Fracture characteristics of bimodal microstructure in Ti-4.5Al-3V-2Mo-2Fe

Gunawarman, Mitsuo Niinomi, Kei Ichi Fukunaga, Daniel Eylon, Shiro Fujishiro, Chiaki Ouchi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Fracture characteristics of the bimodal microstructure in β-rich α+β alloy, Ti-4.5Al-3V-2Mo-2Fe, were studied. The bimodal microstructure was varied by changing annealing temperatures and cooling rates from the annealing temperatures. Annealing temperatures were varied between 1103 K and 1173 K in α+β field for 3.6 ks. While cooling rates were varied from rapid to slow cooling; namely water quenching, air-cooling, furnace cooling and slow furnace cooling. Results of study reveal that the fracture toughness (JIC) of the alloy increases with increasing annealing temperature for the given cooling rates except for air-cooling treatment. Relatively high fracture toughness is given by furnace cooling treatment with a cooling rate around 0.1 Ks-1. However, the fracture toughness decreases significantly in slow furnace cooling specimens with a cooling rate around 0.05 Ks-1. The microstructural factors dominating fracture toughness will be discussed.

Original languageEnglish
Pages (from-to)775-780
Number of pages6
JournalInternational Journal of Materials and Product Technology
Issue numberSPEC ISS. VOL.2
Publication statusPublished - 2001
Externally publishedYes


  • Bimodal microstructure
  • Cooling rate
  • Fracture characteristics
  • Fracture toughness
  • Ti-4.5Al-3V-2Mo-2Fe

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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