Deformation energy of NiTi shape memory wires

► Deformation energy of B2 and R phase NiTi wires was studied by the MTT method. ► Superelastic energy for B2 wire was higher than the shape memory energy for R wire. ► The secondary elastic energy of was marginally higher for the B2-phase wires. ► Strain rate had little effect on the deformation energies of the B2-phase wires. ► The energy components of the R-phase wires were improved by increasing strain rate.