Papers by Author: M. Weller

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Authors: Martin Kilo, M. Weller, Günter Borchardt, B. Damson, S. Weber, S. Scherrer
Authors: Andreas Pichler, M. Weller, E. Arzt, J. Diehl
Authors: M. Weller, B. Damson, Michael Feuerbacher
Abstract: Mechanical loss (internal friction) measurements were applied to polycrystalline d- AlNiCo quasicrystals for compositions ranging from Al72.8Ni7.5Co19.7 to Al71.1Ni18Co10.9 and to an Al71.3Ni13.4Co15.3 mono-quasicrystal The measurements were carried out in the temperature range from 290 K up to 1220 K for measuring frequencies between 0.1Hz and 10 kHz. A loss maximum of Debye type is observed at ≈ 700 K (2Hz) for both the I-phase and the bCo-phase, which is attributed to local rearrangement of point defects. The activation enthalpy of the peak of H = 1.9 - 2.4 eV is in the range of values obtained from tracer diffusion experiments. This indicates that local defect rearrangement and self diffusion are governed by the same atomic diffusion process.. A high temperature viscoelastic damping background is only observed in polycrystalline samples with H = 2.4 – 3 eV. The background is assigned to viscolealastic relaxation based on intergranular diffusion.
Authors: M. Weller
Authors: W. Frank, M. Weller, J. Diehl, Alfred Seeger
Authors: Martin Kilo, M. Weller, Günter Borchardt
Authors: Radik R. Mulyukov, Hans Eckhardt Schaefer, M. Weller, D.A. Salimonenko
Authors: J. von der Hagen, M. Weller, E. Arzt
Authors: G. Haneczok, M. Weller, J. Diehl
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