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

研究成果: Article査読

7 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1569-1577
ページ数9
ジャーナルIsij International
58
9
DOI
出版ステータスPublished - 2018 9 15

ASJC Scopus subject areas

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

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