Extended X-Ray Absorption Fine Structure Measurements of Laser Shocks in Ti and V and Phase Transformation on Ti
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY
OAK-B135 A laser-source-based Extended X-Ray Absorption Fine Structure (EXAFS) measurement has been used to study the properties of laser-shocked metals on a nanosecond time scale. The ability of measuring shock-induced temperatures of the order of 0.1 eV is essentially unique to EXAFS. EXAFS measurement of vanadium shocked to {approx}0.5 Mbar with a 3-ns laser pulse yields a compression and temperature in good agreement with hydrodynamic simulations and with shock-speed measurements. In laser-shocked titanium at the same pressure, the EXAFS modulation damping is much higher than warranted by the increase in temperature. This is explained by the a-Ti to w-Ti phase transformation known to occur around {approx}0.1 Mbar in the longer (ms) shocks obtained in shock-gun experiments. In the w-Ti phase, the disparate neighbor distances cause a beating of the modulation frequencies and thus an increased damping. These results demonstrate that EXAFS measurements can be used for the study of nanosecond-scale shocks and phase transformation in metals.
- Research Organization:
- Laboratory for Laser Energetics (US)
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FC03-92SF19460
- OSTI ID:
- 823153
- Report Number(s):
- DOE/SF-19460-532; 1442; 2003-147
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 11
- Country of Publication:
- United States
- Language:
- English
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