The microstructural characteristics of ultrafine-grained nickel

A. P. Zhilyaev, B. K. Kim, J. A. Szpunar, M. D. Baró, T. G. Langdon

Research output: Contribution to journalArticleResearchpeer-review

186 Citations (Scopus)

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 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. © 2004 Elsevier B.V. All rigths reserved.
Original languageEnglish
Pages (from-to)377-389
JournalMaterials Science and Engineering A
Volume391
Issue number1-2
DOIs
Publication statusPublished - 25 Jan 2005

Keywords

  • Differential scanning calorimetry (DSC)
  • Equal channel angular pressing (ECAP)
  • High-pressure torsion (HPT)
  • Nickel
  • Orientation imaging microscopy (OIM)

Fingerprint Dive into the research topics of 'The microstructural characteristics of ultrafine-grained nickel'. Together they form a unique fingerprint.

Cite this