Fatigue crack growth behaviour in single-colony lamellar structure of Ti–6Al–4V

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  • Kumamoto University
  • Kumamoto University


Microstructural fatigue crack growth in Ti–6Al–4V lamellar colonies was examined using small compact-tension specimens, with post-fatigue-test transmission electron microscopy for a mechanistic understanding of the anisotropy. In colonies oriented favourably for prismatic slip in the α phase, the crack grew by alternating shearing on two symmetrically arranged prismatic slip planes (unzipping process). Interlamellar decohesion along the α/β interface significantly increased the crack growth rate, which depended on the lamellar orientation. When the colony was loaded along [0001], deflected crack growth was accompanied by basal slip and < c + a > pyramidal slip gliding, and the crack growth rates slightly exceeded those during unzipping.


Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalScripta Materialia
Early online date23 Feb 2019
Publication statusPublished - 1 May 2019


  • Deformation structure, Fatigue, Micro-mechanical test, Slip, Titanium alloys