Journal of Materials Science

, Volume 43, Issue 11, pp 3792–3799 | Cite as

Effects of grain boundary- and triple junction-character on intergranular fatigue crack nucleation in polycrystalline aluminum

  • Shigeaki KobayashiEmail author
  • Toshiyuki Inomata
  • Hiroyuki Kobayashi
  • Sadahiro Tsurekawa
  • Tadao Watanabe
Intergranular and Interphase Boundaries in Materials


The effects of grain boundary- and triple junction-character on intergranular fatigue crack nucleation were studied in coarse-grained polycrystalline aluminum specimens whose grain boundary microstructures were analyzed by SEM-EBSD/OIM technique. Fatigue crack nucleation occurred mainly along grain boundaries and depended strongly on both the grain boundary character and grain boundary configuration with respect to the persistent slip bands. However, it was little dependent on the geometrical arrangements between the grain boundary plane and the stress axis. Particularly, random boundaries become preferential sites for fatigue crack nucleation. The fatigue cracks were also observed at CSL boundaries when the grain-boundary trace on the specimen surface was parallel to persistent slip bands. On the other hand, no intergranular fatigue cracks were observed at low-angle boundaries. The fatigue cracks were observed at triple junctions as well as grain boundaries. Their nucleation considerably occurred at triple junctions where random boundaries were interconnected. The grain boundary engineering for improvement in fatigue property was discussed on the basis of the results of the structure-dependent intergranular and triple junction fatigue crack nucleation.


Fatigue Crack Triple Junction Boundary Character Polycrystalline Aluminum Random Boundary 



The authors would like to express their gratitude to Prof. S. Saito of Ashikaga Institute of Technology, for his help in cold rolling of the pure aluminum sheets. One (S.K) of the authors is grateful to Ashikaga Institute of Technology for a special support for participating in iib ‘07, where this paper was presented.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Shigeaki Kobayashi
    • 1
    Email author
  • Toshiyuki Inomata
    • 1
  • Hiroyuki Kobayashi
    • 1
  • Sadahiro Tsurekawa
    • 2
    • 3
  • Tadao Watanabe
    • 2
    • 4
  1. 1.Department of Mechanical Engineering, Faculty of EngineeringAshikaga Institute of TechnologyAshikagaJapan
  2. 2.Department of Nanomechanics, Graduate School of EngineeringTohoku UniversitySendaiJapan
  3. 3.Faculty of EngineeringKumamoto UniversityKumamotoJapan
  4. 4.Visiting Professor, Key Laboratory of Electromagnetic Processing of Materials (EPM)Northeastern UniversityShenyangP.R. China

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