Shock-induced α-ω transition in titanium

Equilibrium free energies for the alpha and omega phases of Ti are constructed. The result is a consistent picture of the ambient pressure, static high pressure, and shock data, as well as first-principles electronic structure calculations. The Hugoniot consists of three segments: a metastable alpha -phase region, a transition region, and an omega -phase branch. All the Hugoniot data are consistent with a transition occurring at similar to 12 GPa. An early identification [R. G. McQueen , in High Velocity Impact Phenomena, edited by R. Kinslow (Academic, New York, 1970)] of a phase transition at 17.5 GPa appears to have been an artifact. The shock Hugoniot extends further into the metastable region than static data, indicating the existence of a relaxation process occurring on a time scale intermediate between those of the static and dynamic measurements. (C) 2001 American Institute of Physics.