一维平面磁驱动等熵加载发射飞片技术

Launch technique for isentropic compression flyer plates magnetically driven by using fast pulsed power

探索了一维平面磁驱动发射飞片的实验技术,实现了在一个样品上同时发射两个不同厚度的飞片,并利用VISAR测试技术同时获得了两个飞片自由面完整的速度历史。其中在回路放电峰值电流密度为823 kA/cm的情况下,在上升前沿2μs内将厚度为0.38 mm、直径为4 mm的铝飞片发射到1.5 km/s,作用在飞片上的最大磁压力为4.25 GPa。显微分析发现,在飞片速度较高的情况下,飞片与镗孔底部剪切破坏的断口上,由于凝固过程中过冷度大有非晶等现象出现。进一步促进了磁驱动等熵加载、发射飞片实验技术、物态方程研究的开展。

Experiments were performed to investigate the magnetically accelerating flyers using fast pulsed power. Two flyers with different thicknesses were launched simultaneously, and their velocity histories were recorded by VISAR. When the maximum current density was 823 kA/cm, the flyer 0.38 mm in thickness and 4 mm in diameter could be accelerated to the velocity of 1.5 km/s in 2 μs, and its maximum magnetic loading pressure was 4.25 GPa. It was observed from the metallographs that when flyer velocity was high, there was amorphous body on the shear fracture zone at the bottom of the counterbore left by the flyer due to large degree of supercooling in freezing. This work will be helpful to further development of isentropic compression technique and the study of equation of state.