X-ray diffraction measurements of plasticity in shock-compressed vanadium in the region of 10-70 GPa

被引：20

作者：

Foster, J. M. ^{[1
]}

Comley, A. J. ^{[1
]}

Case, G. S. ^{[1
]}

Avraam, P. ^{[1
]}

Rothman, S. D. ^{[1
]}

Higginbotham, A. ^{[2
]}

Floyd, E. K. R. ^{[1
]}

Gumbrell, E. T. ^{[1
]}

Luis, J. J. D. ^{[1
]}

McGonegle, D. ^{[3
]}

Park, N. T. ^{[1
]}

Peacock, L. J. ^{[1
]}

Poulter, C. P. ^{[1
]}

Suggit, M. J. ^{[3
]}

Wark, J. S. ^{[3
]}

机构：

[1] AWE Aldermaston, Reading RG7 4PR, Berks, England

[2] Univ York, York Plasma Inst, Dept Phys, York YO10 5DD, N Yorkshire, England

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

来源：

JOURNAL OF APPLIED PHYSICS | 2017年 / 122卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

CONSTITUTIVE MODEL; DEFORMATION;

D O I：

10.1063/1.4994167

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：13

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