| Numéro |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
|
|
|---|---|---|
| Page(s) | 971 - 976 | |
| DOI | https://doi.org/10.1051/jp4:2006134148 | |
| Publié en ligne | 26 juillet 2006 | |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 971-976
DOI: 10.1051/jp4:2006134148
Dynamic strength of uranium at high temperatures
E. Zaretsky1, B. Herrmann2 and D. Shvarts21 Mechanical Engineering Dept., Ben Gurion University, PO Box 653, Beer-Sheva, Israel
2 Nuclear Research Center - Negev, PO Box 9001, Beer-Sheva, Israel
Published online: 26 July 2006
Abstract
Unalloyed uranium (PU) and uranium-0.78 wt% Ti alloy (UT) were
studied in VISAR-monitored planar impact experiments with initial
sample temperatures ranged from 27
C to 860C. The
recorded waveforms was used for obtaining the stress-strain
and deviator stress-strain
diagrams, the conventional elastic limit Y0.2, and the spall
strength of the alloys at different testing temperatures. The
strengths Y0.2 of both the materials stay almost constant up to
the temperature of
transformation, increase strongly
in the 
-phase domain, and abruptly drop above the temperature
of
transformation. The temperature dependences of
the spall strength of alloys differ from those of the compressive
strengths indicating the prevailing role of the void nucleation
(over the void growth) in the spallation process. The most striking
finding of the work is the existence of 
-uranium at
pressures some 3 GPa higher than that permitted thermodynamically.
The life time and the borders of existence of this non-equilibrium
phase are unknown and should be determined in future.
© EDP Sciences 2006