TU Darmstadt / ULB / TUprints

Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing

Maccari, Fernando ; Zintler, Alexander ; Brede, Thomas ; Radulov, Iliya A. ; Skokov, Konstantin P. ; Molina-Luna, Leopoldo ; Gutfleisch, Oliver (2023)
Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing.
In: Advanced Engineering Materials, 2023, 25 (18)
doi: 10.26083/tuprints-00024661
Article, Secondary publication, Publisher's Version

[img] Text
Copyright Information: CC BY-NC-ND 4.0 International - Creative Commons, Attribution NonCommercial, NoDerivs.

Download (5MB)
Item Type: Article
Type of entry: Secondary publication
Title: Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing
Language: English
Date: 7 November 2023
Place of Publication: Darmstadt
Year of primary publication: 2023
Place of primary publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: Advanced Engineering Materials
Volume of the journal: 25
Issue Number: 18
Collation: 8 Seiten
DOI: 10.26083/tuprints-00024661
Corresponding Links:
Origin: Secondary publication DeepGreen

The ferromagnetic Mn–Al–C τ‐phase (L1₀ tetragonal structure) shows intrinsic potential to be developed as a permanent magnet; however, this phase is metastable and is easily decomposed to nonmagnetic stable phases, affecting negatively the magnetic properties. Giving the necessity to careful control of its synthesis, the use of a novel approach is investigated using electric current–assisted annealing to obtain pure τ‐phase samples. The temperature and electrical resistance of the samples are monitored during annealing and it is shown that the change in resistance can be used to probe the phase transformation. Upon increase of electric current density, the required temperature for the ferromagnetic phase formation is reduced, reaching a maximum shift of 140 °C at 45 A mm⁻². Even though this noticeable shift is achieved, the magnetic properties are not affected showing coercivity of 0.13 T and magnetization of 90 Am² kg⁻¹, independently from the electric current density used during annealing. Microstructural investigation reveals the nucleation of the τ‐phase at the grain boundaries of the parent ε‐phase. In addition, the existence of twin boundaries upon nucleation and growth of the metastable phase for all evaluated annealing conditions is observed, resulting in similar extrinsic magnetic properties.

Uncontrolled Keywords: electric current–assisted annealing, metastable phase, Mn–Al–C permanent magnets, phase transformation
Identification Number: 2201805
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-246610
Additional Information:

Special Issue: Manipulation of Matter Controlled by Electric and Magnetic Field: Towards Novel Synthesis and Processing Routes of Inorganic Materials

Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 07 Nov 2023 12:49
Last Modified: 21 Nov 2023 09:06
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/24661
PPN: 513349766
Actions (login required)
View Item View Item