Liquid-vapor phase boundaries determination by dynamic experimental method

Shock-induced vaporization of matter under expansion from high-energy states is of interest as an experimental method to determine two-phase region boundaries and position of critical point of liquid- vapor transition. Fast pyrometry technique was used to determine velocity of expansion, pressure and temperature nearby metal - gas boundary. Heating of material under research on the boundary with hot shocked gas at a constant final pressure of material expansion is another source of high temperature states. Optically transparent or translucent shocked helium and neon give the possibility to achieve temperatures and pressures exceeding critical parameters of tungsten- one of the most refractory metals. Intensive heat and mass transfer on the boundary give the opportunity to investigate states not only near binodal but also liquid spinodal. Experimental results and issues of such investigation with lead, tin, nickel, and tungsten is analyzed in the proposed paper.