Monte Carlo Simulations of Ordering in Ni-Mo–Based Alloys

Monte Carlo simulation of the ordering processes in Ni-Mo–based alloys has been carried out with two distinct sets of pair interaction energies (v 1 to v 10). In the first case, where the D022 and the N3M structures have nearly equal stability, a state of short-range order showing intensity maxima at {1½0} and equivalent positions results. This is similar to what is observed in binary Ni4Mo alloy. When some of the pair interaction energies are changed to make D022 more stable than N3M, {100}, {110}, and equivalent maxima also appear. This is what is observed when small ternary additions of Al or Mn are made to Ni-Mo.