Improvements of the magnetic properties of equiaxed Fe-Cr-Co-Mo hard magnets by two-step thermomagnetic treatment

Sugimoto, Satoshi; Honda, J.; Ohtani, Y.; Okada, Masuo; Homma, M.

doi:10.1109/tmag.1987.1065254

Cited by 27 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These two kinds of alloys undergo spinodal decomposition to form two phases structure, one is ferromagnetic and the other is paramagnetic [1][2][3][4][5]. External magnetic field is usually employed during isothermal treatment to elongate the ferromagnetic a 1 phase, and thus impart magnetic anisotropy to these kinds of alloys [6][7][8]. Generally, increasing external magnetic field intensity is expected to improve the alignment of ferromagnetic a 1 phase and increase the aspect ratio of ferromagnetic a 1 phase, which are corresponding to better magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Spinodal decomposition in Fe–25Cr–12Co–1Si alloy under a 100kOe magnetic field

Sun

et al. 2006

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Spinodal decomposition in Fe–25Cr–12Co–1Si alloy under a 100kOe magnetic field

Sun

et al. 2006

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

“…The appropriate α 1 particle size will result in a high H c value. With increasing TMT time duration causes the particles coarsen and H c decreases [15]. Table 1 gives relation between the magnetic properties and TMT temperature along with cooling rate for our samples.…”

Section: Magnetic Properties Analysismentioning

confidence: 99%

Development of Fe-Cr-Co Permanent Magnets by Single Step Thermo-Magnetic Treatment

Akbar

Ahmad

Awan

et al. 2012

KEM

View full text Add to dashboard Cite

The present work is focused on a new approach for the development of Fe-Cr-Co based permanent magnets. Fe-Cr-Co alloy was prepared by using tri arc melting technique under inert atmosphere of Argon. Solution treatment was done at a temperature of 1250°C for five hours followed by water quenching and then a single step thermo-magnetic treatment (TMT) was applied at predetermined cooling rates. The influence of TMT and cooling rates on the final magnetic properties of the alloy were investigated. The results reveal that microstructure and magnetic properties were sensitive to both cooling rates & TMT and can be optimized by controlling the processing conditions. The optimum magnetic properties in the alloy with two different cooling rates of 1°C per minute and 2°C per minute were obtained as (i) 1010 Oe (Hc), 9400 G (Br), 3.4 MGOe (BHmax) (ii) 810 Oe (Hc), 10590 G (Br), 3.6 MGOe (BHmax) respectively. The above method provides a quick and low cost manufacturing route for the Fe-Cr-Co based permanent magnets with comparable magnetic properties to that of Alnico with added advantage of having high ductility.

show abstract

“…This is likely due to the reduced amount of ferromagnetic elements and addition of antiferromagnetic Mn. As other multiphase metallic alloys are improved by thermomagnetic treatments [28,29], a single sample was annealed for 1 hour at 500 °C in a 3 T magnetic field. There was no significant difference in coercivity or remanence compared to the sample annealed at the same temperature and time without a field.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Structure and magnetic properties of a multi-principal element Ni–Fe–Cr–Co–Zn–Mn alloy

et al. 2016

View full text Add to dashboard Cite

A nanocrystalline alloy with a nominal composition of Ni 20 Fe 20 Cr 20 Co 20 Zn 15 Mn 5 was produced by mechanical alloying and processed using annealing treatments between 450-600 °C for lengths from 0.5-4 hours. Analysis was conducted using x-ray diffraction, transmission electron microscopy, magnetometry, and first-principles calculations. Despite designing the alloy using empirical high-entropy alloy guidelines, it was found to precipitate numerous phases after annealing. These precipitates included a magnetic phase, α-FeCo, which, after the optimal heat treatment conditions of 1 hour at 500 °C, resulted in an alloy with reasonably good hard magnetic properties. The effect of annealing temperature and time on the microstructure and magnetic properties are discussed, as well as the likely mechanisms that cause the microstructure development.

show abstract

Improvements of the magnetic properties of equiaxed Fe-Cr-Co-Mo hard magnets by two-step thermomagnetic treatment

Cited by 27 publications

References 12 publications

Spinodal decomposition in Fe–25Cr–12Co–1Si alloy under a 100kOe magnetic field

Spinodal decomposition in Fe–25Cr–12Co–1Si alloy under a 100kOe magnetic field

Development of Fe-Cr-Co Permanent Magnets by Single Step Thermo-Magnetic Treatment

Structure and magnetic properties of a multi-principal element Ni–Fe–Cr–Co–Zn–Mn alloy

Contact Info

Product

Resources

About