The paper presents the results of the transmission electron microscopic (TEM)
investigation of the structure and phase composition of nanocrystalline copper obtained by the
severe plastic deformation using the high pressure torsion (HPT) method. Special attention is paid
to the triple junctions of grain boundaries. It was established that the triple junctions contained the
partial disclinations and particles of the secondary phases. The dependences of such junction
fractions on the deformation were measured of the formation at nanocrystalline copper. The phase
analyses of the secondary phase structure were carried out, the sizes of the phase particles and their
volume fractions were determined. The bending – torsion of the crystal lattice arising near the triple
junctions was measured. The problem of the long – range stress field screening was considered.
The micromechanisms of plastic deformation of ultrafine grained metallic materials are analyzed using copper, the nanostructure of which is produced by equal channel angular pressing, as an example. Slip traces are studied at various deformation stages, and their parameters are estimated. The change in the gran ular structure during deformation has been studied.
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