Abstract
In the localized nucleation theory of martensite, the elastic constants of the beta phase are an important factor to explain the (in)stability of the premartensitic bcc-crystal and the nucleation of the martensite transformation. In the present paper the influence of an external applied stress on the elastic shear constants in the different {110} planes of the beta phase are calculated, using some new experimental data concerning the temperature dependence of the second and third order elastic constants. The mechanical stability of the strained regions present around some lattice defects is studied, taking into account the stress- or temperature induced modifications of the elastic constants. This leads to the formulation of a criterion relating the elastic properties and the lattice stability of the beta phase with the stress and temperature conditions to form stress- as well as thermal induced martensite.
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