Shock-compressed graphite to diamond transformation on nanosecond time scales

Article

关键词: X-RAY-DIFFRACTION;    PHASE-TRANSFORMATION;    ORIENTED GRAPHITE;    EXPLOSIVE SHOCK;    BORON-NITRIDE;    HIGH-PRESSURE;    CARBON;    TEMPERATURE;    TRANSITION;    PARAMETERS;   

DOI  :  10.1103/PhysRevB.87.174104

来源: SCIE

【 摘 要 】

Numerical simulations of previous plane shock wave measurements on highly oriented pyrolytic graphite (HOPG), shocked to four peak stresses ranging from 27 to 50 GPa, are presented to address a long-standing question: When is the diamond phase formed in the shock-compressed graphite to diamond transition? A multiphase material description was developed to simulate measured wave profiles in shocked HOPG. Our results showed good agreement with the measured profiles for all four peak stresses and demonstrated the following: Transformation is completed in less than 10 ns, the density and stiffness of the high-pressure phase match that of cubic diamond, and the mechanical response of the diamond phase is nonlinear elastic.

【 授权许可】

Free