Atomic defects in metals and metals oxide

The project covers experimental studies of defects in metals and ceramics on an atomic scale. Structural as well as functional properties of materials are significantly determined by the presence and the behavior of atomic defects such as vacancies, dislocations, and grain or phase boundaries. For the characterization of such defects and the atomic processes they are involved in, two specific and complementary experimental approaches are used. From an atomistic point of view techniques are used that utilize the positron-electron annihilation in solids; from a more mesoscopic, continuum mechanics based experimental approach, high-resolution dilatometry is applied. The techniques for these two experimental approaches are also further continuously developed and applied and specifically tailored to novel classes of materials emerging in recent years such as metallic glasses, perovskite-based electro ceramics and advanced ionic conductors for application in batteries.

Persons involved: Wolfgang Sprengel, Roland Würschum, Laura Resch, Robert Enzinger

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Publications:

2020
Roland Würschum and Gregor Klinser Diffusion-drift-reaction model for positron trapping and annihilation at interfaces with space charge in bulk materials The Philosophical Magazine 100, 379-397, 2020 , DOI Show publication in PURE
Laura Resch, Thomas Gigl, Gregor Klinser, Christoph Hugenschmidt, Wolfgang Sprengel and Roland Würschum In situ monitoring of artificial aging and solution heat treatment of a commercial Al–Mg–Si alloy with a high intensity positron beam Journal of Physics / Condensed Matter 32, 2020 , DOI Show publication in PURE
Laura Resch, Martin Luckabauer, Nick Helthuis, Norihiko Okamoto, Tetsu Ichitsubo, Robert Josef Enzinger, Wolfgang Sprengel and Roland Würschum Search for vacancies in concentrated solid-solution alloys with fcc crystal structure Physical Review Materials 4, 2020 , DOI Show publication in PURE
2019
Robert Josef Enzinger, Elisabeth Hengge, Wolfgang Sprengel and Roland Würschum High-precision isothermal dilatometry as tool for quantitative analysis of precipitation kinetics: case study of dilute Al alloy Journal of Materials Science 54, 5083-5091, 2019 , DOI Show publication in PURE
2018
Laura Resch, Gregor Klinser, Elisabeth Hengge, Robert Josef Enzinger, Martin Luckabauer, Wolfgang Sprengel and Roland Würschum Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry Journal of Materials Science 53, 14657, 2018 , DOI Show publication in PURE
Roland Würschum, Laura Resch and Gregor Klinser Diffusion-reaction model for positron trapping and annihilation at spherical extended defects and in precipitate-matrix composites Physical Review / B 97, 224108-1 - 11, 2018 , DOI Show publication in PURE
Elisabeth Hengge, Robert Josef Enzinger, Martin Luckabauer, Wolfgang Sprengel and Roland Würschum Quantitative volumetric identification of precipitates in dilute alloys using high-precision isothermal dilatometry Philosophical Magazine / Letters 98, 301, 2018 , DOI Show publication in PURE
2017
Jaromir Kotzurek, Wolfgang Sprengel, Maciej Krystian, Sanja Simic, Peter Pölt, Anton Hohenwarter, Reinhard Pippan and Roland Würschum Structural anisotropy in equal-channel angular extruded nickel revealed by dilatometric study of excess volume International Journal of Materials Research 108, 81-88, 2017 Show publication in PURE
2016
Martin Luckabauer, Wolfgang Sprengel and Roland Würschum A high-stability non-contact dilatometer for low-amplitude temperature-modulated measurements Review of Scientific Instruments 87, 075116, 2016 Show publication in PURE
Gerrit Reglitz, Bernd Oberdorfer, Nina Fleischmann, Jaromir Kotzurek, Sergiy Divinski, Wolfgang Sprengel, Gerhard Wilde and Roland Würschum Combined volumetric energetic and microstructural defect analysis of ECAP-processed nickel Acta Materialia 103, 396-406, 2016 , DOI Show publication in PURE
2014
G. Ressel, Peter Parz, S. Primig, H. Clemens, Werner Puff and Harald Leitner New findings on the atomistic mechanisms active during mechanical milling of a Fe-Y_2O_3 model alloy Journal of Applied Physics 115, 2014 , DOI Show publication in PURE
Gerald Ressel, Peter Parz, Alexander Fian, David Holec, Sophie Primig, Werner Puff, Harald Leitner and Helmut Clemens On the bahavior of yttria/yttrium during mechanical alloying of a Fe-Y_2O_3 model alloy system Advanced Materials Research , 598-603, 2014 , DOI Show publication in PURE
2013
Helmut Mehrer and Wolfgang Sprengel Reaction diffusion and interdiffusion in some binary metallic systems Philosophical Magazine / Letters 93, 1971-1986, 2013 , DOI Show publication in PURE
Helmut Mehrer, Martin Luckabauer and Wolfgang Sprengel Self- and Solute Diffusion, Interdiffusion and Thermal Vacancies in the System Iron-Aluminium Defect and diffusion forum [Elektronische Resource] 333, 1-25, 2013 , DOI Show publication in PURE
Peter Parz, Bernd Fuchsbichler, Stefan Koller, Brigitte Bitschnau, Franz-Andreas Mautner, Werner Puff and Roland Würschum Charging-induced defect formation in LixCoO2 battery cathodes studied by positron annihilation spectroscopy Applied Physics Letters 102, 151901-1-151901-4, 2013 , DOI Show publication in PURE
2012
Peter Parz, M.J. Faller, R. Pippan, Werner Puff and Roland Würschum Defects in Al-3wt%Cu after high-pressure torsion studied by two-dimensional Doppler broadening spectroscopy Physics Procedia 35, 10-15, 2012 , DOI Show publication in PURE
Kiminori Sato and Wolfgang Sprengel Element-specific study of local segmental dynamics of polyethylene terephthalate upon physical aging The Journal of Chemical Physics 137, 104906/1-104906/7, 2012 , DOI Show publication in PURE
J.X. Fang, U. Vainio, Werner Puff, Roland Würschum, X.L. Wang, D. Wang, M. Ghafari, F. Jiang, J. Sun, H. Hahn and H. Gleiter Atomic Structure and Stuctural Stability of Sc_75Fe_25 Nanoglasses Nano Letters 12, 458-463, 2012 , DOI Show publication in PURE
Peter Parz, Michael, Josef Faller, Reinhard Pippan, Herbert Reingruber, Werner Puff and Roland Würschum Microstructure and vacancy-type defects of high-pressure torsion deformed Al-3wt%Cu alloy Journal of Applied Physics 112, 103506-1-103506-7, 2012 , DOI Show publication in PURE
2011
Andreas Jörg Schriefl, Sokratis Sgouridis, Werner Schustereder and Werner Puff Defect investigations via positron annihilation spectroscopy on proton implanted silicon Solid State Phenomena 178-179, 319-324, 2011 , DOI Show publication in PURE