Mechanism of Ti-rich grain boundary phase formation and coercivity reinforcement in Sm(Fe0.8Co0.2)11TiB  melt-spun ribbons

Liu, Zhenyuan; Liu, Zhuang; Wu, Haichen; Zhu, Chaoqun; Cheng, Wenxin; Cao, Shixun; Luo, Hubin; Lian, Wei; Chen, Renjie; Xia, Weixing; Feng, Hao; Yan, Aru

doi:10.1016/j.scriptamat.2023.115281

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Moreover, first-principles calculations reveal that the doping of V elements facilitates the paramagnetic formation of Fe 2 Ti at room temperature. The increase in coercivity in this work (4.82 kOe) is higher than that in similar work by Liu [16] S1. Magnetic properties of the Sm 8 Fe 73.5 Ti 8 V 8 Al 2 Ga 0.5 alloys with different cooling rates varying from 1.5 m/s to 8 m/s.…”

Section: Discussioncontrasting

confidence: 68%

“…As shown in Figure 8g, demagnetization domains form at lower external magnetic fields and nucleate rapidly between grains [43], with a coercive force of H c = 52.52 kOe in model 1. As shown in Figure 8h, due to the magnetic isolation effect provided by the presence of the Fe 2 Ti secondary phase between adjacent 1:12 phase grains [16], the coercivity of the magnet increases to 56.55 kOe in model 2. As shown in Figure 8i, although the Fe 2 Ti in the grain boundaries can hinder the propagation of demagnetization domains, Fe 2 Ti particles within the grains still cannot effectively prevent the magnetization reversal of the entire grain, so the coercivity of the magnet decreases to 55.29 kOe in model 3.…”

Section: Magnetic Simulationmentioning

confidence: 92%

“…A magnet with a composition of SmFeTiVGaAl exhibited relatively continuous weak magnetic grain boundary phases and a paramagnetic phase Fe 2 Ti [15], so the addition of Ga and al elements is conducive to the formation of grain boundary phases [9]. Liu et al introduced Ti-rich Fe 2 Ti grain boundary phases in Sm(Fe 0.8 Co 0.2 ) 11 TiB X alloys, which enhanced magnetic isolation between grains, resulting in an increase in coercivity from 3 kOe to 6 kOe and remanence from 61 emu/g to 75 emu/g; however [16], the introduction of Fe 2 Ti leads to the depletion of the rich Sm phase at the grain boundaries, which can affect the stability of the SmFe 12 phase during subsequent bulk magnet processing [17]. Currently, there are challenges in controlling the distribution of Fe 2 Ti to the grain boundaries without disrupting the Sm-rich grain boundary phase.…”

Section: Introductionmentioning

confidence: 99%

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Tuning Fe2Ti Distribution to Enhance Extrinsic Magnetic Properties of SmFe12-Based Magnets

Wei,

Xu,

et al. 2024

Crystals

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The ThMn12-type SmFe12-based rare-earth permanent magnet has attracted widespread attention due to its excellent intrinsic magnetic properties and high-temperature stability. However, the challenge in realizing continuous non-magnetic or weakly magnetic grain boundary phases equilibrated with the SmFe12 main phase hinders the enhancement in extrinsic magnetic properties of the SmFe12-based permanent magnet, especially for the coercivity. In this work, by controlling the cooling rate, the uniform distribution of paramagnetic Fe2Ti phases at grain boundaries is achieved in the SmFe12-based alloy ribbon, resulting in a high coercivity of 7.95 kOe. This improvement is attributed to the elimination of the impurity phase within the SmFe12 main phase and the magnetic isolation effect of the grain boundary phase composed of paramagnetic Fe2Ti, which is directly observed by transmission electron microscopy and further confirmed by micromagnetic simulation. Moreover, first-principles calculations show that the V element can dope into Fe2Ti and facilitate the transition of its paramagnetic state at room temperature. This study provides new insights into constructing weakly magnetic grain boundary phases for SmFe12-based permanent magnets, offering a novel approach to enhance coercivity.

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Section: Discussioncontrasting

confidence: 68%

Section: Magnetic Simulationmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Tuning Fe2Ti Distribution to Enhance Extrinsic Magnetic Properties of SmFe12-Based Magnets

Wei,

Xu,

et al. 2024

Crystals

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Enhancing coercivity through grain boundary phase modification in Sm Fe10V2

Zhou,

Song,

Zhang

et al. 2024

Journal of Materials Research and Technology

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Anisotropic SmFe10V2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process

Zhou,

Zhang,

Zheng

et al. 2024

Nanomaterials

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Anisotropic bulk magnets of ThMn12-type SmFe10V2 with a high coercivity (Hc) were successfully fabricated. Powders with varying particle sizes were prepared using the ball milling process, where the particle size was controlled with milling time. A decrease in Hc occurred in the heat-treated bulk pressed from large-sized powders, while heavy oxidation excessively occurred in small powders, leading to the decomposition of the SmFe10V2 (1–12) phase. The highest Hc of 8.9 kOe was achieved with powders ball-milled for 5 h due to the formation of the grain boundary phase. To improve the maximum energy product ((BH)max), which is only 2.15 MGOe in the isotropic bulk, anisotropic bulks were prepared using the same powders. The easy alignment direction, confirmed by XRD and EBSD measurements, was <002>. Significant enhancements were observed, with saturation magnetization (Ms) increasing from 59 to 79 emu/g and a remanence ratio (Mr/Ms) of 83.7%. (BH)max reaching 7.85 MGOe. For further improvement of magnetic properties, controlling oxidation is essential to form a uniform grain boundary phase and achieve perfect alignment with small grain size.

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Mechanism of Ti-rich grain boundary phase formation and coercivity reinforcement in Sm(Fe0.8Co0.2)11TiB melt-spun ribbons

Cited by 3 publications

References 17 publications

Tuning Fe2Ti Distribution to Enhance Extrinsic Magnetic Properties of SmFe12-Based Magnets

Tuning Fe2Ti Distribution to Enhance Extrinsic Magnetic Properties of SmFe12-Based Magnets

Enhancing coercivity through grain boundary phase modification in Sm Fe10V2

Anisotropic SmFe10V2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process

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