Calorimetric and X-ray measurements in ultrafine-grained nickel

A. P. Zhilyaev, J. Gubicza, S. Suriñach, M. D. Baró, T. G. Langdon

Research output: Contribution to journalConference article

16 Citations (Scopus)

Abstract

The procedures of X-ray diffractometry and peak profile analysis, together with differential scanning calorimetry (DSC), were used to measure the grain size, dislocation density and corresponding elastic energy stored in ultrafine-grained (UFG) nickel processed by different methods: equal channel angular pressing, high pressure torsion and their combinations. It has been shown that grain growth in these samples begins at temperatures in the range from 500 to 700 K and the measured activation energy for grain growth is close to the activation energy for grain boundary self-diffusion. A difference between the released enthalpy in DSC experiments and the elastic energy evaluated by x-ray diffractometry is attributed to the decrease in surface energy during grain growth in UFG nickel. The grain boundary (GB) surface energy of high angle boundaries was also evaluated.

Original languageEnglish
Pages (from-to)4507-4512
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number5
DOIs
Publication statusPublished - Jan 1 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: Jul 7 2003Jul 11 2003

Keywords

  • Equal-channel angular pressing
  • Grain boundary misorientations
  • High-pressure torsion
  • Nickel
  • Ultrafine-grain sizes

ASJC Scopus subject areas

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

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