Extended X-ray absorption fine structure measurements of laser-shocked V and Ti and crystal phase transformation in Ti.
Extended x-ray absorption fine structure (EXAFS), using a laser-imploded target as a source, can yield the properties of laser-shocked metals on a nanosecond time scale. EXAFS measurements of vanadium shocked to approximately 0.4 Mbar yield the compression and temperature in good agreement with hydrodynamic simulations and shock-speed measurements. In laser-shocked titanium at the same pressure, the EXAPS modulation damping is much higher than is warranted by the predicted temperature increase. This is shown to be due to the alpha-Ti to omega-Ti crystal phase transformation, known to occur below approximately 0.1 Mbar for slower shock waves.
Yaakobi
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B
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
Meyerhofer
D D
DD
Boehly
T R
TR
Rehr
J J
JJ
Remington
B A
BA
Allen
P G
PG
Pollaine
S M
SM
Albers
R C
RC