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Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy |
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| Authors: | Ruslan Z Valiev Maxim Yu Murashkin Askar Kilmametov Boris Straumal Nguyen Q Chinh Terence G Langdon |
| Affiliation: | 1.Institute of Physics of Advanced Materials,Ufa State Aviation Technical University,Ufa,Russia;2.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka, Moscow district,Russia;3.Max-Planck-Institut für Metallforschung,Stuttgart,Germany;4.Department of Materials Physics,E?tv?s Loránd University,Budapest,Hungary;5.Departments of Aerospace & Mechanical Engineering and Materials Science,University of Southern California,Los Angeles,USA;6.Materials Research Group, School of Engineering Sciences,University of Southampton,Southampton,UK |
| Abstract: | Processing by severe plastic deformation (SPD) typically increases the strength of metals and alloys drastically by decreasing their grain size into the submicrometer or nanometer range but the ductility of such materials remains typically low. This report describes the first demonstration that it is possible to increase the room temperature ductility of aluminum-based alloys processed by SPD and to attain elongations to failure of >150% while retaining the enhanced strength. This unique combination of properties is due to the occurrence of grain boundary sliding at room temperature. The sliding was obviously achieved by introducing a grain boundary wetting of the aluminum/aluminum grain boundaries. |
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