铈低压冲击相变数值模拟研究  

Numerical study of shock-induced phase transformation of cerium under low pressure

作　　者：潘昊[1,2] 胡晓棉[1,2] 吴子辉[1] 戴诚达[3] 吴强[3] 

机构地区：[1]北京应用物理与计算数学研究所,北京100088 [2]北京应用物理与计算数学研究所,计算物理国家重点实验室,北京100088 [3]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理实验室,绵阳621900

出　　处：《物理学报》2012年第20期351-357,共7页Acta Physica Sinica

基　　金：爆炸科学与技术国家重点实验室开放基金(批准号:KFJJ11-5M)资助的课题~~

摘　　要：对金属铈低压冲击γ→α相变进行了数值模拟研究.冲击加载实验的速度剖面结果表明,铈的低压相变过程中两相之间的转换较为光滑,无明显间断,其相变过程存在动态因素.通过分析金属铈低压冲击加载和卸载下的典型物理过程,对材料本构关系、Hugoniot关系和相变与逆相变过程进行了理论研究.获取了铈低压相变前后的本构关系及状态方程,并建立了非平衡相变理论模型.数值计算结果与平面冲击实验符合较好,表明该相变动态模型能够较好地描述铈的低压冲击加载和卸载过程.The dynamic responses of cerium under low pressure, including γ→α phase transition, are numerically studied in this paper. The velocity profiles of shock experiments show that the transition process between the two phases is smooth and there is no obvious disconnection between the two plastic waves of the particle velocity profiles. Three important problems in the dynamic response, including constitutive model, Hugoniot relation and phase transition/reversal, are discussed. A multi-phase equation of state and constitutive model of Ce are presented in this paper after analyzing the typical wave configuration of cerium under the shock loading and releasing. The dynamic phase transition model is built for the non-equilibrium course in the phase γ→α transition induced by shock wave. The numerical results accord with the experimental data of the plane impact tests, indicating that the dynamic phase transition model can describe the dynamic response under low pressure of cerium more reasonably.

关 键 词：相变 冲击波 本构关系 铈 

分 类 号：TG146.45[一般工业技术—材料科学与工程]