Dislocation densities in soft and hard oriented grains of compression deformed textured NiAl polycrystals

T. Ungár, Krisztián Nyilas, Werner Skrotzki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

NiAl polycrystals with different textures have been compressed at room temperature with and without confining pressure to strains of 6 and 30%, respectively. Grain orientation dependent dislocation densities have been determined by X-ray line profile analysis using the multiple whole profile procedure. The dislocation density as well as the stored energy in hard grains, oriented with respect to the compression axis, generally is about half of that in soft grains, which are randomly oriented. Taking into account appropriate individual dislocation contrast factors it has been found that in hard grains slip mainly takes place by screw dislocations while in soft grains there is about a 50% contribution of mixed type dislocations. The results are discussed with respect to the inhomogeneity of deformation of plastically anisotropic materials and its effect on recrystallization.

Original languageEnglish
Pages (from-to)725-733
Number of pages9
JournalInternational Journal of Materials Research
Volume99
Issue number7
DOIs
Publication statusPublished - Jul 2008

Fingerprint

Polycrystals
polycrystals
Compaction
Screw dislocations
screw dislocations
profiles
Textures
confining
inhomogeneity
slip
X rays
textures
room temperature
x rays
Temperature
energy

Keywords

  • Compression
  • Dislocation density
  • Line broadening
  • NiAl
  • Stored energy

ASJC Scopus subject areas

  • Metals and Alloys
  • Materials Chemistry
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Dislocation densities in soft and hard oriented grains of compression deformed textured NiAl polycrystals. / Ungár, T.; Nyilas, Krisztián; Skrotzki, Werner.

In: International Journal of Materials Research, Vol. 99, No. 7, 07.2008, p. 725-733.

Research output: Contribution to journalArticle

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