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The microstructural characteristics of ultrafine-grained nickel

Zhilyaev, A.P., Kim, B.-K., Szpunar, J.A., Baró, M.D. and Langdon, T.G. (2005) The microstructural characteristics of ultrafine-grained nickel Materials Science and Engineering: A, 391, (1-2), pp. 377-389. (doi:10.1016/j.msea.2004.09.030).

Record type: Article


A detailed investigation was conducted to evaluate the microstructural characteristics in samples of pure nickel processed using three different procedures of severe plastic deformation (SPD): equal-channel angular pressing (ECAP), high-pressure torsion (HPT) and a combination of ECAP and HPT. Several different experimental techniques were employed to measure the grain size distributions, the textures, the distributions of the misorientation angles and the boundary surface energies in the as-processed materials. It is shown that a combination of ECAP and HPT leads both to a greater refinement in the microstructure and to a smaller fraction of boundaries having low angles of misorientation. The estimated boundary surface energies were higher than anticipated from data for coarse-grained materials and the difference is attributed to the non-equilibrium character of many of the interfaces after SPD processing.

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Published date: 2005
Keywords: nickel, equal channel angular pressing (ecap), high-pressure torsion (hpt), differential scanning calorimetry (dsc), orientation imaging microscopy (oim)
Organisations: Engineering Sciences


Local EPrints ID: 23846
ISSN: 0921-5093
PURE UUID: 5727bbe7-dfc6-4432-bfe6-54c525064473
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 22 Mar 2006
Last modified: 17 Jul 2017 16:16

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Author: A.P. Zhilyaev
Author: B.-K. Kim
Author: J.A. Szpunar
Author: M.D. Baró
Author: T.G. Langdon ORCID iD

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