Anisotropic Shock Propagation in Single Crystals
Anisotropic Shock Propagation in Single Crystals
复制标题
单晶中的各向异性冲击传播
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Loubeyre
中科院分区：
文献类型：
--
作者：
J. Eggert;D. Hicks;P. Celliers;D. Bradley;J. Cox;W. Unites;Gilbert W. Collins;R. McWilliams;R. Jeanloz;S. Bruygoo;P. Loubeyre
大多数单晶激波实验都是在高对称方向上进行的，而在低对称方向上激波传播的性质还相对缺乏研究。众所周知，在低对称方向上传播的小振幅线性声波可以聚焦和/或形成焦散（Wolfe, 1995）。在本报告中，我们提供了在硅和金刚石单晶中传播的非线性（激波）的类似聚焦行为的证据。使用强激光，我们驱动非平面（发散几何）冲击波穿过单晶硅或金刚石，进入各向同性的背板。在恢复后，我们观察到一个凹陷，显示各向异性塑性应变的证据，具有明确的晶体配准。我们分别观察到[100]、[110]和[111]取向晶体的4倍、2倍和3倍对称印痕。
Most single-crystal shock experiments have been performed in high-symmetry directions while the nature of shock propagation in low-symmetry directions remains relatively unstudied. It is well known that small-amplitude, linear acoustic waves propagating in low-symmetry directions can focus and/or form caustics (Wolfe, 1995). In this report we provide evidence for similar focusing behavior in nonlinear (shock) waves propagating in single crystals of silicon and diamond. Using intense lasers, we have driven non-planar (divergent geometry) shock waves through single-crystals of silicon or diamond and into an isotropic backing plate. On recovery of the backing plates we observe a depression showing evidence of anisotropic plastic strain with well-defined crystallographic registration. We observe 4-, 2-, and 3-fold symmetric impressions for [100], [110], and [111] oriented crystals respectively.