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Fizika Goreniya i Vzryva, 2014 Volume 50, Issue 3, Pages 113–121 (Mi fgv137)

This article is cited in 10 papers

Phase transitions in shock-loaded titanium at pressures up to 150 GPa

V. A. Borissenoka, M. V. Zhernokletovab, A. E. Kovalevb, A. M. Poduretsab, V. G. Simakovab, M. I. Tkachenkob

a Sarov Physical-Technical Institute of National Research Nuclear University "MEPhI", Sarov, 607186, Russia
b Institute of Physics of Explosion, Institute of Experimental Physics (VNIIEF), Federal Nuclear Center, Sarov, 607188, Russia

Abstract: Phase transformations in VT1-0 titanium were studied. Shock profiles in the pressure range of 10–26 GPa were recorded by polyvinylidene fluoride sensors. Sound velocities in shock-compressed titanium samples were measured by two methods. At a pressure less than 30 GPa, the speed of sound in titanium was determined by the counter unloading method using Manganin gauges, and at a pressure of 30–150 GPa, it was determined by the overtaking unloading method using indicator liquids. At a pressure of 20–40 and 60–90 GPa, the pressure dependences of the speed of sound have breaks, the first of which is apparently associated with the $\alpha\to\omega$ conversion, and the second with melting. X-ray analysis revealed the presence of the $\omega$ phase in the samples in steel capsules recovered after loading at a pressure of 9–23 GPa. The dependence of the yield of the $\omega$ phase on the loading pressure has the form of a curve with a maximum at $\approx$ 15 GPa.

Keywords: titanium, Hugoniot, phase transition, melting, speed of sound.

UDC: 533.6.011.72

Received: 17.04.2013


 English version:
Combustion, Explosion and Shock Waves, 2014, 50:3, 346–353

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