Hysteresis and Kinetic Effects During Liquid-Solid Transitions

Streitz, F H ; Chau, R

关键词: BISMUTH;    COMPRESSION;    ELECTRIC CONDUCTIVITY;    FOCUSING;    HYSTERESIS;    KINETICS;   

DOI  :  10.2172/975223
RP-ID  :  LLNL-TR-411089
PID  :  OSTI ID: 975223
Others  :  TRN: US1002825

学科分类：凝聚态物理

美国|英语

来源: SciTech Connect

【 摘 要 】

We address the fundamental issue of phase transition kinetics in dynamically compressed materials. Focusing on solid bismuth (Bi) as a prototype material, we used a variety of time-resolved experiments including electrical conductivity and velocimetry to study the phase transition kinetics of the solid-solid phase transitions. Simple single shock experiments performed on several low-lying high pressure phases of Bi, revealed surprisingly complex behavior and slow dynamics. Strong hysteresis effects were observed in the transition behavior in experiments where the compressed Bi was allowed to release back across a phase line. These experiments represent the first reported simultaneous use of resistivity and velocimetry in a shock compression experiment, and the first observation of hysteresis effects occurring during dynamic compression and release.