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MnAlC powders used for the milling and hot-pressing experiments were synthesized and provided by Hoganas AB in the frame of the industrial project ECNanoManga (Hoganas AB -IMDEA Nanociencia). The authors acknowledge financial support from the Spanish Ministerio de Economia, Industria y Competitividad (MINECO) through 3D-MAGNETOH project (Ref. MAT2017-89960-R) and the "Acciones de Dinamizacion 'Europa Investigacion'" projects (Ref. EUIN2017-88502 and Ref. EIN2019-103506); and from the Regional Government of Madrid through NANOMAGCOST project (Ref. 2018/NMT-4321). IMDEA Nanociencia acknowledges support from the 'Severo Ochoa' Programme for Centers of Excellence in R&D (MINECO, Grant SEV-2016-0686).

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Fabrication of bulk tau MnAl-C magnets by hot-pressing from epsilon-phase gas-atomized and milled powder

Publicado en:JOURNAL OF ALLOYS AND COMPOUNDS. 847 - 2020-12-20 847(), DOI: 10.1016/j.jallcom.2020.156361

Autores: Munoz-Rodriguez, C.; Feng, L.; Palmero, E. M.; Mix, T.; Rial, J.; Olsson, F.; Skarman, B.; Vidarsson, H.; Larsson, P-O; Woodcock, T. G.; Bollero, A.;

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Isotropic nanocrystalline MnAlC particles with quasi-spherical shape were synthesized by gasatomization being afterwards milled for a short time of 60 s. Gas-atomized and milled particles were compacted by the hot-pressing method to obtain bulk MnAlC magnets. An adequate combination of the parameters during hot-pressing made it possible to fabricate bulk MnAlC magnets with a simultaneous transformation of epsilon-phase into the ferromagnetic tau-phase. The study has allowed for correlating the morphology, microstructure and magnetic properties of the bulk magnets obtained from the different powder samples. Hot-pressing experiments performed on milled epsilon-phase based powders resulted in an increased coercivity as a consequence of a reduced crystallite size (about 25 nm), induced strain (about 0.40%) and the formation of both beta-Mn phase and Mn3AlC. This single-step approach has been compared with a two-step process comprising annealing of the gas-atomized epsilon-phase to develop the tau-phase as a first step followed by compaction via hot-pressing in a second step. Comparable magnetic properties obtained for the bulk magnets resulting from this two-steps route validates the single-step approach followed in this study. This work shows that gas-atomization, flash-milling and hot-pressing of epsilon-phase MnAlC powder is an efficient path towards the fabrication of bulk tau-MnAlC magnets. (C) 2020 Elsevier B.V. All rights reserved.

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