Abstract
The aim of this work is to determine the melting temperature of boron carbide at high shock pressures. To this end, powder boron carbide samples have been compressed by shock waves with an amplitude of 60–80 GPa. Shocked samples have been recovered for the subsequent electron microscopy, X-ray spectroscopy, and X-ray diffraction analyses. The event of sample melting has been identified by the disappearance of boundaries between particles of the recovered initially powder sample. The pressure and temperature of shocked particles of boron carbide powder have been calculated using a hydrocode based on the previously developed equations of state for boron carbide and experimental setup materials. The average melting temperature of the boron carbide has been determined as Tml = 1900(500) K at the pressure Pml = 70(10) GPa.
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Acknowledgments
This work was performed using equipment of the unique Experimental Explosive Facility, Institute of Problems of Chemical Physics, Russian Academy of Sciences, and equipment of the Joint Analytical Center, Institute of Problems of Chemical Physics, Russian Academy of Sciences.
Funding
This work was supported by the Presidium of the Russian Academy of Sciences (basic research program “Condensed Matter and Plasma at High Energy Densities”) and by the Russian Federal Agency for Scientific Organizations (project no. AAAA-A19-119071190040-5).
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 12, pp. 838–845.
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Molodets, A.M., Golyshev, A.A. & Shilov, G.V. Melting of Shocked Boron Carbide. Jetp Lett. 111, 720–726 (2020). https://doi.org/10.1134/S0021364020120103
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DOI: https://doi.org/10.1134/S0021364020120103