Experimental investigation of dynamic compression and spallation of Cerium at pressures up to 6 GPa

18th APS-SCCM; 24th AIRAPT

Zubareva, A.N.^1 ; Kolesnikov, S.A.^1 ; Utkin, A.V.^1

Institute of Problems of Chemical Physics RAS, Academician Semenov Avenue 1, Chernogolovka

142432, Russia^1

关键词: Dynamic compression;    Experimental investigations;    Free surface velocity;    Isentropic compression;    Laser velocimeters;    Strong dependences;    Transition pressure;    Volumetric compressions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/3/032010/pdf
DOI  :  10.1088/1742-6596/500/3/032010

来源: IOP

【 摘 要 】

In this study the experiments on one-dimensional dynamic compression of Cerium (Ce) samples to pressures of 0.5 to 6 GPa using various types of explosively driven generators were conducted. VISAR laser velocimeter was used to obtain Ce free surface velocity profiles. The isentropic compression wave was registered for γ-phase of Ce at pressures lower than 0.76 GPa that corresponds to γ-α phase transition pressure in Ce. Shock rarefaction waves were also registered in several experiments. Both observations were the result of the anomalous compressibility of γ-phase of Ce. On the basis of our experimental results the compression isentrope of Ce γ-phase was constructed. Its comparison with volumetric compression curves allowed to estimate the magnitude of shear stress at dynamic compression conditions for Ce. Spall strength measurements were also conducted for several samples. They showed a strong dependence of the spall strength of Ce on the strain rate.