Recrystallization induced coercivity and magnetic properties enhancement in hot-deformed L1-Mn1.8Ga magnet

Lu, Qingmei; Wang, D.J.; Li, C.H.; Zhang, H.G.; Yue, Ming

doi:10.1016/j.jmmm.2018.11.005

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…These values represent approximately 97% of the ingot density. Since the typical density of Nd-Fe-B magnets produced by spark plasma sintering is 90-96% [29,30], the specimens consolidated at 773 K or higher had a sufficiently high density as magnets. Thus, the magnetic properties of the Mn-Ga magnets produced by consolidation at 773 K or higher were investigated.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, manganese-based magnets, such as Mn-Ga magnets with a D0 22 phase and Mn-Bi magnets with a low-temperature phase (LTP), have been the focus of attention as prospective replacements for rare-earth magnets [17][18][19][20][21][22][23][24][25][26]. It has been reported that the Mn-Ga alloys produced by melt spinning consist of a D0 22 phase and exhibited high coercivity [27][28][29][30][31][32][33]. The advantage of Mn-Ga alloys is their high magnetocrystalline energy.…”

Section: Introductionmentioning

confidence: 99%

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Production of Mn-Ga Magnets

Saito,

Tanaka,

Nishio-Hamane

2024

Materials

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Mn-based magnets are known to be a candidate for use as rare-earth-free magnets. In this study, Mn-Ga bulk magnets were successfully produced by hot pressing using the spark plasma sintering method on Mn-Ga powder prepared from rapidly solidified Mn-Ga melt-spun ribbons. When consolidated at 773 K and 873 K, the Mn-Ga bulk magnets had fine grains and exhibited high coercivity values. The origin of the high coercivity of the Mn-Ga bulk magnets was the existence of the D022 phase. The Mn-Ga bulk magnet consolidated at 873 K exhibited the highest coercivity of 6.40 kOe.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production of Mn-Ga Magnets

Saito,

Tanaka,

Nishio-Hamane

2024

Materials

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“…The coercivity map of τ-MnAl can be divided into four stages with the decreased grain/particle size. Stage 1: moderate improvement in coercivity derived from the increase in the density of grain boundaries which can pin the domain wall motion 23,28,52 .…”

Section: Stb-surface Area Of Twin Boundarymentioning

confidence: 99%

“…1a 12,[22][23][24][25][26][27][28][29][30][31][32][33][34][35] . This bottleneck is considered to be partly originated from the massive twin structures in the hard-magnetic phases, which can be observed in all these systems, as illustrated in Fig.…”

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confidence: 99%

Roadmap towards optimal magnetic properties in rare-earth-free L10-MnAl permanent magnets

Jia

et al. 2022

Preprint

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Twin defects deteriorate 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 Dt~300 nm, based on the stress relief mechanism resulting from the balance of volume/surface energy. Twin-free monocrystalline nanoparticles smaller than Dt were synthesized using a comprehensive spectrum of methods for preparing field-aligned polymer bonded magnet with high texture. We propose here a roadmap for selecting the best route for manufacturing high-performance rare-earth free 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, meanwhile, twin-free microstructure is realized which allows ultrahigh remanence by field induced texture. 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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Roadmap towards optimal magnetic properties in L10-MnAl permanent magnets

Jia

et al. 2023

Acta Materialia

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Recrystallization induced coercivity and magnetic properties enhancement in hot-deformed L1-Mn1.8Ga magnet

Cited by 8 publications

References 21 publications

Production of Mn-Ga Magnets

Production of Mn-Ga Magnets

Roadmap towards optimal magnetic properties in rare-earth-free L10-MnAl permanent magnets

Roadmap towards optimal magnetic properties in L10-MnAl permanent magnets

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