Shock induced melting of sapphire

Ostrik, A.; Nikolaev, D.

Авторы: Ostrik A., Nikolaev D.
Журнал: Journal of Physics: Conference Series
Том: 2154
Номер: 1
Год издания: 2022
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 012010
DOI: 10.1088/1742-6596/2154/1/012010
Аннотация: The method for calculation the melting curves of crystalline bodies based on theDebye model of heat capacity and the Lindemann melting rule is proposed. Hugoniot shockadiabate, determined in dynamic experiments and thermophysical characteristics of thesubstance under normal conditions are used as input data. Mathematically, the calculation ofthe melting curve is reduced to the Cauchy problem for a system of ordinary differentialequations. This system is solved numerically by the Runge-Kutta method. Using the proposedmethod, the melting curves of copper, silver, gold, and sapphire at high pressures arecalculated. The results obtained for copper, silver and gold were compared with availablecalculated and experimental data to validate the method. Experiments on shock compression oftransparent sapphire samples were performed, using a Mach-type cumulative explosivegenerators. Investigated pressure range (280-1350 GPa) covered a region of shock-inducedmelting. The temperature of shock front was registered by fast optical pyrometer together withshock velocity. Particle velocity and pressure were obtained by impedance matching technique.Satisfactory agreement of calculated and experimental data on temperature of melting behindthe shock wave front in sapphire was obtained.
Добавил в систему: Острик Афанасий Викторович

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