Deformation-induced texture in nanocrystalline 2:17, 1:5 and 2:7 Sm–Co magnets

Gabay, A. M.; Marinescu, M.; Liu, J.F.; Hadjipanayis, G. C.

doi:10.1016/j.jmmm.2009.06.011

Cited by 42 publications

(16 citation statements)

References 22 publications

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“…To achieve magnetic anisotropy in nanocrystalline magnets, research had focused on hot-deformation consolidation methods. 6,7 In such approach however, the coercivity is destroyed due to grain growth during high temperature processing. In order to develop high performance permanent magnet both high magnetization and high coercivity are required.…”

Section: Introductionmentioning

confidence: 99%

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

et al. 2016

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In this study, nanocrystalline SmCo5 bulk magnets were prepared by hot-pressing of nanoflake powders fabricated via surfactant-assisted high energy ball milling. Effect of the flake thickness on magnetic coercivity of the SmCo5 bulk was investigated. Anisotropic SmCo5 nanoflakes with thickness between 100 and 1000 nm were prepared by varying the milling parameter of ball-to-powder weight ratio. XRD analysis revealed that as-milled flake powders possessed nanocrystalline grains with no observable oxide peaks. The coercivity of the flake powders varied between 19.9 and 21.3 kOe for 1000 nm to 100 nm thick flakes, which indicated that the flake thickness in this range had no obvious effect on the coercivity of the powders. However, the coercivity of the bulks showed a strong dependence on the flake thickness. The bulk coercivity value of 10.97 kOe corresponding to the flake thickness of 100 nm, was 80% higher compared to the bulk prepared with the flakes of 1000 nm. XRD results on compacted samples did not show any grain growth, however, Sm2O3 and free Co were detected in SmCo5 bulks and their content increased with reduced flake thickness. Interestingly enough the bulk coercivity was not deteriorated with the presence of Sm oxide and Co.

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Section: Introductionmentioning

confidence: 99%

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

et al. 2016

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“…For a texture analysis, the powder XRD spectra were compared to those taken from the hot-deformed magnets at 0.75 of their height [5]. Specimens for transmission electron microscopy (TEM; JEOL 3010 instrument) were prepared parallel to the press direction.…”

Section: Methodsmentioning

confidence: 99%

“…Specimens for transmission electron microscopy (TEM; JEOL 3010 instrument) were prepared parallel to the press direction. Room-temperature magnetic properties were measured on rectangular parallelepiped specimens cut parallel or perpendicularly to the press direction [5] with a vibrating sample magnetometer (Quantum Design VersaLab instrument) after magnetizing by a pulsed field of 100 kOe. All the magnetization curves were corrected for the self-demagnetizing field.…”

Section: Methodsmentioning

confidence: 99%

“…Still, the texture induced even in the PrCo 5 -based alloys is not perfect; previous studies on the meltspun [2,3] and high-energy ball-milled [4] materials reported the highest values of the maximum energy product (BH) max of [17][18][19] MGOe, which are much lower than one could expect for the perfectly textured magnets. The other R-Co hard magnetic compound, rhombohedral Sm 2 Co 17 , showed no deformationinduced texture, at least when upset by up to 70% [5]. Recently, Yue et al [6] reported that a significantly improved texture can be obtained in the nanocrystalline SmCo 5 alloys subjected to dieupsetting at a very high degree of deformation (more than 85% height reduction).…”

Section: Introductionmentioning

confidence: 99%

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Effect of hot deformation on texture and magnetic properties of Sm–Co and Pr–Co alloys

Gabay

Hadjipanayis

2011

Journal of Magnetism and Magnetic Materials

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“…Techniques including unidirectional solidification, deformation-induced texture, magnetic field-assisted ball-milling, and meltspinning at low wheel speeds have induced texture in SmCo alloys either with low degree of texture or with a moderate degree of texture resulting in a non-unidirectional easy axis [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Study on the Magnetic Characteristics of Anisotropic SmCo₇-type Alloys Synthesized by High-energy Surfactant-assisted Ball Milling

Yu¹,

Zhang²,

Shi³

et al. 2014

Journal of Magnetics

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An effective process was employed for synthesizing anisotropic magnetic SmCo 7 -type alloy flakes with high coercivity, which is highly desirable for many applications. The highest coercivity of 16.3 kOe corresponds to a typical flake thickness of 200 nm for the 3-h ball-milled sample. The anisotropy field was calculated by measuring the parallel and perpendicular directions to the easy magnetization direction of the powders. The anisotropy field decreased with the increase of the ball milling time, thus indicating that the decrease of coercivity was mainly caused by the reduction of the anisotropy field. Microstructure analysis indicated that the morphology, grain size, and anisotropy field of these samples have a great influence on the magnetic properties.

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Deformation-induced texture in nanocrystalline 2:17, 1:5 and 2:7 Sm–Co magnets

Cited by 42 publications

References 22 publications

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

Effect of hot deformation on texture and magnetic properties of Sm–Co and Pr–Co alloys

Study on the Magnetic Characteristics of Anisotropic SmCo₇-type Alloys Synthesized by High-energy Surfactant-assisted Ball Milling

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Deformation-induced texture in nanocrystalline 2:17, 1:5 and 2:7 Sm–Co magnets

Cited by 42 publications

References 22 publications

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

Effect of flake thickness on coercivity of nanocrystalline SmCo5 bulk prepared from anisotropic nanoflake powder

Effect of hot deformation on texture and magnetic properties of Sm–Co and Pr–Co alloys

Study on the Magnetic Characteristics of Anisotropic SmCo7-type Alloys Synthesized by High-energy Surfactant-assisted Ball Milling

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Study on the Magnetic Characteristics of Anisotropic SmCo₇-type Alloys Synthesized by High-energy Surfactant-assisted Ball Milling