Grain boundary sliding and rotational mechanisms of intragranular deformation at different creep stages of high-purity aluminum polycrystals at various temperatures and stresses

V. E. Panin, N. S. Surikova, T. F. Elsukova, I. V. Vlasov, D. V. Borisyuk

Research output: Contribution to journalArticle

Abstract

In the paper we show that grain boundary sliding dominates in the creep of A999 aluminum polycrystals and is accommodated by rotation modes of intragranular deformation. Accommodation mechanisms strongly depend on the applied stress σ and creep temperature T. At low σ and T, accommodation occurs by dislocation glide and mesoscale fragmentation. At high σ and T, there appears lattice curvature, which causes the development of shear bands, multiscale fragmentation, and formation of a quasi-neck with nanosized subgrains and plastic microrotations. Noncrystallographic shears in their subboundaries propagate in local lattice curvature zones under τmax by the plastic distortion mechanism.

Original languageEnglish
Pages (from-to)276-284
Number of pages9
JournalMaterials Science and Engineering A
Volume733
DOIs
Publication statusPublished - 22 Aug 2018

Fingerprint

Grain boundary sliding
Polycrystals
accommodation
polycrystals
Aluminum
sliding
Creep
fragmentation
purity
plastics
grain boundaries
curvature
Plastics
shear
aluminum
Shear bands
Temperature
temperature
causes

Keywords

  • Creep
  • Fracture
  • Grain boundary sliding
  • Grains and interfaces
  • High-purity aluminum polycrystals
  • Plasticity methods

ASJC Scopus subject areas

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

Cite this

Grain boundary sliding and rotational mechanisms of intragranular deformation at different creep stages of high-purity aluminum polycrystals at various temperatures and stresses. / Panin, V. E.; Surikova, N. S.; Elsukova, T. F.; Vlasov, I. V.; Borisyuk, D. V.

In: Materials Science and Engineering A, Vol. 733, 22.08.2018, p. 276-284.

Research output: Contribution to journalArticle

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AU - Panin, V. E.

AU - Surikova, N. S.

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AU - Vlasov, I. V.

AU - Borisyuk, D. V.

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