Self- organizing processes and interphase interaction in solid-state structures

Abstract

Regularities of self-organizing processes and a role of interphase interactions in them were studied using as examples the heterogeneous solid-state structures with different mechanisms of energy dissipation and structural ordering (condensed metals on silicone, uniaxially deformed crystals, radiation-exposed structures. It is established that the interphase interaction in systems “metal condensate (Cu, Al, Cr, Au) – solid-state substrate (Si)” feature with domination of processes of self-organization on the part of the silicon substrate. Degree of self-organizing role of the substrate during formation of nanocondensates is defined by the value of a difference of electronegativities of the substrate and condensate materials. Viewed in this way, the uniaxially deformed crystal is a complex structure including following interphase-interacting elements: 1) "debris" – a layer formed on the previous pseudo-elastic stage of deformation; 2) locally fragmented cells in the crystal volume. The deformation induced interphase interaction between deformation fragments is a source of self-organizing processes in uniaxially deformed crystal. Degree of self-organizing processes is defined by differences in Young moduli of adjacent deformation fragments. In the structures there is an interphase boundary, which has relatively large values of the energy interphase interaction parameters, whose magnitude changes under the influence of X-ray irradiation. Under absorbed doses of the X-ray irradiation (8·10 1–10 2 Gy), energies of interphase interaction and interphase tension take on minimal values. This gives evidence on self-organization of the interphase boundary by a transition in the thermodynamic equilibrium state with its structural ordering accompanied with relaxation of mechanical stresses in this interface.