Isentropic Compression of Iron with the Z Accelerator
Development of isentropic loading techniques is a long standing goal of the shock physics community. The authors 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 Mbar. Free surface velocity measurements on the rear surface of the continuously loaded specimens were made on specimens 0.5-mm and 0.8-mm thick and clearly show the effects of wave evolution into the well known two-wave structure resulting from the {alpha}-{var_epsilon} phase transition beginning at 125 kbar. 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.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 7877
- Report Number(s):
- SAND99-0929C; TRN: US0101831
- Resource Relation:
- Conference: APS SCCM 99, Topical Conference on Shock Compression of Condensed Matter, Snowbird, UT (US), 06/27/1999--07/02/1999; Other Information: PBD: 10 Jun 1999
- Country of Publication:
- United States
- Language:
- English
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Isentropic compression experiments on the Sandia Z accelerator
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