Abstract
The technique of magnetically driven quasi-isentropic compression is a new experimental technology which can generate dynamic ramp compression, and its load path lies between the quasi-static (isothermal) and shock compression (adiabatic process), it is a bridge to contact the two traditional loading techniques. In this paper, the phase transition experiments of iron were done under magnetically driven quasi-isentropic compression technology on the facility CQ-4, and the effect of acoustic impedance on the interface velocity was analyzed. Simulation with multi-phase equation of state also was done to analyze the phase transition, and the simulations show that the phase transition relaxation time is about 30ns, and that the phase transition pressure is about 13 GPa, and that the numerical and experimental interface velocities are essentially coincident. With the analysis of evolution of the stress wave in the sample, it shows that the sound speed drop and the acoustic impedance of the window are the main factors to affect the interface velocity waveform.
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