Papers by Keyword: Monocrystals

Abstract: The microstructure of aluminum nanopowder combustion crystalline products in air and the influence of a constant magnetic field (with induction of 0.3 T) on their structures have been studied. It was revealed that in the combustion products of free-poured aluminum nanopowder two-level whiskers are present. Hexagonal single crystals are formed by combustion in air in a homogeneous magnetic field, and in case of inhomogeneous magnetic field (with induction of 0.3 T) faceted elongated crystals of micron size are generated. The crystallites of such structure are formed due to the mass transfer of the combustion products in the direction of thermal flows. Ordered six-sided crystal structures are formed by overcooling the oxidation products by the action of magnetic field and by increasing the mobility of their structural units in recrystallization thermal wave. According to electron- microscope investigation the formation of the faceted crystals is possible with optimal sizes of combustion product particles.

Abstract: The evolution of local strain during stretching of high-manganese carbon austenite (Hadfield steel) was studied. The ordered patterns of strain localization proved to be closely related to the stages in the stress–strain curve. The results of this study are compared with analogous data for chromium–nickel nitrogen austenite single crystals. The velocity of self-consistent motion of the sites where plastic strain during stretching of gamma-Fe single crystals is nonuniform was determined as a function of the strain hardening coefficient and deformation mechanism.