Y. Kuksin, V. V. Stegailov, and A. V. Yanilkin, Doklady Physics, 53, 287-291 (2008).

We have constructed a molecular-dynamic model of motion of the edge dislocation in a single crystal. In the model of aluminum structure, we obtained the dependences of the velocity of the edge dissociated dislocation on the shear stress at various temperatures. With increasing applied shear stress, the ultimate velocity of dislocations close to the rate of propagation of elastic shear perturbations is achieved. The obtained temperature dependence of the phonon drag coefficient agrees at low temperatures with the available experimental data and with the existing theoretical notions. On approaching the melting temperature, the dependence of the drag coefficient of dislocations significantly deviates from linear. The results agree with the experimental data on the temperature dependence of the yield stress in aluminum under high rate deformation conditions and can be used for determining the dislocation density behind the shock-wave front.

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