Abstract
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 grain boundary character distributions (GBCD) 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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Zhilyaev, A. (2006). Microstructural Characteristics of Ultrafine-Grained Nickel. In: Zhu, Y.T., Varyukhin, V. (eds) Nanostructured Materials by High-Pressure Severe Plastic Deformation. NATO Science Series, vol 212. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3923-9_11
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DOI: https://doi.org/10.1007/1-4020-3923-9_11
Publisher Name: Springer, Dordrecht
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