Influences of grain size and grain boundary segregation on mechanical behavior of nanocrystalline Ni

X. F. Zhang, T. Fujita, D. Pan, J. S. Yu, T. Sakurai, M. W. Chen

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Nanocrystalline Ni with mean grain sizes ranging from ∼15 to 95 nm was fabricated by electroplating and post-annealing. The influence of annealing on deformation behavior was systematically investigated by inspecting strain rate sensitivity (m) and activation volume (V) using nanoindentation. In addition to the strong dependence of the m and V values on nanograin sizes, annealing induced grain boundary change, probably caused by GB relaxation and segregation, leads to the transition from a stress-activated dislocation emission mechanism in the as-fabricated sample to a thermal activation on dislocation emission.

Original languageEnglish
Pages (from-to)2297-2304
Number of pages8
JournalMaterials Science and Engineering A
Volume527
Issue number9
DOIs
Publication statusPublished - 2010 Apr 15

Keywords

  • Grain boundary microstructure
  • Grain size
  • Nanocrystalline Ni
  • Plastic deformation mechanisms

ASJC Scopus subject areas

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

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