Molecular dynamic simulation of a homogeneous bcc→hcp transition -: art. no. 224116

We have performed molecular dynamic simulations of a martensitic bcc-->hcp transformation in a homogeneous system. The system evolves into three martensitic variants, sharing a common nearest-neighbor vector along a bcc(111) direction, plus an fee region. Nucleation occurs locally, followed by subsequent growth. We monitor the time-dependent scattering S(Q,t) during the transformation, and find anomalous, Brillouin-zone-dependent scattering similar to that observed experimentally in a number of systems above the transformation temperature. This scattering is shown to be related to the elastic strain associated with the transformation and is not directly related to the phonon response.