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).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.msea.2004.09.030
ISSNs: 0921-5093 (print)
Keywords: nickel, equal channel angular pressing (ecap), high-pressure torsion (hpt), differential scanning calorimetry (dsc), orientation imaging microscopy (oim)
ePrint ID: 23846
Date :
Date Event
Date Deposited: 22 Mar 2006
Last Modified: 16 Apr 2017 22:43
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