J. Phys. IV France 07 (1997) C5-29-C5-34
Lattice Dynamics of Martensitic Transformations Examined by Atomistic SimulationsR. Meyer and P. Entel
Theoretische Tieftemperaturphysik, Gerhard-Mercator-Universität, Gesamthochschule Duisburg Lotharstrasse 1, 47048 Duisburg, Germany
We have performed molecular dynamics simulations of Fe80Ni20 alloys using an inter-atomic potential of the EAM-type which allows the simulation of the martensite-austenite transition. We present results, showing the development of an inhomogeneous shear system on a nanoscale during the thermally induced austenitic transformation. In addition to this we obtained the phonon dispersion relations of the martensite phase by calculating the dynamical structure factor from our simulation results. On approaching the transition temperature the phonon dispersion shows anomalies which might be connected with the formation of the microstructure during the austenitic transition.
© EDP Sciences 1997