ABSTRACT
Assessment of the energy of the saddle states for transformations that can be performed by deformation (see Table 14.1) shows that the activation energy of lattice rearrangement is relatively small (about hundreds of calories per mole). At the same time, the activation energy of the ‘normal’ polymorphic transformation (e.g. in Fe-Cr alloys), estimated from experimental data, is close to the self-diffusion activation energy for the same substances, i.e. of the order of tens of kilocalories per mole. This significant difference (two orders of magnitude) between the experimentally measured and calculated values of activation energy can not be connected to any experimental nor calculation error calculation, and it seems very strange. It would seem that the experimentally measured activation energy should also be small.
