Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 40: Topical Session Bulk Nanostrucured Materials IX - Functional Properties II

MM 40.4: Talk

Wednesday, March 28, 2012, 17:15–17:30, H 0106

Irradiation tolerance of bulk nanocrystalline alloys — •Askar Kilmametov¹, Kay Potzger², Christoph Gammer³, Mohammad Ghafari^1,4, Ruslan Valiev⁵, and Horst Hahn^1,4 — ¹Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Institute of Ion Beam Physics and Materials Research, Helmholz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³University of Vienna, Physics of nanostructured materials, Vienna, Austria — ⁴Institute for Materials Science, Joint Research Laboratory Nanomaterials, Darmstadt, Germany — ⁵Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, Russia

Radiation effects in nanostructured materials have attracted increasing interest in materials science. Bulk ordered nanocrystalline TiNi and FeAl alloys were processed using high pressure torsion. Fully-dense nanocrystalline and coarse-grained counterparts possessing a long-range ordering studied by X-ray diffraction and Mössbauer spectroscopy to examine irradiation effects on the stability or degradation of crystal superlattice. Comparative analysis of long-range disordering and amorphisation kinetics revealed essentially enhanced irradiation resistance of nanocrystalline intermetallic alloys. It was shown that at the equal damage dose nanocrystalline samples are able to retain a long-range ordering while the coarse-grained counterparts were substantially disordered or amorphised. The present experimental studies verify that fully-dense ordered intermetallic alloys are promising candidate materials for radiation environments.