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-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:726

Article

Yakushina, E.¹  Reshetov, A.¹  Semenova, I²  Polyakova, V²  Rosochowski, A.³  Valiev, R.² 

[1] Univ Strathclyde, Adv Forming Res Ctr, Dept Design Mfg & Engn Management, Glasgow, Lanark, Scotland

[2] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa, Russia

[3] Univ Strathclyde, Dept Design Mfg & Engn Management, Glasgow, Lanark, Scotland

关键词: Microstructure;    Titanium alloy;    Diffusion bonding;    Creep;    Recrystallisation;   

DOI  :  10.1016/j.msea.2018.04.052

来源: Elsevier

【 摘 要 】

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 degrees C and 825 degrees C during 2 and 4 h in a vacuum furnace. Coarsening of grain structure resulting from different DB cycles was quantified. The chain pores were observed at 725 degrees C for both microstructure conditions bonded during 2 h. The increase of bonding time up to 4 h leads to subsequent elimination of the pores. The UFG samples bonded at 725 degrees 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 h of DB bonding at 825 degrees 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 degrees C during 4 h.

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