SpdTuM - SPD nanostructured magnets with tuneable properties


Project Leader:Andrea Bachmaier

Background


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.

News from the SpdTuM-Group

  • November 2019: The group performs XRD/SAXS/WAXS synchrotron measurements at the DESY in Hamburg (Germany).
  • November 2019: Andrea presents results of the project at the Annual Conference on Magnetism and Magnetic Materials 2019, in Las Vegas, USA.
  • October 2019: Manoel finishes his Bachelor thesis!
  • September 2019: Martin and Lukas give talks at the 6th International Symposium 'Bulk Nanomaterials' BNM 2019 in Ufa, Russia.
  • September 2019: Lukas, Stefan and Martin are participating in the 2019 European School on Magnetism with the special focus on experimental techniques.
  • September 2019: Andrea gives a talk about soft magnetic alloys processed by HPT at the EUROMAT 2019 in Stockholm, Sweden.
  • August 2019: Andrea, Stefan and Lukas are participating in the Joint European Magnetic Symposia (JEMS) 2019 in Uppsala, Sweden.
  • July 2019: Mirjam re-joins the group after her year studying abroad in Finland. Welcome back :)
  • June 2019: Andrea publishs a review paper in Materials Transactions. .
  • April 2019: Andrea is invited to join the 65th Metallkunde Symposium in Lech, Austria and gives an invited talk.
  • March 2019: Andrea and Lukas give two talks at the annual TMS meeting in San Antonio, USA.
  • March 2019: Stefan gives a talk at the ECI conference: Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities in Tomar, Portugal.
  • February 2019: Lukas and Martin are participating in the 2nd School on Atom Probe Tomography (APT) in Erlangen, Germany.
  • January 2019: Martin gives a talk at the 14th Joint MMM-Intermag Conference in Washington DC, USA.
  • January 2019: The group publish a paper in Nanomaterials.
  • December 2018: Georg Holub joins the group as new student assistant.
  • December 2018: The group performs XRD synchrotron measurements at the DESY in Hamburg (Germany).
  • November 2018: Andrea is invited to the TU Darmstadt and gives an invited talk at the MaWi-Kolloquium.
  • October 2018: Andrea is invited to join the 45th Retreat Symposium of the Department of Material Science and Engineering, FAU Erlangen, in Sattelbogen, Germany and gives an invited talk.
  • September 2018: Stefan publishes a paper together with Reinhard Pippan and Daniel Kiener in Materials & Design.
  • September 2018: The group shows up in full force for MSE in Darmstadt where Andrea also co-organized a symposium.
  • September 2018: Andrea publishes a paper with the group of Daniel Kiener in Materials & Design.
  • September 2018: Stefan and Martin present their results at the JEMS 2018 – The Joint European Magnetic Symposia in Mainz, Germany.
  • September 2018: Alexander Paulischin joins the group as new student assistant.
  • July 2018: Andrea gives an invited talk at the THERMEC 2018 in Paris, France.
  • July 2018: The group has to say good-bye to Mirjam, who spends a year studying in Finland.
  • June 2018: Mirjam finishes her Bachelor thesis!
  • June 2018: Andrea gives an invited talk at Joint Solid State Physics Seminar in Graz, Austria and presents part of the group's research.
  • May 2018: Lukas Weissitsch joins the group as a PhD candidate.
  • April 2108: Andrea give a talk at the 64th Metallkunde Colloquium at the Arlberg, Austria.
  • February 2018: The group presents first results at the ESI HPT Seminar in Leoben.
  • January 2018: Andrea presents the project to the General Assembly of the Austrian Academy of Sciences in Vienna, Austria.
  • January 2018: The SpdTuM group starts, Stefan Wurster and Mirjam Spuller join the group and Martin Stückler has his first day as PhD candidate in the project!

Publications

2019

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

2018

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