Measurement of iron characteristics under ramp compression  

作　　者：魏会冈 E Brambrink N Amadou A Benuzzi-Mounaix A Ravasio G Morard F Guyot T de Rességuier N Ozaki K Miyanishi 赵刚 M Koenig 

机构地区：[1]Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences [2]LULI-CNRS, Ecole Polytechnique, CEA, Université Paris-Saclay [3]Sorbonne Universités, UPMC Univ Paris 06, CNRS, laboratoire d'utilisation des lasers intenses (LULI) [4]Département de Physique, Université Abdou Moumouni de Niamey [5]Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Sorbonne Universités-UPMC, UMR CNRS 7590,Muséum National d'Histoire Naturelle [6]Institut Pprime, CNRS, ENSMA, Univ.Poitiers [7]Graduate School of Engineering, Osaka University

出　　处：《Chinese Physics B》2017年第11期360-364,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2013CBA01503);the National Natural Science Foundation of China(Grant No.11103040)

摘　　要：Laser-driven ramp compression was used to investigate iron characteristics along the isentropic path. The iterative Lagrangian analysis method was employed to analyze the free surface velocity profiles in iron stepped target measured with two VISARs. The onset stress for the α to ε phase transformation was determined from the sudden change in the sound velocity and was found over-pressurized compared to the static and shock results. The derived stress（26 GPa） and strain rate（up to 10-8 s^-1） are consistent with our previous experimental results. The stress-density relations were compared with those from previous ramp experiments and good agreements were found, which experimentally confirms the simulations,showing that iterative Lagrangian analysis can be applied to the ramp-compression data with weak shock.Laser-driven ramp compression was used to investigate iron characteristics along the isentropic path. The iterative Lagrangian analysis method was employed to analyze the free surface velocity profiles in iron stepped target measured with two VISARs. The onset stress for the α to ε phase transformation was determined from the sudden change in the sound velocity and was found over-pressurized compared to the static and shock results. The derived stress（26 GPa） and strain rate（up to 10-8 s^-1） are consistent with our previous experimental results. The stress-density relations were compared with those from previous ramp experiments and good agreements were found, which experimentally confirms the simulations,showing that iterative Lagrangian analysis can be applied to the ramp-compression data with weak shock.

关 键 词：isentropic compression iron phase transformation 

分 类 号：P144[天文地球—天体物理]