Internal stress and defect-related free volume in submicrocrystalline Ni studied by neutron diffraction and difference dilatometry |
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| Authors: | J A Kotzurek M Hofmann S Simic P Pölt A Hohenwarter R Pippan |
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| Institution: | 1. Institute of Materials Physics, Graz University of Technology, Graz, Austria.;2. Research Neutron Source Heinz Maier-Leibnitz (FRM II), Technical University of Munich, Garching, Germany.;3. Graz Centre for Electron Microscopy, Graz, Austria.;4. Institute of Electron Microscopy and Nanoanalytics, Graz University of Technology, Graz, Austria.;5. Department of Materials Physics, University of Leoben, Leoben, Austria.;6. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria. |
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| Abstract: | A combined study of neutron diffraction and difference dilatometry on submicrocrystalline Ni prepared by high pressure torsion aims at studying the anisotropic behaviour during dilatometry and its relation to internal stress and structural anisotropy. Macroscopic stresses were undetectable in the dilatometer samples. Along with specific tests such as post cold-rolling, this shows that an observed anisotropic length change upon annealing is not caused by internal stress, but can be explained by the inherent microstructure, i.e. the anisotropic annealing of relaxed vacancies at grain boundaries of shape-anisotropic crystallites. |
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| Keywords: | Dilatometry neutron diffraction high-pressure torsion internal strain vacancy |
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