Investigation of Liquid-Solid Phase Transition Using Isentropic Compression Experiments (ICE)

Jean-Paul Davis
2002 AIP Conference Proceedings  
Isentropic ramp-wave loading of materials is a novel method to study the kinetics of phase transitions, particularly in regimes that cannot be accessed by shock-loading techniques. The Sandia Saturn accelerator produces magnetically driven planar ramp waves of 200-300 ns rise time in an aluminum drive plate, which then propagate into a material sample. In this way, molten tin initially at 600-700 K was isentropically loaded to 160-220 kbar, driving it across the liquid-solid phase boundary.
more » ... phase boundary. VISAR measurements at a sapphire window interface show possible evidence of nonequilibrium freezing in tin with a characteristic transition time around 100 ns. Improved experimental techniques are needed to verify this conclusion.
doi:10.1063/1.1483520 fatcat:mp5msos4drccphdcl7x5s3qp5y