Abstract
We studied the pseudoelastic behavior of hypostoichiometric NiAl alloys using a very simple model, with interplanar interaction parameters extracted from recent neutron-scattering experiments. The behavior of the system under shear is studied numerically both in the static (quasiequilibrium) limit and with molecular dynamic simulations. Our results indicate that anomalous phonon softening can facilitate the nucleation of the martensitic phase near boundaries or defects as the system approaches the transformation temperature. For our simple model, we found that the criical stress for the nucleation of the martensitic phase is reduced by almost a factor of 2 as a result of anomalous phonon softening near the martensitic transformation temperature.
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