Effect of hydrogenation on room temperature compression properties of TB8 titanium alloy

Hydrogen is usually used as a temporary component to adjust the mechanical and processing properties of titanium alloys through modifying the microstructure.The effect of hydrogenation on the room temperature compression properties was studied with compression test,and the microstructure evolution and phase transformation of TB8 titanium alloy after hydrogenation were investigated using OM,XRD and DTA.The results revealed that hydrogen reduced β transus temperature,the structure was completely transformed into β phase when hydrogen content reached 0.7wt%,and δ hydride and ω phase appeared in specimens after hydrogenation.Hydrogen had a relatively small impact on plasticity of TB8 alloy.However,due to the softening effect of the β phase,the yield strength after hydrogenation was lower than the original alloy.Strain hardening capacity gradually increased with the increasing of hydrogen content,mainly because the hydrogen atoms and hydrides hindered dislocation motion.