Project Leader: Andrea Bachmaier
The decrease of weight and the increase of efficiency of magnetic components are essential for the reduction of CO2-emission and an improvement of their performance. Nanostructuring can dramatically improve the magnetic properties of soft and hard magnetic materials, hence opening up entirely new possibilities for the development of novel magnets. Nanocomposite magnets, for example, have been the focus of research since two decades. One of the remaining key challenges is to synthesize bulk nanostructured magnets of a reasonable size. In this project, this challenge is explicitly addressed and the potential to fabricate bulk nanostructured magnets by severe plastic deformation (SPD) as an innovative processing route is evaluated. The aim of the project is not only to synthesize different nanostructured magnets by SPD, but also to tailor their microstructure to attain the desired magnetic properties. It has been shown by the applicant that the magnetic properties of SPD processed nanocrystalline materials can be modified in wide range by decomposition of metastable solid solutions. By using different immiscible systems, decomposition mechanisms and annealing treatments, unique nanostructures can be obtained and the magnetic properties can be optimized. Through the choice of different magnetic starting materials, such as soft, hard and antiferromagnetic-ferromagnetic powders, different types of hard magnetic nanocomposites will also be obtained. Fine tuning of the microstructure and resulting magnetic properties through adjustments in the composition, SPD processing parameters and annealing treatments is planned. The project systematically addresses the entire process from the synthesis to the in-depth microstructural characterization by electron microscopy and atom probe tomography. In combination with simultaneous measurements of magnetic properties, the newly developed knowledge will be used to improve the performance of SPD processed nanostructured magnet.
Name | Function | |
Stefan Wurster | Post-Doc | stefan.wurster(at)oeaw.ac.at |
Martin Stückler | Doctoral candidate | martin.stueckler(at)oeaw.ac.at |
Lukas Weissitsch | Doctoral candidate | lukas.weissitsch(at)oeaw.ac.at |
Michael Zawodzki | Doctoral candidate | michael.zawodzki(at)oeaw.ac.at |
Alexander Paulischin | Master thesis | alexander.paulischin(at)oeaw.ac.at |
Manoel Kasalo | Student assistant | manoel.kasalo(at)oeaw.ac.at |
Georg Holub | Student assistant | georg.holub(at)oeaw.ac.at |
G. Holub, Herstellung und Charakterisierung der magnetischen alpha-Phase in MnBi-Legierungen, Bachelor thesis, April 2020, Thesis
Martin Stückler, Lukas Weissitsch, Stefan Wurster, Peter Felfer, Heinz Krenn, Reinhard Pippan, Andrea Bachmaier, Magnetic dilution by severe plastic deformation, AIP Advances 10, 2020, 015210, DOI:10.1063/1.5128058
M. Kasalo, Microstructural evolution of Cu-Fe-Co and Ag-Fe-Co composites processed by high-pressure torsion, Bachelor thesis, September 2019, Thesis
Stefan Wurster, Lukas Weissitsch, Martin Stückler, Peter Knoll, Heinz Krenn, Reinhard Pippan, Andrea Bachmaier, Tuneable Magneto-Resistance by Severe Plastic Deformation, Metals Volume 9, Issue 11, 2019, 1188, DOI: 10.3390/met9111188
Katharina T. Schwarz, Julian M. Rosalie, Stefan Wurster, Reinhard Pippan, Anton Hohenwarter, Microstructure and Failure Characteristics of Nanostructured Molybdenum–Copper Composites, Advanced Engineering Materials, 2019, 1900474, DOI: 10.1002/adem.201900474
Stückler, M., Krenn, H., Pippan, R., Weissitsch, L., Wurster, S., Bachmaier, A., Magnetic binary supersaturated solid solutions processed by severe plastic deformation, Nanomaterials Volume 9, Issue 1, 2019, Article number 6, DOI: 10.3390/nano9010006
Bachmaier, A., Pippan, R., High-Pressure Torsion Deformation Induced Phase Transformations and Formations: New Material Combinations and Advanced Properties, Materials Transactions Volume 60, 1256-1269, DOI:10.2320/matertrans.MF201930
Pippan, R., Wurster, S., Kiener D., Fracture mechanics of micro samples: Fundamental considerations, Materials and Design Volume 159, 2018, 252-267, DOI: 10.1016/j.matdes.2018.09.004
Wurmshuber, M., Frazer, D., Bachmaier, A., Wang, Y., Hosemann, P., Kiener D., Impact of interfaces on the radiation response and underlying defect recovery mechanisms in nanostructured Cu-Fe-Ag, Materials and Design Volume 160, 2018, 1148-1157
DOI: 10.1016/j.matdes.2018.11.007
M. Spuller, Microstructural evolution of Cu-Fe-Co and Ag-Fe-Co composites processed by high-pressure torsion, Bachelor thesis, June 2018, Thesis
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 757333).
01.01.2018 – 31.12.2022