COMPUTER-SIMULATION OF BCC FCC INTERPHASE BOUNDARIES

The structure of (100)b/(100)f and (011)b/(111)f boundaries between face centred cubic austenite and body centred cubic martensite have been investigated using computer simulation techniques. Forces among the atoms were established separately by Johnson J0 and Finnis-Sinclair many-body potentials for iron. The dislocation networks were studied in the relaxed crystal models. Special consideration is given to the misfit dislocations at the interface which can accomplish the lattice-invariant shear of phenomenological theories of martensite crystallography. The results obtained are consistent with the available experimental evidences. The energies of (100)b/(100)f and (011)b/(111)f interfaces are found to be 778 and 448 mJ/m2, respectively.