Multi-lattice kinetic Monte Carlo simulation of interphase kinetics for an iron fec to bcc transformation

Using an embedded atom method potential for iron, the kinetics of (lateral) growth in the massive austenite (gamma) to ferrite (alpha) transformation was analysed applying a newly developed multi-lattice kinetic Monte Carlo simulation approach. On this basis, for the first time the variable, individual activation energy for each single atomic jump could be accounted for. It was shown that the transformation is rate controlled by series of energetically unfavourable jumps by groups of atoms, necessary to create a path from gamma to alpha at the interphase.