Microstructural characterization of friction welded TiAl-Ti6Al4V hybrid joints

Abstract

This paper describes microstructure and microtexture development in dissimilar friction welded γ-TAB-Ti64 joints. The effect of friction welding parameters on microstructure and local properties are examined and discussed. It was found that the intermetallic γ-TiAl based alloy Ti- 47Al-3.5(Mn+Cr+Nb)-0.8(B+Si) (denoted as γ-TAB) is more sensitive to the applied friction welding parameters used in this study. Furthermore, the bonding between these two alloys was controlled by a diffusion process during a very short process duration. Grain refinement as well microstructure transformation led to local improvement of the friction-welded joints. © (2010) Trans Tech Publications.