Fracture toughness of the Fe-Zn intermetallic compounds measured by bend testing of chevron-notched single-crystal microbeams

Norihiko L. Okamoto, Shota Michishita, Yukichika Hashizume, Haruyuki Inui

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The fracture toughness values of the five intermetallic compounds in the Fe-Zn system have been investigated through bend testing of chevron-notched single-crystal microbeams. The intermetallic compounds of the Fe-lean phases,1p and , exhibit fracture toughness values higher than the other compounds of the Fe-rich phases, ,1, and1k. The1p-phase compound exhibits a strong anisotropy in fracture toughness while the other four compounds exhibit almost no anisotropy. The compositional dependence of fracture toughness is discussed in terms of the surface energies estimated by ab initio calculations as well as the capability of stress relaxation around a crack by dislocation emission. The phase with a relatively wide solid solubility range exhibits no compositional dependence of the fracture toughness. The fracture toughness value of -phase microbeams that include a grain boundary at the chevron-notch position is comparable to that of the -phase single-crystal microbeams, indicating that the grain boundaries in the phase may not be particularly weak.

Original languageEnglish
Pages (from-to)1569-1577
Number of pages9
JournalIsij International
Volume58
Issue number9
DOIs
Publication statusPublished - 2018 Sep 15

Keywords

  • Ab initio calculations
  • Crystal anisotropy
  • Electron back scatter diffraction
  • Focused ion beam
  • Galvannealed steel
  • Grain boundary
  • Surface energy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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