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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 354Nanostructuring of Ni by Various Modes of Severe...

Nanostructuring of Ni by Various Modes of Severe Plastic Deformation

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Abstract:

Various modes of severe plastic deformation (SPD), such as high-pressure torsion (HPT) at cryogenic temperature, equal channel angular pressing (ECAP) and dynamic channel-angular pressing (DCAP), have been applied for nanostructuring of Ni, and the thermal stability of the structure obtained has been studied. The nanocrystalline structure with average grain sizes of 80 nm and the microhardness of 6200 MPa is produced by HPT in liquid nitrogen. DCAP and ECAP result in the submicrocrystalline structure of a mixed type, with ultra-fine grains separated by high-angle boundaries along with deformation bands and coarse cells with low-angle dislocation boundaries. The thermal stability of the structures obtained by ECAP and DCAP is approximately the same, and it is higher than after the HPT at cryogenic temperature.

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Periodical:

Defect and Diffusion Forum (Volume 354)

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109-119

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.354.109

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Online since:

June 2014

Authors:

Vladimir V. Popov*, E.N. Popova, D.D. Kuznetsov, Alexey V. Stolbovsky, Evgeniy V. Shorohov, Gerrit Reglitz, Sergiy V. Divinski, Gerhard Wilde

Keywords:

Grain Boundary, Microhardness, Nanocrystalline Materials, Polycrystals, Scanning Electron Microscopy (SEM), Severe Plastic Deformation, Thermal Stability, Transmission

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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