The nanocrystalline structure formation in germanium subjected to severe plastic deformation |
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| Affiliation: | 1. Centre of Structural Investigations, Ufa State Aviation Technical Univ., Ufa 450000, Russia;2. Department of Metal Physics, Charles University, 12116 Praha 2, Czech Republic, Russia;3. Inst. of Metals Superplasticity Problems, Russian Academy of Sciences, Ufa 450001, Russia;4. Zentrum fur Funktionswerkstoffe, Windausweg 2, 37073 Gottingen, Germany;1. Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Leoben, Austria;2. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria;3. Vacuumschmelze GmbH & Co KG (VAC) Rapid Solidification Technology, Hanau, Germany;4. Research Group Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, Vienna, Austria;5. Research Group Physics of Functional Materials, Faculty of Physics, University of Vienna, Vienna, Austria;1. Kibo Utilization Center, Japan Aerospace Exploration Agency, 2-1-1, Sengen, Tsukuba 305-8505, Japan;2. Nanoelectronics Research Institute, AIST, Higashi, Tsukuba 305-8562, Japan;3. Graduate School of Engineering, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;1. Department of Physics, Central Tehran Branch, Islamic Azad University, Tehran, Iran;2. Photonics & Quantum Technologies Research School, Nuclear Science and Technology Research Institute, 11155-3486 Tehran, Iran;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;1. Institute of Strength Physics and Materials Science SB RAS, Tomsk 634055, Russia;2. Institute of Continuous Media Mechanics UB RAS, Perm 614013, Russia |
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| Abstract: | The peculiarities of nanocrystalline (NC) structure formation in germanium subjected to severe plastic deformation (SPD) are examined in this paper. Transmission electron microscopy (TEM), X-ray analysis and differential scanning calorimetry were employed in the structural study of germanium specimens. The crystal-to-amorphous transition induced by SPD in germanium is observed. The NC structure formation is the result of annealing at 850°C. Crystallites in the NC state have non-equilibrium grain boundaries (GB) and a particular “spread” diffraction contrast, observed by TEM, testifies to this. |
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