Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Functional Materials - Hydrogen
MM 14.8: Vortrag
Montag, 11. März 2013, 17:30–17:45, H26
Hydrogen Retention in Metals — •Katrin Peeper1, Marcus Moser1, Patrick Reichart1, Elena Markina2, Matej Mayer2, Zhijie Jiao3, and Gary Was3 — 1Universität der Bundeswehr, Angewandte Physik und Messtechnik, München, Germany — 2Max-Planck-Institute for Plasma Physics, EURATOM Association, Garching, Germany — 3Department of Engineering and Radiological Sciences, College of Engineering, University of Michigan, Ann Arbor, MI, USA
Degradation of wall materials used in fission and fusion reactors due to extreme conditions and radiation is investigated in order to develop improved materials. Hydrogen plays a key role in metal embrittlement and is trapped at various natural and ion induced defects. We present detailed study of the hydrogen retention in tungsten in 3 dimensions and its correlation with structural features e.g. grain boundaries and blisters performed by proton-proton-scattering.
We show that we obtain a sensitivity better than 10^15 at/cm^2 (2 at-ppm) in metals. We utilised 22 MeV protons to study hydrogen distributions in 50 um Stainless Steel and 25 um Tungsten samples. The steel samples have been irradiated with 2 MeV protons. The depth profiles show that less than 0.3% of the implanted hydrogen is retained and is localized mostly in the end of range peak. The Tungsten samples have been implanted using a Hydrogen ion beam with the energy of 200 eV/H. At these conditions, which mimic the conditions in future fusion reactors, blisters and cracks are created in the near-surface layer due to hydrogen-induced stress in the material.