Dislocation nucleation in shocked fcc solids: effects of temperature and preexisting voids

Details Dislocation nucleation in shocked fcc solids: effects of temperature and preexisting voids Dislocation nucleation in shocked fcc solids: effects of temperature and preexisting voids

2004-01-14

arxiv.org/abs/cond-mat/0401230v3

Phys. Rev. Lett. 93, 085501 (2004)

Physics

Condensed Matter

Materials Science

4 pages. (ver.2) All figures have been revised. Two citations are newly added. Numerical unit is unified in the context of sol

Scientific paper

10.1103/PhysRevLett.93.085501

Quantitative behaviors of shock-induced dislocation nucleation are investigated by means of molecular dynamics simulations on fcc Lennard-Jones solids: a model Argon. In perfect crystals, it is found that Hugoniot elastic limit (HEL) is a linearly decreasing function of temperature: from near-zero to melting temperatures. In a defective crystal with a void, dislocations are found to nucleate on the void surface. Also HEL drastically decreases to 15 percent of the perfect crystal when a void radius is 3.4 nanometer. The decrease of HEL becomes larger as the void radius increases, but HEL becomes insensitive to temperature.

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