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

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Yakushina, E. and Reshetov, A. and Semenova, I. and Polyakova, V. and Rosochowski, A. and Valiev, R. (2018) The influence of the microstructure morphology of two phase Ti-6Al-4V alloy on the mechanical properties of diffusion bonded joints. Materials Science and Engineering: A, 726. pp. 251-258. ISSN 0921-5093 (https://doi.org/10.1016/j.msea.2018.04.052)

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Abstract

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.

ORCID iDs

Yakushina, E. ORCID logoORCID: https://orcid.org/0000-0001-6498-4502, Reshetov, A. ORCID logoORCID: https://orcid.org/0000-0002-7865-9687, Semenova, I., Polyakova, V., Rosochowski, A. ORCID logoORCID: https://orcid.org/0000-0001-7896-8167 and Valiev, R.;
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