Effects of strain rates on deformation twinning behavior in α-titanium

The deformation twins of commercial pure titanium were investigated under the split Hopkinson pressure bar compression with different strain rates. It was demonstrated that the types of twins induced by high-speed compression included 112¯2, 112¯4 contraction twins and 101¯2, 112¯1 extension twins. Furthermore, the quantities of the deformation twins at the high strain rates were more pronounced than those at the low to medium speed deformation. The content of 112¯2 twin increased with the strain rate, while 112¯1 twin's quantity decreased slightly with the increasing strain rate. The semi-quantitative relationship between twin density and strain rates was derived and discussed, which indicated that twin density was nonlinearly proportional to the strain rate.