Interface instability in the drawing process of copper/tantalum conductors |
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| Affiliation: | 1. Service National des Champs Magnétiques Pulsés, CNRS–UPS–INSA, 118, Route de Narbonne, 31062 Toulouse Cedex, France;2. Laboratoire de Physique de la Matière Condensée, CNRS–UPS–INSA, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France;3. Laboratoire de Métallurgie Physique—SP2MI, Bd. 2, Teleport 2, 86960 Futuroscope Cedex, France;1. Department of Forensic Medicine, Guangdong Medical University, Dongguan, China;2. Center of Forensic Sciences, Bureau of Public Security of Guangxi Zhuang Autonomous Region, Nanning, China;3. Health Gene Technologies Co. Ltd., Ningbo, China;4. Department of Criminal Investigation, Bureau of Public Security of Guilin City, Guilin, China;1. Department of Microbiology, School of Biology, College of Science, University of Tehran, Tehran, Iran;2. Department of Chemical and Petroleum Engineering, Faculty of Science, Sharif University of Technology, Tehran, Iran;1. Boreskov Institute of Catalysis, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia;2. Novosibirsk State University, St. Pirogova 2, 630090 Novosibirsk, Russia;3. St. Petersburg State University, 7-9, Universitetskaya nab., 198504 St. Petersburg, Russia;4. Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany;1. School of Veterinary and Life Sciences, Murdoch University, Australia;2. Africa Research Group, Murdoch University, Australia;3. Sir Walter Murdoch School of Public Policy and International Affairs, Murdoch University/African Development Bank, Australia |
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| Abstract: | Copper/tantalum test billets have been cold drawn, using the process developed for the elaboration of copper/niobium multifilamentary conductors, for the development of high strength and high conductivity conductors for high pulsed magnetic fields. After a section reduction of 60%, a macroscopic roughness of the tantalum surface has been observed: two sets of perpendicular undulations developed (parallel and perpendicular to the drawing axis), with wavelengths in the 100 μm range. This phenomenon, observed for the first time on bulk materials, is interpreted in terms of the Grinfeld instability: the associated wavelength, calculated in the case of a shear stress discontinuity at the interface between b.c.c. tantalum and f.c.c. copper, is found in the right magnitude range. |
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