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Harmonic-structured copper: performance and proof of fabrication concept based on severe plastic deformation of powders |
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| Authors: | Choncharoen Sawangrat Shota Kato Dmitry Orlov Kei Ameyama |
| Affiliation: | 1. Advanced Materials Laboratory, Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University, Biwako Kusatsu Campus, 1-1-1 Noji-Higashi, Kusatsu, Shiga, 525-8577, Japan 2. Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, Japan 3. Materials Research Laboratory, University of Nova Gorica, Vipavska cesta 13, 5000, Nova Gorica, Slovenia 4. Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga, Japan |
| Abstract: | Pure copper (Cu) having bimodal ‘harmonic structure’ (HS) was fabricated by a technique based on severe plastic deformation of powders, which involved tailored mechanical milling and spark plasma sintering. The harmonic-structured Cu demonstrates a unique combination of high strength and large elongation superior to its homogeneous as well as bimodal heterogeneous counterparts. Specific features of harmonic structure, i.e. continuous network of ultra-fine grained (UFG) regions encompassing coarse-grained areas, lead to the extension of uniform elongation. The optimum combination of properties in pure Cu is found to be in the harmonic-structured material having 40 % UFG fraction. |
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