Abstract
A Monte Carlo simulation model which uses thermochemical experimental data to predict short-range atomic order in face-centered-cubic (f.c.c.), solid solution alloys of Fe containing both substitutional and interstitial solute elements is described by reference to the ordering of an FeNiCrN alloy. The interaction energies between pairs of atoms and between N and an interstitial vacancy are evaluated by matching the molar Gibbs free energy, predicted by a quasichemical model, to that deduced from thermochemical data. These are then used in a Monte Carlo simulation to determine the equilibrium short-range order, defined by the distribution of Ni, Cr and N atoms among the octahedral cells of the metal lattice. Applying the model to two Fe40Ni15Cr alloys—one with zero and the other with 0.25 wt.% N—at 1273 and 298 K revealed that, at the higher temperature, the distribution of the Ni and Cr atoms in the N-free alloy is nearly random but, in the alloy containing 0.25 wt.% N, there is appreciable short-range order involving both the metal and N atoms. Decreasing the temperature to 298 K increases the order in both alloys. The implication of the short-range order and N apportionment for the deformation mechanism in FeNiCrN f.c.c. alloys is discussed.
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