Jia, Yuxiao ; Wu, Yuye ; Xu, Yichen ; Zheng, Ruixiao ; Zhao, Shiteng ; Skokov, Konstantin P. ; Maccari, Fernando ; Aubert, Alex ; Gutfleisch, Oliver ; Wang, Jingmin ; Wang, Hui ; Zou, Jianxin ; Jiang, Chengbao (2023)
Roadmap towards optimal magnetic properties in L10-MnAl permanent magnets.
In: Acta Materialia, 245
doi: 10.1016/j.actamat.2022.118654
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Twin boundaries impact negatively the magnetic properties in conventionally-fabricated L10-type and RETM12-type permanent magnets. Herein, we propose a strategy to suppress twins’ formation by decreasing the grain and/or particle sizes below a critical size of Dt∼300 nm in L10-MnAl permanent magnets, thereby relieving twinning-inducing stress by shifting the balance between volume and surface energy. Twin-free monocrystalline nanoparticles smaller than Dt were used for preparing field-aligned polymer-bonded magnets with high texture. Generalizing our research findings, we propose here a roadmap for selecting the best route for manufacturing high-performance MnAl magnets, depending on their grain / particle size. The dependence of coercivity on grain/particle sizes shows that optimal coercivity can be reached within the range of 50–200 nm, which also shows a pathway to achieve the twin-free microstructure allowing the achievement of high texture degree in polymer-bounded or sintered magnets textured in a magnetic field. The results reported here can be applied to other twin-containing permanent magnet compounds, offering opportunities to drastically increase their texture and maximal energy products.

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