A hypothesis for two-stage character of deformation under load via the simple shear scheme is suggested. At the first stage in the shear strain range , where - the strain parameter, the metal microstructure changes in the way similar to that during elongation. At the second stage at accidental multi-scale rotative motions, similar to turbulent motions in liquids, take place in the metal. This stage of deformation is the proper simple shear. The results of experiments are presented, which testify in favor of the suggested hypothesis.
The method of rolling with shift in comb-shaped calibres for a bar is developed in order to create the conditions of severe deformation in the processed AD-1 aluminium alloy. The method provides formation of a structural state with the controlled fraction of nanostructure. As shown, the rolling with shift results in intensive fragmentation of the structure and reduction of the anisotropy of the material properties in different sections of the billet, as compared to the conventional rolling.Розвинуто методу вальцювання зі зсувом у калібрах з гребінчастою поверхнею для смуги, що уможливлює створити умови інтенсивної деформації в оброблюваному алюмінійовому стопі АД-1. Метода забезпечує формування структурного стану з реґульованою часткою наноструктури. Показано, що вальцювання зі зсувом спричиняє інтенсивну фраґментацію структури і зниження анізотропії властивостей матеріялу в різних перетинах заготівки в порівнянні з прокаткою за стандартною технологією.Развит метод прокатки со сдвигом в калибрах с гребенчатой поверхностью для полосы, что позволяет создать условия интенсивной деформации в обрабатываемом алюминиевом сплаве АД-1. Метод обеспечивает формирование структурного состояния с регулируемой долей наноструктуры. Показано, что прокатка со сдвигом приводит к интенсивной фрагментации структуры и снижению анизотропии свойств материала в разных сечениях заготовки в сравнении с прокаткой по стандартной технологии.
It has been revealed that in Iridium influenced be severe plastic deformation (SPD) a ultrafine grained (UFG) structure is formed (the grain size of 20-30 nm), but in the bodies of grains there are practically no defects of structure, however, after irradiation a subgrain structure, (subgrain size of 3-5 nm) is formed, and in the bodies of subgrains there are defects. The subgrain structure was also revealed in UFG Nickel and Copper after SPD (subgrain size of 3-15 nm), but in the latter case the observed boundary region is broader and subgrain are highly disoriented.
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