Deformation macrolocalisation and fracture in ultrafine-grained armco iron

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18 Citations (Scopus)

Abstract

The banded structure formed in armco iron specimens as a result of equal-channel angular extrusion causes their strong shear localisation under quasi-static tension. Applying transmission electron microscopy technique, a fine structure of meso- and macroscopic shear bands was revealed. The character of shear band propagation was studied by calculation of the maximum in-plane shear strain through a digital image correlation procedure. It was shown two different patterns of macroband propagation: two parallel shear bands with oppositely directed shears or a cross of shear bands oriented along the conjugate direction of maximum tangential stresses. The necking was revealed to be caused by the disturbance of self-consistent propagation of deformation macrobands.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalMaterials Science and Engineering A
Volume486
Issue number1-2
DOIs
Publication statusPublished - 15 Jul 2008

Keywords

  • Armco iron
  • ECAE
  • Mechanical properties
  • Shear bands
  • Surface displacement analysis

ASJC Scopus subject areas

  • Materials Science(all)

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