Deformation microstructures of Ti-52 at.% Al-3 at.% V alloy

Abstract

Deformation microstructures of the γ-TiAl phase in a polycrystalline Ti-52A1-3V (all compositions are given in atomic per cent) alloy have been studied by transmission electron microscopy. Heat-treated samples of this alloy were subjected to 3% plastic strain in compression at both room temperature and 600°C. The room-temperature deformation microstructure is characterized mainly by the presence of b = 〈 101]-type superdislocations together with a large number of faulted dipoles and some b= 〈 110]-type dislocations. In contrast, the elevated temperature (600°C) deformation microstructure is dominated by b= 〈 110]-type screw dislocations lying on {111} planes. An addition of 3 at.% V does not significantly change the deformation microstructure of the γ-TiAl phase.