Ultrafine grain formation in face centered cubic metals during severe plastic deformation |
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| Authors: | T. Sakai H. Miura X. Yang |
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| Affiliation: | 1. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan;2. Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan;3. Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan;1. Karlsruher Institut für Technologie, Institut für Nanotechnologie, Eggenstein-Leopoldshafen, Germany;2. Donetsk Institute for Physics and Engineering named after O.O.Galkin of the National Academy of Sciences of Ukraine, Kyiv, Ukraine;3. Scientific Center and Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia;4. National University of Science and Technology «MISIS», Moscow, Russia;1. Karlsruher Institut für Technologie, Institut für Nanotechnologie, 76344, Eggenstein-Leopoldshafen, Germany;2. Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Russia;3. Laboratory of Hybrid Nanomaterials, National University of Science and Technology «MISIS», Leninskii prosp. 4, 119049, Moscow, Russia;4. Commissariat à l''Energie Atomique et aux Energies Alternatives, DEN/DANS/DMN/SRMA and DRF/IRAMIS/LSI, 91191, Gif-sur-Yvette, France;5. A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii prosp. 49, 117991, Moscow, Russia;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;2. Tsinghua University, Beijing 100084, China;1. Institute of Solid State Physics RAS, Chernogolovka, Russia;2. National Research University Higher School of Economics, Moscow, Russia |
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| Abstract: | The evolution mechanisms of new high-angle boundaries as well as ultrafine grains at large strains were studied by means of multidirectional forging (MDF) of pure copper at low temperature and aluminum alloy at high temperature, where dynamic recovery operates as a main restoration process. The structural changes can be characterized by the evolution of deformation bands such as microshear or kink bands at moderate strains. Multidirectional forging accelerates the evolution of many mutually crossing microshear or kink bands developed in various directions. The misorientations between (sub)grains increased gradually with increasing cumulative strain, finally leading to the development of a new fine-grained structure. The dynamic grain formation can be resulted from in situ or continuous dynamic recrystallization which is discussed in detail. |
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