在冲击波纳秒加载过程中水的结晶相变及其动力学现象  

Phase transition dynamics of the crystallization of water under shock wave loading in nanoseconds

作　　者：李永宏[1] 刘福生[1] 程小理[1] 张明建[1] 薛学东[1] 

机构地区：[1]西南交通大学高压科学与技术实验室,成都610031

出　　处：《中国科学：物理学、力学、天文学》2011年第8期955-959,共5页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金资助项目(批准号:10874141)

摘　　要：在一级轻气炮加载实验中,利用光透射测量技术在线观测了水在多次冲击下发生结晶相变的动力学过程.实验研究表明:当水被压缩到液-固相边界附近,在界面效应的作用下,处于亚稳状态的水迅速局部结晶成核,并且在数十个纳秒内达到对入射光产生散射效应的尺度.固相体积分数随压力递增而增加,当样品中的压力达到平衡时结晶速率逐渐变缓.The dynamic process of the liquid to solid phase transition of water under multiple shock wave compressions was monitored using time-resolved optical transmission measurements.When the water sample was compressed to its second time of 2.21 GPa,near the border of the liquid-solid phase transition line,the metastable water nuclearyed crystal rapidly under the effect of the interface effects,and the size of the crystal was produced to the scattering of incident light effect in dozens of nanoseconds.The volume of the solid phase was found to increase with increasing pressure.The rate of crystallization decreased when pressure tended towards saturation.

关 键 词：冲击 液-固相变 透射率 

分 类 号：O414.13[理学—理论物理]