MARTENSITIC PHASE-TRANSITION WITH 2-COMPONENT ORDER-PARAMETER IN A STRESSED CUBIC-CRYSTAL

Martensitic phase transitions in a stressed cubic crystal are studied by means of Landau theory with a two-component order parameter. The st ress-temperature phase diagram is analyzed theoretically and is shown to consist of six essentially different regions isolated by the liabil ity lines of austenite, tetragonal martensitic and orthorhombic marten sitic phases. The triple point is also present in the phase diagram. T he role of the cubic term in the Landau-Ginzburg potential in the desc ription of the phase transition properties is emphasized.