Microstructure of severely deformed metals from X-ray line profile analysis

J. Gubicza, N. H. Nam, K. Máthis, V. V. Stolyarov

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Abstract

Two essentially different materials, cubic Ti49.8Ni 50.2 shape memory alloy and hexagonal AZ91 Mg alloy, were deformed by equal channel angular pressing (ECAP). The microstructure developed as a result of severe plastic deformation was studied by X-ray line profile analysis. The correlation between the microstructure and the mechanical behavior was also investigated. Below 100°C the tensile strength of the Mg alloy increased as a consequence of the increase of the dislocation density owing to ECAP. Above 200°C the strength decreased and the ductility increased as a result of the breakage of the Al12Mg17 precipitates due to ECAP. The analysis of the dislocation contrast factors of Ti49.8Ni 50.2 revealed that 〈100〉{110} dislocations with 〈111〉 line vector formed during ECAP.

Original languageEnglish
Pages (from-to)93-98
Number of pages6
JournalZeitschrift fur Kristallographie, Supplement
Volume1
Issue number23
Publication statusPublished - Dec 1 2006

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Keywords

  • Crystallite size
  • Dislocation structure
  • Line profile analysis
  • Severely deformed metals

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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