Time-dependent effects in melting and phase change for laser-shocked iron
Time-dependent effects in melting and phase change for laser-shocked iron
复制标题
激光冲击铁的熔化和相变随时间变化的影响
DOI：
10.1103/physrevresearch.2.033366
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发表时间：
2020
影响因子：
4.2
通讯作者：
White S
中科院分区：
文献类型：
--
作者：
White S
利用斯坦福大学直线加速器相干光源国家加速器实验室的直线加速器相干光源设备，我们观察到了X射线散射从铁压缩与激光驱动的冲击地球核心一样的压力超过400 GPa。数据显示的情况下，熔化是不完整的，我们观察到六方密堆积的晶体结构在冲击压缩密度高达14.0 g，但没有证据表明的双六方密堆积晶体。在这些密度下观察到的晶体结构，其中冲击加热预计超过平衡熔体温度，可能表明固体过热。这些结果是重要的状态方程建模在高应变率相关的影响场景和激光驱动的冲击波实验。
Using the Linac Coherent Light Source facility at the Stanford Linac Coherent Light Source National Accelerator Laboratory, we have observed x-ray scattering from iron compressed with laser-driven shocks to earth-core-like pressures above 400 GPa. The data show cases where melting is incomplete and we observe hexagonal-close-packed crystal structure at shock compressed densities up to 14.0 gbut no evidence of a double-hexagonal-close-packed crystal. The observation of a crystalline structure at these densities, where shock heating is expected to be in excess of the equilibrium melt temperature, may indicate superheating of the solid. These results are important for equation of state modeling at high strain rates relevant for impact scenarios and laser-driven shock-wave experiments.