Hydrogen-induced hardening and softening of a β-titanium alloy

The deformation behavior and microstructure of Ti40 alloy after hydrogenation were investigated. The results show that hydrogen could induce the precipitation of a new phase in Ti40 alloy. The structure type and chemical compositions of the new phase were face-centered cubic and Ti:V:Cr:Si = 30.6:19.2:49.2:1.0. The flow stress initially increased and then decreased with the increase in hydrogen content because of solution strengthening by hydrogen and the precipitation of the new phase.