Alnico permanent magnets an overview

Rao, A. Sambasiva

doi:10.1109/eeic.1993.631186

Cited by 14 publications

(10 citation statements)

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“…Consequently, the B2/ bcc phase boundaries in this spinodally decomposed microstructure do not act as effective pinning sites for the magnetic domains and the overall coercivity of the alloy is relatively low. The composition dependence of Hc in FeCoNi(AlSi) x and Al x CoCrFeNi HEAs, was also found to be irregular . The Ms and Hc of the CoCrFeCuNi HEA were estimated to be 53.41 emu g −1 and 166 Oe, respectively …”

Section: Resultsmentioning

confidence: 93%

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi

et al. 2017

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A combinatorial assessment of composition‐microstructure‐magnetic property relationships in magnetic high entropy AlCoxCr1‐xFeNi alloy (0 ≤ x ≤ 1) system has been carried out using compositionally graded alloys fabricated via laser additive manufacturing. At one end, the AlCoFeNi composition (x = 1) consisted of equiaxed B2 grains, exhibiting very early stages of phase separation (only compositional partitioning) into Ni–Al rich and Fe–Co rich regions within grains of the B2 phase. At the other extreme, the AlCrFeNi composition (x = 0) exhibited grains with pronounced spinodal decomposition, resulting in a B2 + bcc microstructure with the degree of spinodal decomposition progressively increasing with Cr content in these AlCoxCr1–xFeNi alloys. While the saturation magnetization (Ms) monotonically increases six times from x = 0 to x = 1, the coercivity (Hc) variation is non‐monotonic, increasing seven times from x = 0 to x = 0.4, and subsequently decreasing fourteen times from x = 0.4 to x = 1.0. The magnetic phase transition temperature (Tc) for these alloys also increases monotonically with increasing Co content with a second phase transition exhibited in a certain range of compositions between x = 0.6 to x = 0.8. Such substantial changes in the magnetization behavior and properties of magnetic high entropy systems opens possibilities of tuning these alloys for specific soft or hard magnetic component applications.

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Section: Resultsmentioning

confidence: 93%

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi

et al. 2017

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“…Thus, addition of Co also is important to enhancing permanent magnetic behavior 11 . The composition dependence of Hc in FeCoNi(AlSi)x and AlxCoCrFeNi HEAs was also irregular 14,24 . The Ms and Hc of the CoCrFeCuNi HEA were estimated to be 53.41 emu/g and 166 Oe, respectively 28 .…”

Section: Resultsmentioning

confidence: 98%

“…Additive manufacturing, depending on processing methodology, parameters, and build geometry, can yield far-from-equilibrium microstructures due to the rapid heating and cooling cycles of 10 2 -10 4 K/s [21][22][23][24] . This rapid cooling may freeze the microstructure such that variations in lattice parameters are significant as compared to the ideal.…”

Section: Introduction To Additive Manufacturingmentioning

confidence: 99%

Laser Additive Manufacturing of Magnetic Materials

Mikler

Chaudhary

Borkar

et al. 2017

JOM

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A matrix of variably processed Fe-30at%Ni was deposited with variations in laser travel speeds as well and laser powers. A complete shift in phase stability occurred as a function of varying laser travel speed. At slow travel speeds, the microstructure was dominated by a columnar fcc phase. Intermediate travel speeds yielded a mixed microstructure comprised of both the columnar fcc and a martensite-like bcc phase. At the fastest travel speed, the microstructure was dominated by the bcc phase. This shift in phase stability subsequently affected the magnetic properties, specifically saturation magnetization. Ni-Fe-Mo and Ni-Fe-V permalloys were deposited from an elemental blend of powders as well. Both systems exhibited featureless microstructures dominated by an fcc phase. Magnetic measurements yielded saturation magnetizations on par with conventionally processed permalloys, however coercivities were significantly larger; this difference is attributed to microstructural defects that occur during the additive manufacturing process. Finally, a compositionally graded AlCoxCr1-xFeNi (0.0

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“…In harsh environments SmCo magnets are often used, which can also go up to 300°C, still having a considerable cost regarding both the material and the process. The most used hard magnetic materials in sensor applications are definitely AlNiCo [6], [7] (even if the most expensive), especially for their low coercivity and high remanence (Fig. 1).…”

Section: A Overview On Bonded Magnets and Soft Magnetic Composites (mentioning

confidence: 99%

Hybrid magnetic composite (HMC) materials for sensor applications

Ferraris

Franchini

Pošković

2016

2016 IEEE Sensors Applications Symposium (SAS)

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Several applications adopt electromagnetic sensors, that base their principle on the presence of magnets realized with specific magnetic materials that show a rather high remanence, but low coercivity. This work concerns the production, analysis and characterization of hybrid composite materials, with the use of metal powders, which aim to reach those specific properties. In order to obtain the best coercivity and remanence characteristics various "recipes" have been used with different percentages of soft and hard magnetic materials, bonded together by a plastic binder. The goal was to find out the interdependence between the magnetic powder composition and the characteristics of the final material. Soft magnetic material (special Fe powder) has been used to obtain a low coercivity value, while hard materials were primarily used for maintaining a good induction remanence; by increasing the soft proportion a higher magnetic permeability has been also obtained. All the selected materials have been characterized and then tested; in order to verify the validity of the proposed materials two practical tests have been performed. Special magnets have been realized for a comparison with original ones (AlNiCo and ferrite) for two experimental cases: the first is consisting in an encoder realized through a toothed wheel, the second regards the special system used for the electric guitars.

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Alnico permanent magnets an overview

Cited by 14 publications

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A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi

Laser Additive Manufacturing of Magnetic Materials

Hybrid magnetic composite (HMC) materials for sensor applications

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Alnico permanent magnets an overview

Cited by 14 publications

References 0 publications

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCoxCr1–xFeNi

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCoxCr1–xFeNi

Laser Additive Manufacturing of Magnetic Materials

Hybrid magnetic composite (HMC) materials for sensor applications

Contact Info

Product

Resources

About

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi

A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo_xCr_1–xFeNi