Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio

Jianke Qiu, Xin Feng, Yingjie Ma, Jiafeng Lei, Aijun Huang, David Rugg, Rui Yang

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15 Citations (Scopus)


The influence of microstructures (β grain size, α/β colony size and width of α lath) and stress ratios (R = 0.1, 0.7) on fatigue crack growth (FCG) behavior of beta-annealed Ti624x (x = 2, 4 and 6) alloys was investigated. The FCG rate curves, crack paths, and the plastic zone ahead of the crack tip were compared. The reducing FCG resistance from Ti6242 to Ti6246 was found to stem from decreasing α/β colony size. Increasing stress ratio also reduced crack deflection and crack closure, and thus decreased the FCG resistance. The relevant mechanisms were discussed in terms of Kmax and crack closure effect.

Original languageEnglish
Pages (from-to)150-160
Number of pages11
JournalInternational Journal of Fatigue
Publication statusPublished - 1 Feb 2016
Externally publishedYes


  • Crack closure
  • Fatigue crack growth
  • Microstructure
  • Stress ratio
  • Ti624x

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