Shock waves in materials with Dzugutov-potential interactions

Abstract

The influence of shock waves on the bcc ground state, the metastable $\ensuremath{\sigma}$ phase, and quasicrystal structures of the Dzugutov potential [Phys. Rev. A 46, R2984 (1992)] has been studied by molecular dynamics. In general, a phase transition is observed to the well-known high-pressure fcc- or hcp-phase. The details of the phase transition and the perfection of the created phases depend on the orientation of the shock wave propagation direction with respect to the symmetry axes. The results are in good qualitative agreement with recent simulations with embedded atom method potentials designed specifically for iron. For the quasicrystal we observed flips, a new plasticity mode predicted for these structures. Furthermore we will report the results for an amorphous structure supplied with the same potential. No crystallization takes place in this case, indicating that it is easier to shift atomic layers collectively than to order the atoms one by one.