冲击加载多晶体的X射线衍射
X-ray diffraction from shock-loaded polycrystals
摘要：
利用X射线衍射技术研究了多晶金属在纳秒量级的冲击压缩过程。激光烧蚀用于在25至125微米厚的Be多晶箔中诱导冲击波。使用第二激光脉冲通过照射Ti箔来产生等离子体X射线源。将X射线源准直以产生直径可控的光束，并将光束导向Be样品。从样品衍射X射线，并使用胶片和X射线条纹照相机检测。观察到衍射角随冲击压力而变化。衍射角与所用载荷条件下预期的单轴（弹性）和各向同性（塑性）压缩一致。多晶衍射将用于测量晶格对高冲击压力和相变的响应。
英文摘要：
X-ray diffraction was demonstrated from shock-compressed polycrystalline metal on nanosecond time scales. Laser ablation was used to induce shock waves in polycrystalline foils of Be, 25 to 125 microns thick. A second laser pulse was used to generate a plasma x-ray source by irradiation of a Ti foil. The x-ray source was collimated to produce a beam of controllable diameter, and the beam was directed at the Be sample. X-rays were diffracted from the sample, and detected using films and x-ray streak cameras. The diffraction angle was observed to change with shock pressure. The diffraction angles were consistent with the uniaxial (elastic) and isotropic (plastic) compressions expected for the loading conditions used. Polycrystalline diffraction will be used to measure the response of the crystal lattice to high shock pressures and through phase changes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
