Effect of vanadium on oxygen diffusivity in niobium |
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| Institution: | 1. Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Helmholtzstr. 20, D-01069 Dresden, Germany;2. Institute of Materials Science, Dresden University of Technology, Helmholtzstr. 7, D-01069 Dresden, Germany;3. Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, D-01277 Dresden, Germany;4. Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Helmholtzstr. 20, D-01069 Dresden, Germany;5. Institute of Materials Science, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 5, D-09599 Freiberg, Germany;1. College of Science, Hunan Agricultural University, Changsha, 410128, China;2. College of Agriculture, Hunan Agricultural University, Changsha, 410128, China;3. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China;4. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China;1. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;2. General Motors Global R&D Center, 30500 Mound Road, Warren, MI 48092, USA;1. University of Campinas (UNICAMP), School of Mechanical Engineering, 13083-860, Campinas, SP, Brazil;2. Brazilian Nanotechnology National Laboratory (LNNano), Campinas, 13083-970, SP, Brazil |
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| Abstract: | The effect on the diffusivity of oxygen of vanadium additions to niobium was investigated by a diffusion couple technique. The addition of vanadium to niobium results in an increase of the activation energy for oxygen diffusion from 107 kJ mol−1 for oxygen in niobium to 176 ± 9 kJ mol−1 for the Nb-0.5at.%V alloy and to 194 ± 9 kJ mol−1 for the Nb-10at.%V alloy. This increase in the activation energy is attributed to the trapping of oxygen by vanadium atoms. Applying Kirchheim's trapping model and the results of internal friction measurements, trapping energies of about −64 and −49 kJ mol−1 were obtained for the Nb-0.5at.%V and the Nb-10at.%V alloys respectively. |
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