Monastyrskyi H. Structural phase transitions in inhomogeneous, non equilibrium and spatially restricted states of functional materials

Peculiarities of the structural phase transitions (PT), martensitic transformation (MT) in inhomogeneous, nonequilibrium states of special class of functional materials on the basis of metal alloys are systematically investigated. In dissertation, this class is represented by alloys based on Ti-Ni, Cu-Al-Ni, Ni-Al, Ni-Mn-Ga, Fe-Mn-Si, Hf-Pd, which undergo MT and demonstrate the shape memory effect (SME), superelasticity, high damping capacity, magnetically controlled and high-temperature effect of shape memory, as well as bulk amorphous alloy Zr-Cu-Al-Ni-Ti, titanium nitride with unique mechanical characteristics. The work is addressed on the materials whose functionality is determined by a special class of structural phase transitions - martensitic transformation, which are manufactured by induction and arc melting, spark errosion method and spark plasma sintering method. It is shown that the study of the formation of inhomogeneous states is a key issue in understanding and modeling their effect on MT in functional alloys suitable for the practic.