Ab initiostudy of interacting lattice vibrations and stabilization of theβphase in Ni-Ti shape-memory alloy

Abstract

Lattice dynamical methods used to predict phase transformations in crystals typically evaluate the harmonic phonon spectra and therefore do not work in frequent and important situations where the crystal structure is unstable in the harmonic approximation, such as the $\ensuremath{\beta}$ structure when it appears as a high-temperature phase of the shape memory alloy Ni-Ti. Here it is shown by self-consistent ab initio lattice dynamical calculations that the critical temperature for the premartensitic $R$-to-$\ensuremath{\beta}$ phase transformation in Ni-Ti can be effectively calculated with good accuracy, and that the $\ensuremath{\beta}$ phase is a result primarily of the stabilizing interaction between different lattice vibrations.