The influence of the microstructure morphology of two phase Ti-6Al-4V alloy on the mechanical properties of diffusion bonded joints

E. Yakushina, A. Reshetov, I. Semenova, V. Polyakova, A. Rosochowski, R. Valiev

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The influence of ultra fine grained (UFG) and coarse grained (CG) microstructure of the titanium alloy Ti-6Al-4V on the strength of a diffusion bonded (DB) joint was studied using a laboratory DB fixture and a new shear test rig. The DB process was carried out at 725°C and 825°C during 2 and 4 hours in a vacuum furnace. Coarsening of grain structure resulting from different DB cycles was quantified. The chain pores were observed at 725°C for both microstructure conditions bonded during 2 hours. The increase of bonding time up to 4 hours leads to subsequent elimination of the pores. The UFG samples bonded at 725°C showed a higher level of the shear strength than CG samples for both bonding times. The CG material demonstrated the highest shear strength after 4 hours of DB bonding at 825°C. The increase of the creep deformation of UFG samples when compared to the CG condition was observed as a result of DB at of 725° C during 4 hours.
Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalMaterials Science and Engineering: A
Early online date17 Apr 2018
Publication statusPublished - 30 May 2018


  • microstructure
  • titanium alloy
  • diffusion bonding
  • creep
  • recrystallisation

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