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Research on viscosity of metal at high pressure

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Abstract

A new experimental technique, the flyer-impact method, is proposed in this article to investigate the viscosity coefficient of shocked metals. In this technique, a shock wave with a sinusoidal perturbation on the front is induced by the sinusoidal profile of the impact surface of the sample by use of a two-stage light-gas gun, and the oscillatory damping process of the perturbation amplitude is monitored by electric pins. The damping processes of aluminum at 78 and 101 GPa and iron at 159 and 103 GPa are obtained by this technique, which supplement the existing data by measuring the viscosity coefficient via a dynamic high-pressure method. Applying the formula of Miller and Ahrens to fit the experimental data, the shear viscosity coefficients of aluminum at 78 and 101 GPa are \(1350\,\pm \,500\) and \(1200\,\pm \,500~\hbox {Pa}\,\hbox {s}\), respectively, and those of iron at 159 and 103 GPa are \(1150\,\pm \,1000\) and \(4800\,\pm \,1000~\hbox {Pa}\,\hbox {s}\), respectively. The values measured by the flyer-impact method, approximately \(10^{3}~\hbox {Pa}\, \hbox {s}\), are consistent with those measured by Sakharov’s method, while still greatly differing from those measured by static high-pressure methods. In dynamic high-pressure experiments, the shear viscosity is related to dislocation motion in the solid material, while that in static high-pressure experiments is related to the diffusion motion of atoms or molecules in liquids. Therefore, there are different physical meanings of shear viscosity in dynamic and static high-pressure experiments, and there is no comparability among these results.

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Acknowledgments

The authors thank Y.H. Li, and X.D. Xue for their help in gas-gun operation. The authors are grateful for the support from the National Science Foundation of China under Contract No. 10974160.

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Authors and Affiliations

  1. Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu, 610031, People’s Republic of China

    Y. Li, F. Liu, X. Ma & M. Zhang

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  1. Y. Li
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  2. F. Liu
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Correspondence to F. Liu.

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Communicated by N. Thadhani and A. Higgins.

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Li, Y., Liu, F., Ma, X. et al. Research on viscosity of metal at high pressure. Shock Waves 26, 759–770 (2016). https://doi.org/10.1007/s00193-015-0604-1

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