Yevich Y. Patterns of contact formation and evolution on the various stages of consolidation into disperse systems

Thesis for a scientific degree of candidate of science of physics and mathematic sciences 01.04.07 - solid state physics. Frantsevich Institute for problems of Material Science of NAS of Ukraine. The thesis is devoted to the analysis of physical regularities of contact formation into consolidated metallic disperse systems. Novel results concern physical phenomena that determines the effect of structural parameters on evolution of contact. The model of contact formation during sealing is proposed, the effect of porosity and particle's size on contact formation is analyzed. It is established that contact forms in two steps: firstly the planar pore silts, then bulk sintering occurs. Criteria of quality of perfect contact are formulated based on results of analysis of mechanical properties: based on crack resistance measurements for brittle and quasibrittle fracture and based on analysis of true deformation during pothol fracture. Optimal technological regimes of plastic sealing for disperse particles have been proposed based on obtained results.