X-Ray diffraction measurements of plasticity in shock-compressed vanadium in the region of 10-70 GPa
X-Ray diffraction measurements of plasticity in shock-compressed vanadium in the region of 10-70 GPa
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DOI：
10.1063/1.4994167
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发表时间：
2017-07
影响因子：
3.2
通讯作者：
J. Foster;A. Comley;G. S. Case;P. Avraam;S. Rothman;A. Higginbotham;E. Floyd;E. Gumbrell;J. Luis;D. McGonegle;N. Park;L. Peacock;C. P. Poulter;M. Suggit;J. Wark
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文献类型：
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作者：
J. Foster;A. Comley;G. S. Case;P. Avraam;S. Rothman;A. Higginbotham;E. Floyd;E. Gumbrell;J. Luis;D. McGonegle;N. Park;L. Peacock;C. P. Poulter;M. Suggit;J. Wark
我们报告了从多晶钒箔中记录粉末衍射数据的实验，冲击压缩到10-70 GPa的压力范围内。从Debye-Scherrer衍射图像的不对称性推断压缩材料中的各向异性应变，并用于推断钒样品材料的残余应变和屈服强度（残余von Mises应力）。我们发现，在冲击压力低于30 GPa时，与屈服强度对应的残余各向异性应变在1.2 - 1.8 GPa范围内，而在高于30 GPa的冲击压力范围内，应变的各向异性明显减小。这与我们使用多尺度晶体塑性强度模型对实验数据的模拟形成对比，其中显著的屈服强度持续到我们在实验中获得的最高压力。讨论了冲击压力≥30gpa时钒的动态响应的可能机制。
We report experiments in which powder-diffraction data were recorded from polycrystalline vanadium foils, shock-compressed to pressures in the range of 10–70 GPa. Anisotropic strain in the compressed material is inferred from the asymmetry of Debye-Scherrer diffraction images and used to infer residual strain and yield strength (residual von Mises stress) of the vanadium sample material. We find residual anisotropic strain corresponding to yield strength in the range of 1.2 GPa–1.8 GPa for shock pressures below 30 GPa, but significantly less anisotropy of strain in the range of shock pressures above this. This is in contrast to our simulations of the experimental data using a multi-scale crystal plasticity strength model, where a significant yield strength persists up to the highest pressures we access in the experiment. Possible mechanisms that could contribute to the dynamic response of vanadium that we observe for shock pressures ≥30 GPa are discussed.