Dislocation structures in fatigued polycrystalline copper |
| |
| Affiliation: | 1. Department for Chemical Engineering, Münster University of Applied Sciences, Stegerwaldstraße 39, D-48565, Steinfurt, Germany;2. Institute for Physical Chemistry, University of Münster, Corrrensstraße 28/30, 48149, Münster, Germany;3. Xylem Water Solutions Herford GmbH, Boschstraße 4, 32051, Herford, Germany;4. GVB GmbH, Nordsternpark 2, D-52134, Herzogenrath, Germany;1. Institute of Strength Physics and Materials Science SB RAS, Tomsk 634055, Russia;2. National Research Tomsk Polytechnic University, Tomsk 634050, Russia;1. Energy Research Division, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 50-1 Sang-Ri, Hyeonpung-Myeon, Dalseong-gun, Daegu 711-873, Republic of Korea;2. Physics of Energy Harvesting Division, CSIR-National Physical Laboratory (NISE), Dr. K.S. Krishnan Marg, New Delhi 110 012, India;3. M.J.P. Rohilkhand University, Bareilly, Uttar Pradesh 243006, India;4. Centre for Nanoscience & Nanotechnology, Jamia Millia Islamia, New Delhi 110025, India;1. Department of Structural Engineering, University of Tabriz, P.O. Box 51666-16471, Tabriz, lIran;2. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK;3. Department of Materials and Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106, USA;4. School of Engineering, University of Aberdeen, King''s College, Aberdeen AB24 3UE, UK;5. Department of Materials, University of California, Santa Barbara, CA 93106-5050, USA;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Institute for Problems of Metals Superplasticity, Russian Academy of Sciences, Khalturina 39, Ufa 450001, Russia;3. Research Laboratory for Mechanics of New Nanomaterials, St. Petersburg State Polytechnical University, Polytechnicheskaya 29, St. Petersburg 195251, Russia;4. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12K. Marx Street, Ufa 450000, Russia;5. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;1. Applied Mechanics Lab., School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;2. Zernike Institute for Advanced Materials, Department of Applied Physics, University of Groningen, Nyenborgh 4, 9747 AG Groningen, The Netherlands |
| |
| Abstract: | The dislocation structures in fatigued polycrystalline copper with small average grain size were investigated over a plastic strain range from 1.5 x 10−5 to 10−2. It was found that the dislocation structures are arranged into three types of configurations, which correspond to the three regions in the cyclic stress-strain curve. Cylidirical loop patch structure are present in region A for low strain amplitudes, similar to those observed previously in coarse grained polycrystals. Moreover, irregular loop patches are also formed in this region for small grains polycrystals rather thanin region B at intermediate strain amplitudes for coarse grained polycrystals. In region B, persistent slip band (PSB) structures are formed but with a low volume content compared with the coarse grained polycrystals. In region C, at high plastic strains, the dislocation structures are dominated by dipolar walls. In addition, labyrinth structures are developed in region C instead of region B for coarse grained polycrystals. All the dislocation structures observed are viewed as forms of dipolized structures. A dipolized dislocation arrangement model is proposed to describe the formation process of dislocation structures. It is shown that all the dislocation configurations formed in cycled polycrystalline copper are low energy structures. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
