The effects of crystallographic orientation on fatigue crack initiation behavior in Ti-6Al-4V

Shun Sasaoka, Jinta Arakawa, Hiroyuki Akebono, Atsushi Sugeta, Yoshihisa Shirai, Eisuke Nakayama, Yukihiko Kimura

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The influence of microstructure on crack initiation behavior of Ti-6Al-4V was investigated by using atomic force microscope (AFM) and electron backscattered diffraction (EBSD). This research considers the effects of both the Schmid factor (SF) value and the slip direction of the grain on fatigue crack initiation sites. The result shows that fatigue cracks tend to form basal slips in primary α grains. In addition, these cracks are generated from primary α grains with relatively high basal SF values. However, it was found that fatigue cracks do not necessarily originate from basal planes of primary α grain with the maximum SF value. Finally, a new parameter that combines SF and the slip angle Ω (slip angle Ω is the angle between the specimen surface and the slip direction) was suggested and that parameter enables to predict fatigue crack initiation sites, since it was revealed that fatigue cracks initiated from primary α grains with high SFsinΩ values.

Original languageEnglish
Pages (from-to)371-383
Number of pages13
JournalInternational Journal of Fatigue
Publication statusPublished - Dec 2018
Externally publishedYes


  • EBSD analysis
  • Fatigue crack initiation
  • Schmid factor
  • Slip direction
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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