Magnetic properties of isotropic Fe–28Cr–15Co–3.5Mo permanent magnets with additives

Ahmad, Zubair; Haq, Anwar Ul; Husain, Syed Wilayat; Abbas, Tahir

doi:10.1016/s0921-4526(02)00821-9

Cited by 19 publications

(5 citation statements)

References 4 publications

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“…It is thought that the expected hard magnetic properties of alloys can develop in this temperature range. It is also believed that the TMT field applied at 660-600 • C, when a spinodal decomposition is claimed to take place, causes precipitate orientation which provides a higher coercive force [4,5]. Sometimes the precipitates have the shape of a periodic microstructure which is oriented along the 1 0 0 crystallographic directions of a matrix but not along the direction of the magnetic field [3,5].…”

Section: Resultsmentioning

confidence: 99%

“…It is agreed that magnetic properties in the Fe-Cr-Co alloys can be improved by optimizing the heat treatment conditions [3] and by addition of small amount of elements such as Al, Mo, Ti, V, Nb, Si [4].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous experimental studies have shown that the ␣ 1 + ␣ 2 microstructure is formed during aging (or TMT) in the temperature range 600-660 • C. Further heat treatment at temperatures below 600 • C does not cause some changes in the microstructure of Fe-Cr-Co alloys, however, improves their hard magnetic properties [1][2][3][4][5]. The question arises: owing to which changes does this improvement take place?…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Morphology and heat treatment of a Fe60Cr30Co10 magnetic alloy

Ustinovshikov¹,

Пушкарев²,

Ульянов³

et al. 2005

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Morphology and heat treatment of a Fe60Cr30Co10 magnetic alloy

Ustinovshikov¹,

Пушкарев²,

Ульянов³

et al. 2005

Journal of Alloys and Compounds

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“…The deformation aging technique obtains the magnets in a thin sheet or wire shape. Deformation aging produced thin magnetic sheets, rods or wires which produces maximum magnetic properties as H c = 85.8 kA/m (1080 Oe), Br = 1.3 T (13 kG) and (BH) max = 79 kJ/m 3 (9.8 MGOe) in (42Fe–33Cr–23Co–2Cu) alloy [ 15 ], but these are expensive due to the involvement of a long processing cycle which put a restriction on their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Single α-Phase for Promoting Ferromagnetic Properties of 44Fe–28Cr–22Co–3Mo–1Ti–2V Permanent Magnet with Varying Co Concentration for Energy Storage

et al. 2022

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The thermal stability and structural, microstructural and magnetic properties of (40 + x) Fe–28Cr–(26 − x) Co–3Mo–1Ti–2V magnets with x = 0, 2, 4 addition in cobalt content were investigated and presented. The magnetic alloys were synthesized by vacuum arc melting and casting technique in a controlled argon atmosphere. Magnetic properties in the alloys were convinced by single-step isothermal field treatment and subsequent aging. The alloys were investigated for thermal stability, structural, microstructural and magnetic properties via differential thermal analysis (DTA), X-ray diffractometery (XRD), optical microscopy (OM), field emission scanning electron microscope (FESEM) and DC magnetometer. Metallurgical grains of size 300 ± 10 μm were produced in the specimens by casting and refined by subsequent thermal treatments. The magnetic properties of the alloys were achieved by refining the microstructure, the optimization of conventional thermomagnetic treatment to modified single-step isothermal field treatment and subsequent aging. The best magnetic properties achieved for the alloy 44Fe–28Cr–22Co–3Mo–0.9Ti–2V was coercivity Hc = 890 Oe (71 kA/m), Br = 8.43 kG (843 mT) and maximum energy product (BH)max = 3 MGOe (24 kJ/m3). The enhancement of remanence and coercivity enabled by the isothermal field treatment was due to the elongation of the ferromagnetic phase and step aging treatment due to the increase in the volume fraction. This work is interesting for spin-based electronics to be used for energy storage devices.

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“…One possibility is the minor addition of one or two ferromagnetic forming elements such as Al, Ti, V, Mo to the ternary Fe-Cr-Co alloys [4]. The other possibility is the optimization of processing conditions [5].…”

Section: Introductionmentioning

confidence: 99%

Grain size effect on magnetic properties of Fe–28Cr–15Co permanent magnets as a function of Mo content

Ahmed¹,

Haq²

2004

phys. stat. sol. (c)

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The Fe-28Cr-15Co-(1-4)Mo magnetic alloys were studied using X-ray diffraction, optical microscopy, transmission electron microscopy and magnetometery techniques. Permanent magnets were produced by employing thermo-magnetic aging process. The Fe-28Cr-15Co-3.5Mo alloys produced the optimum magnetic properties as coercive force = 840 Oe (66.83 kA/m), remanence = 11 kG (1.1 T), saturation magnetization = 12.5 kG (1.25 T) and energy product = 5.4 MGOe (43 kJ/m 3 ). Molybdenum content above 3.5 wt% produced cracking and brittleness in the alloys due to the formation of unwanted σ phase. The results indicates that molybdenum content from 1 to 3.5 wt% extends the ferromagnetic α grain structure at annealed state and affects the particle size, amount and shape anisotropy of the strongly magnetic α 1 phase that in turn improves the magnetic properties of the ternary Fe-28Cr-15Co alloys.

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Magnetic properties of isotropic Fe–28Cr–15Co–3.5Mo permanent magnets with additives

Cited by 19 publications

References 4 publications

Morphology and heat treatment of a Fe60Cr30Co10 magnetic alloy

Morphology and heat treatment of a Fe60Cr30Co10 magnetic alloy

Optimization of Single α-Phase for Promoting Ferromagnetic Properties of 44Fe–28Cr–22Co–3Mo–1Ti–2V Permanent Magnet with Varying Co Concentration for Energy Storage

Grain size effect on magnetic properties of Fe–28Cr–15Co permanent magnets as a function of Mo content

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