Nature and density of lattice defects in ball milled nanostructured copper |
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| Affiliation: | 1. Research Group Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria;2. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany;3. Department of Materials Science and Engineering, North Carolina State University, Engineering Building I, 911 Partners Way, Raleigh, NC 27695-7907, USA;1. Research Group Physics of Nanostructured Materials, University of Vienna;2. Georgia Institute of Technology, Atlanta, GA, USA;1. College of Chemistry, Instrumental Measurement and Analysis Center, Fuzhou University, Fuzhou 350002, People’s Republic of China;2. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore;1. Department of Physics, Fatih University, Buyukcekmece, 34500 Istanbul, Turkey;2. Faculty of Engineering and Natural Sciences, Suleyman Demirel University, 040900 Almaty, Kazakhstan;3. TUBITAK-BILGEM, Information Technologies Institute, 41470 Gebze-Kocaeli, Turkey;1. Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;2. Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;1. Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran;2. Mathematics Department, Khorasgan (Isfahan) Branch, Islamic Azad University, Isfahan, Iran |
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| Abstract: | Copper powder of 99.9% purity with particle size in the micrometer range was subjected to high energy ball milling by milling times between 2 and 24 h applying stearic acid as surfactant. The nature and density of lattice defects were determined using differential scanning calorimetry (DSC) and X-ray line profile analysis (XPA). The DSC measurements exhibit a considerable drop of the total stored energy with increasing ball milling time indicating a surprising decrease of lattice defect concentrations by more than one order of magnitude. The results from XPA, however, show that neither the dislocation density, nor the crystallite size can account for this behavior. Rather it is to be attributed to a high concentration of deformation induced vacancy type defects, with their density gradually decreasing during ongoing milling. |
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| Keywords: | Nanostructured Cu Deformation induced vacancies Ball milling Differential scanning calorimetry Activation enthalpy |
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