Isentropic compression of iron with the Z Accelerator

Asay, J. R.; Hall, C. A.; Holland, K. G.; Bernard, M. A.; Stygar, W. A.; Spielman, R. B.; Rosenthal, S. E.; McDaniel, D. H.; Hayes, D. B.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1151
Academic Journal
Development of isentropic loading techniques is a long standing goal of the shock physics community. We have used the Sandia Z Accelerator to produce smoothly increasing pressure loading on planar iron specimens over time durations of 100 ns and for pressures to 300 kbar. Free surface velocity measurements were made on specimens 0.5-mm and 0.8-mm thick that clearly show wave evolution into the well known two-wave structure resulting from the α-ε phase transition. The resulting wave profiles are analyzed with a rate-dependent phase transition model to extract information on phase transformation kinetics for isentropic compression of iron. Comparison of the experiments and calculations demonstrate the value of isentropic loading for studying phase transition kinetics.


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