A CRYSTON MODEL FOR THE FORMATION OF TYPICAL COMPONENTS OF THE ROLLING TEXTURE IN A METAL WITH A CUBIC LATTICE

10.25712/ASTU.1811-1416.2022.02.003

Abstract

In the process of plastic deformation by rolling, polycrystalline samples with initially chaotic orientation of the crystal lattices of grains, as a rule, are textured, that is, several selected variants of lattice orientations in grains appear, in which well-defined planes make up the smallest angles with the rolling plane. When interpreting the observed typical textures for crystals with cubic lattices, it is shown that a visual description of the textures is achieved within the framework of the cryston approach. The essence of the cryston approach associated with the contact interaction of dislocations at the intersection of glide planes is briefly described in the section devoted to the main component of the texture in crystals with a face-centered cubic lattice. In the following, information is provided about typical textures in crystals with a volume-centered cubic lattice, and for each of the textures, the "composition" of crystons is presented, reflecting the partial contribution of dislocations belonging to interacting sliding systems. When discussing the results, it is shown that there are reasons to consider the formation of the observed textures as a consequence of the tendency of an open nonequilibrium system to relax to the equilibrium state in the shortest possible way in time. This conclusion is equivalent to Ziegler's principle of maximum entropy production for open systems far from the equilibrium position.