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Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering

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
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Item Type: Article
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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