Influence of Equal-Channel Angular Pressing on Grain Structure and Internal Stresses of Technically Pure Nickel; Russian Physics Journal; Vol. 65, iss. 9

Influence of Equal-Channel Angular Pressing on Grain Structure and Internal Stresses of Technically Pure Nickel; Russian Physics Journal; Vol. 65, iss. 9

Bibliographic Details
Parent link:	Russian Physics Journal Vol. 65, iss. 9.— 2023.— [P. 1436-1442]
Corporate Author:	Национальный исследовательский Томский политехнический университет Школа базовой инженерной подготовки Отделение естественных наук
Other Authors:	Popova N. A. Nataljya Anatoljevna, Nikonenko E. L. Elena Leonidovna, Solovjeva Yu. V. Yuliya Vladimirovna, Starenchenko V. A. Vladimir Aleksandrovich
Summary:	Title screen Using transmission electron microscopy, the structure, phase composition, defects, amplitude of internal stresses and their sources are studied in the ultrafine-grained technically pure nickel produced by the method of equal-channel angular pressing (ECAP). During ECAP, the samples are subjected to shear deformation by compression along two intersecting channels of equal diameters at an angle of 120° and a temperature of T = 400°C without intermediate annealing within four passes, n = 4. An examination of the grain structure demonstrates that all grains are anisotropic. According to the dislocation structure, the grains are classified into three types: 1) the smallest grains with no substructure (practically no dislocations) – dislocation-free grains, 2) larger grains containing chaotically distributed dislocations or a net substructure, and 3) the largest grains with a cellular or fragmented substructure. The average value of the scalar dislocation density in the grains of each type is calculated. It is found out that equal-channel angular pressing results in the formation of nanosized particles of secondary phases localized inside the grains, at grain boundaries and at grain junctions of ultrafine-grained nickel. The sources of internal stresses are revealed and their amplitude is determined. The amplitude of the internal stresses is calculated using the amplitude of the crystal lattice curvature-torsion from the bending extinction contours Режим доступа: по договору с организацией-держателем ресурса
Language:	English
Published:	2023
Subjects:	электронный ресурс труды учёных ТПУ severe plastic deformation equal-channel angular pressing ultrafine-grained nickel grain particle dislocation structure scalar dislocation density internal stresses amplitude of curvature-twist of crystal lattice stress sources
Online Access:	https://doi.org/10.1007/s11182-023-02788-5
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=669200

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