Abstract
Two types of planar impact experiments were performed with
[100]-oriented single crystals of potassium chloride (KCl) having
initial temperatures ranged from 293 to 523 K. In the experiments of the
first type the maximum impact strength did not exceed the pressure
Ptr of B1-B2 transformation in KCl. In these experiments the
aluminum buffers were placed between the impactor and the sample and the
velocity of aluminum-KCl interface was measured by VISAR. The impact
strength in the experiments of the second type (with copper buffers) was
higher than Ptr and the VISAR was used for monitoring the
free surface velocity of the KCl samples. Temperature dependencies of
the longitudinal and the bulk sound velocities obtained in the
experiments of the first type were used for the treatment of the results
of the second-type experiments. The results show clearly the
deceleration of the B1-B2 transformation kinetics and the increase of
the KCl yield strength with temperature. Similar temperature-induced
strengthening was observed recently in aluminum single crystals [G.I.
Kanelet et al, J. Appl. Phys. 90, (2001) 136]. The value of the
transformation entropy determined from the temperature dependence of
Ptr is found to be close to zero.
Original language | English |
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Title of host publication | Shock Compression of Condensed Matter. AIP Conference Proceedings |
Pages | 735-738 |
Volume | 706 |
DOIs | |
State | Published - 1 Jul 2004 |
Keywords
- Mechanical testing impact tests static and dynamic loads
- Deformation and plasticity
- Solid-solid transitions
- High-pressure and shock wave effects in solids and liquids