Abstract
Shock wave is associated with dynamic loading that can result in phase transition (PT), optical and mechanical property changing, and chemical reaction on materials. Here, we report recent progress about shock-induced PT of polycrystalline iron, the underlying mechanism of the optical emission from sapphire, and the synthesis from single-phase RuSi in the National Key Laboratory of Shock Wave and Detonation Physics. Results indicated that grain boundary (GB) could affect the PT pressure threshold and rate of iron, the pressure threshold decreases with decreasing GB defects, and the PT rate shows a variation with increasing GB size; wavelength-dependent optical emissivity (non-gray-body emission) would be generated that was not revealed previously for shocked sapphire, and the observed luminescence was from the shock-induced shear bands, but without superheating phenomenon; shock compression could be an effective way to synthesis Ru-Si nanocrystals, when the shock pressure was appropriate; and Ru-Si powder could completely transform to fine-grain structure CsCl-type Ru-Si at 40.4 GPa.
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Acknowledgments
This work was partially supported by the National Natural Science Foundation of China (U1230202, 11072227 and 11272294), the Foundation of National Key Laboratory of Shock Wave and Detonation Physics (9140C670302130C67239), and the Science and Technology Foundation of China Academy of Engineering Physics (2012A0201007).
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SPECIAL TOPIC: High Pressure Physics
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Cao, X., Li, T., Li, X. et al. Shock wave on materials. Chin. Sci. Bull. 59, 5302–5308 (2014). https://doi.org/10.1007/s11434-014-0646-2
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DOI: https://doi.org/10.1007/s11434-014-0646-2