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

Bohdan Koman, Volodimyr Yuzevich

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 (8·101–102 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.


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