Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

Cui, Bai; Li, W.F.; Hadjipanayis, G. C.

doi:10.1016/j.actamat.2010.09.060

Cited by 121 publications

(57 citation statements)

References 20 publications

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“…15 This is probably related to two aspects. As the flake thickness is reduced, more large-angle nanograin boundaries in the flakes will form, 14 which could weaken the strength of [001] out-of-plane texture of SmCo 5 flake and further influence on the anisotropy behavior of the flakes. On the other hand, as the flake size gets smaller the inter-particle friction increases, and the increased friction limits the particle rotation-orientation during alignment process.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

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

et al. 2016

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“…4(a)) like SmCo 5 flakes. 20 The highest maximum energy product is obtained for YCo 4.8 Fe 0.2 after vacuum annealed at 850…”

Section: -3mentioning

confidence: 95%

Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets

2016

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The structural and magnetic properties of ball-milled Fe-doped Y Co5−xFex(0 ≤ x ≤ 0.5) were investigated. The magnetization increases with Fe-doping up to the solid solubility limit, x = 0.3 without destroying the crystal structure or degrading the coercivity. A special magnet array is designed using ring magnets for pressing the powders under magnetic field in order to achieve magnetic alignment. A dramatic increase in magnetization is observed for magnetically aligned Y Co4.8Fe0.2 pressed ingots.

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“…The ball milling process has been widely used to decrease the particle size and/or increase the aspect-ratio of the magnetic materials with enhanced H c . [9][10][11] For MnAl-based materials under dry ball milling, it is hard to obtain very fine MnAl powders for which might stick on the surface of the milling jar or the balls. Therefore, liquidus surfactant are usually used in the ball milling of MnAl system.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and magnetic properties of MnAl powders prepared by elemental-doping and salt-assisted ball milling

Qian

Choi

et al. 2017

AIP Advances

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The effects of elemental doping of Si and Fe on the ε→τ phase transformation and the magnetic properties of MnAl were studied. The magnetic powders of Si- and Fe-doped MnAl were prepared by using induction melting followed by water-quenching, annealing, and salt-assisted ball-milling. The Fe-doped MnAl powders are mainly composed of the L10-structured τ-phase, while the Si-doped MnAl are composed of τ-phase and a small fraction of γ2- and β-phases. A unique thin leaves-like morphology with thickness of several tens of nanometers and diameter size up to 500 nm were observed in the Si-doped MnAl powders. The Fe-doped MnAl powders show irregular shape with much larger dimensions in the range from several to 10 μm. The morphology difference of the samples was ascribed to the variation of the mechanical properties affected by different doping elements. The phase transformation temperatures of the ε-phase of the samples were measured. The doping of Fe decreases the onset temperature of the massive phase transformation in MnAl, while the Si-doping increases the massive phase transformation temperature. Both Fe and Si increase the Curie temperature of MnAl. A substantially enhanced coercivity up to 0.45 T and 0.42 T were observed in the ball-milled MnAl powders doped with Si and Fe, respectively.

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Formation of SmCo5 single-crystal submicron flakes and textured polycrystalline nanoflakes

Cited by 121 publications

References 20 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

Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets

Phase transformation and magnetic properties of MnAl powders prepared by elemental-doping and salt-assisted ball milling

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