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Microstructure and mechanical properties of pure gold processed by equal channel angular pressing
Authors:A.V. Nagasekhar   T. Rajkumar   D. Stephan   Y. Tick-Hon  R.K. Guduru
Affiliation:1. College of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China;2. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, PR China;3. Department of Mechanical and Electronic Engineering, Hebei College of Industry and Technology, Shijiazhuang 050091, PR China;1. Los Alamos National Laboratory, Sigma Division, Los Alamos, NM, USA;2. George S. Ansell Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA;3. Department of Physics and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, MA, USA;4. Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA;1. Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany;2. Material Mechanics, RWTH Aachen University, Aachen, Germany;3. The School of Materials, The University of Manchester, Manchester, UK;4. Institut Pprime, Physics and Mechanics of Materials Department, UPR CNRS 3346, ISAE-ENSMA, 1 avenue Clément Ader, BP 40109, 86961 Futuroscope-, Chasseneuil, France;5. Department of Materials, Imperial College, South Kensington, London SW7 2AZ, UK;1. Institute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), Haid-und-Neu-Str. 7, 76131 Karlsruhe, Germany;2. Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Moltkestrasse 30, D 76133 Karlsruhe, Germany;3. Lehrstuhl für Informatik 10 (Systemsimulation), Universität Erlangen-Nürnberg, Martensstraße 5a, 91058 Erlangen, Germany;4. Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Materialphysik im Weltraum, Linder Höhe, 51170 Köln, Germany;5. Dept. of Materials Science and Engineering, University of Alabama at Birmingham, 1720 2nd Ave. S, Birmingham, AL 35294, USA;1. State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;2. College of Applied Science, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, PR China;3. School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China;4. Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR), 51170 Köln, Germany
Abstract:The microstructure and mechanical properties of pure gold were examined after different number of equal channel angular pressing passes. The hardness and 0.2% proof stress from the compression tests were observed to increase only up to the fourth pass whereas the compressive strength at 40% strain kept increasing gradually with increasing the number of passes. Microstructure with low angle grain boundaries and shear bands were observed until the eighth pass and equiaxed grains with high angle grain boundaries were observed only after the twelfth pass.
Keywords:Gold   ECAP   ECAE   SPD   Mechanical properties   Microstructure
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