Microstructural characteristics of nickel processed to ultrahigh strains by high-pressure torsion

A. P. Zhilyaev, A. A. Gimazov, E. P. Soshnikova, Á Révész, T. G. Langdon

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The microstructures of highly strained high-pressure torsion (HPT) nickel processed from bulk master metals pre-strained to different levels of strain and from electrodeposited (ED), ball milled (BM) samples and rapidly quenched (RQ) ribbons were studied by transmission electron microscopy and X-ray diffraction. High-resolution X-rays showed that the BM + HPT specimens had the smallest coherent domain size of ∼9 nm and the RQ + HPT samples possessed a high dislocation density of ∼6.7 × 1015 m-2. Gradually increasing the strain in bulk nickel led to an increasing dislocation density and a decreasing coherent domain size. Microhardness measurements revealed differences in the mechanical behavior in HPT-strained nickel specimens. There is a good correlation between the microhardness measurements and the dislocation density measured with high-resolution X-rays.

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalMaterials Science and Engineering A
Volume489
Issue number1-2
DOIs
Publication statusPublished - Aug 20 2008

Keywords

  • High-pressure torsion
  • Microhardness
  • Microstructure
  • Nickel
  • Ultrahigh strains
  • X-ray techniques

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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