Nanostructure development in refractory metals: ECAP processing of Niobium and Tantalum using indirect-extrusion technique |
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| Affiliation: | 1. Department of Materials Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia;2. Faculty of Mechanical and Electrical Engineering, Universidad Autónoma de Nuevo León (UANL), 66455 San Nicolás de los Garza, Mexico;3. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany;4. Hydrogen Research Institute, Universite du Quebec a Trois-Rivieres, Trois-Rivieres G9A 5H7, QC, Canada;1. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria;2. Montanuniversität Leoben, Institut für Struktur- und Funktionskeramik (ISFK), Peter-Tunner Straße 5, 8700 Leoben, Austria;3. Ceratizit Austria GmbH, Metallwerk-Plansee-Straße 71, 6600 Reutte, Austria;1. Centre for Materials Research and Sintering Technology, Institute of Advanced Manufacturing Technology, Krakow, 30-011, Poland;2. Institute of Pulsed Power Science, National University Corporation Kumamoto University, CHUO HU KUMAMOTO, 8608555, Japan;1. Department of Materials Science and Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;2. Department of Materials Science and Engineering, MUT, Tehran, Iran;1. UEMS, Department of Physics, CP 351, 79804-970 Dourados, MS, Brazil;2. IPEN, Center of Technology, Science and Materials, 05508-000 Sao Paulo, SP, Brazil;3. UFMS, Institute of Physics, 79070-900 Campo Grande, MS, Brazil;4. University of Sheffield, Department of Materials Science and Engineering, Sheffield S1 3JD, UK;5. UNESP, Department of Physics, UNESP, 17.033-360, Bauru, SP, Brazil;1. School of Engineering and Technology, China University of Geosciences-Beijing, 29 Xueyuan Road, Haidian, Beijing 100083, China;2. Key laboratory on Deep Geo-Drilling Technology of the Ministry of Land and Resources, China University of Geosciences-Beijing, 29 Xueyuan Road, Haidian, Beijing 100083, China;3. College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, 18 Fuxue Road, Changping, Beijing 102249, China;4. College of Petroleum Engineering, China University of Petroleum-Beijing, 18 Fuxue Road, Changping, Beijing 102249, China |
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| Abstract: | A modified ECAP die by implementing the principles of indirect extrusion was fabricated to process refractory metals of Niobium and Tantalum. The main advantage of this modified technique over conventional method of ECAP is the reduction of frictional force during extrusion. Finite Element Method was utilized to demonstrate the difference between the extruding loads during the process. Several samples of Niobium and Tantalum were subjected to ECAP in different passes. Analysis of experimental results demonstrated a dramatic improvement in mechanical properties. Similarly, microstructure and XRD analyses of the samples showed noticeable enhancement in grain refinement of metals towards nanoscale. |
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