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

3 Citations (Scopus)

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

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

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