Abstract
Abstract The driving force of premartensitic transformation (PT) based on the electron–transverse acoustic (TA) phonon interaction Hamiltonian was first calculated. The driving force of Ni 2 MnGa alloy is about 172.2 meV, larger than that of NiTi–Fe or Ni–Al alloy. The nucleation rate of PT has also been investigated in the interaction system. Considering the electron–phonon interaction and the condensation of TA phonon, double sine-Gordon equation of atomic phase angle has been proposed to study the nonlinear characteristics of PT and the electron–TA phonon coupling mechanism may be taken as its main mechanism.
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