High temperature thermal stability of pure copper and copper–carbon nanotube composites consolidated by High Pressure Torsion |
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| Affiliation: | 1. Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, Budapest H-1518, Hungary;2. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;3. Institute for Technical Physics and Materials Science, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary;1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. Taiyuan Iron and Steel (Group) Co., LTD., Taiyuan 030003, China;1. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Tsinghua–Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China |
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| Abstract: | The thermal stability of ultrafine-grained (UFG) microstructures in pure copper samples and copper–carbon nanotube (CNT) composites processed by High Pressure Torsion (HPT) was compared. The UFG microstructure in the sample consolidated from pure Cu powder exhibited better stability than that developed in a casted Cu specimen. The addition of CNTs to the Cu powder further increased the stability of the UFG microstructure in the consolidated Cu matrix by hindering recrystallization, however it also yielded a growing porosity and cracking during annealing. It was shown that the former effect was stronger than the latter one, therefore the addition of CNTs to Cu has an overall benefit to the hardness in the temperature range between 300 and 1000 K. A good agreement between the released heat measured during annealing and the calculated stored energy was found for all samples. |
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| Keywords: | A Metal–matrix composites (MMCs) A Nano-structures B High-temperature properties B Microstructures |
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