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An evaluation of microstructure and microhardness in copper subjected to ultra-high strains |
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| Authors: | A P Zhilyaev S Swaminathan A A Gimazov T R McNelley T G Langdon |
| Affiliation: | 1. Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalúrgicas, CSIC, 28040, Madrid, Spain 2. Institute for Metals Superplasticity Problems, RAS, 450001, Ufa, Russia 3. Department of Mechanical & Astronautical Engineering, Naval Postgraduate School, 700 Dyer Road, Monterey, CA, 93943-5146, USA 4. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA 5. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK |
| Abstract: | The microstructure and microhardness of copper subjected to large strains either using one or a combination of severe plastic deformation (SPD) processing techniques was evaluated. The individual SPD techniques used include equal-channel angular pressing (ECAP), high-pressure torsion (HPT), and chip formation during machining (M). Microstructural characterization using orientation imaging microscopy provided detailed information on the grain sizes and misorientation statistics after different processing routes. Vickers indentation analysis was used to evaluate the hardness of the deformed samples. The results show that excellent microstructures and properties are achieved when these three processes are used in combination, including grain sizes in the range of ~0.2–0.3 μm and hardness values up to >1,900 MPa. |
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