Maccari, F. ; Aubert, A. ; Ener, S. ; Bruder, E. ; Radulov, I. ; Skokov, K. ; Gutfleisch, O. (2024)
Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering.
In: Journal of Materials Science, 2022, 57 (10)
doi: 10.26083/tuprints-00026607
Article, Secondary publication, Publisher's Version
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Item Type: | Article |
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Type of entry: | Secondary publication |
Title: | Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering |
Language: | English |
Date: | 10 September 2024 |
Place of Publication: | Darmstadt |
Year of primary publication: | 2022 |
Place of primary publication: | Dordrecht [u.a.] |
Publisher: | Springer Nature |
Journal or Publication Title: | Journal of Materials Science |
Volume of the journal: | 57 |
Issue Number: | 10 |
Collation: | 10 Seiten |
DOI: | 10.26083/tuprints-00026607 |
Corresponding Links: | |
Origin: | Secondary publication service |
Abstract: | Mn–Al–C is intended to be one of the ‘‘gap magnets’’ with magnetic performance in-between ferrites and Nd-Fe-B. These magnets are based on the metastable ferromagnetic τ-phase with L1₀ structure, which requires well controlled synthesis to prevent the formation of secondary phases, detrimental for magnetic properties. Here, we investigate the formation of τ-phase in Mn–Al–C using Spark Plasma Sintering (SPS) and compare with conventional annealing. The effect of SPS parameters (pressure and electric current) on the phase formation is also studied. Single τ-phase is obtained for annealing 5 min at 500°C with SPS. In addition, we show that the initial grain size of the τ-phase is influencing the τ-phase transformation and fraction at a given annealing condition, independently of the annealing method used. A faster transformation was observed for smaller initial ϵ-grains. The samples obtained by SPS showed comparable magnetic properties with the conventional annealed ones, reaching coercivity of 0.18 T and saturation magnetization of 114 Am ²/kg in the optimized samples. The similarity in coercivity is related to the microstructure, as we reveal the presence of structure defects like twin boundaries and dislocations in both materials. |
Status: | Publisher's Version |
URN: | urn:nbn:de:tuda-tuprints-266071 |
Additional Information: | This work was funded by the Deutsche Forschungsgemeinschaft DFG (German Research Foundation) under the Priority Programme SPP1959-Fields Matter and European Union’s Horizon 2020 research and innovation programme under grant agreement No 101003914 (PASSENGER). |
Classification DDC: | 500 Science and mathematics > 530 Physics 500 Science and mathematics > 540 Chemistry |
Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
Date Deposited: | 10 Sep 2024 07:45 |
Last Modified: | 10 Sep 2024 07:46 |
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/26607 |
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