Microstructure and hard magnetic properties of directly synthesized L10(Fe1−xPtx)78Zr4B18 nanocrystalline alloys by melt spinning

2005 ◽  
Vol 97 (10) ◽  
pp. 10H307 ◽  
Author(s):  
T. Bitoh ◽  
A. Makino ◽  
M. Nakagawa
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Nanocrystalline Alloys ◽  
Hard Magnetic Properties

The hard magnetic properties of nanocomposite Nd3.6Pr5.4Fe83Co3B5 ribbons prepared by melt spinning

2001 ◽  
Vol 304-306 ◽  
pp. 997-1000 ◽  
Author(s):  
Hong-Wei Zhang ◽  
Wen-Yong Zhang ◽  
A-Ru Yan ◽  
Zhi-Gang Sun ◽  
Bao-Gen Shen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Hard Magnetic Properties

Preparation and Magnetic Properties of the Exchange Coupling NdFeB Nanocomposited Permanent Magnets

2007 ◽  
Author(s):  
Zongjun Tian ◽  
Shangdong Li ◽  
Youwei Du ◽  
Yinhui Huang
Keyword(s):  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Grain Boundaries ◽  
Exchange Coupling ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
Energy Product ◽  
Remanence Ratio ◽  
Optimum Energy ◽  
Hard Magnetic Properties

The effect of indium additions on the microstructures and magnetic properties of Nd9Fe85−xB6Inx (x = 0–2) nanocomposites prepared by melt spinning was investigated. It was found that a certain amount of indium added to Nd9Fe85B6 magnets enhances the hard magnetic properties. The coercivity and remanence ratio of the magnet with 0.5 at.% indium increases from 405kA/m (no indium) to 465kA/m and from 0.7 to 0.86 respectively. Squareness of its hysteresis loop is also improved greatly. The optimum energy product (BH)max increases remarkably from 95kJ/m3 to 145kJ/m3. The origin for those enhancements is mainly attributed to the magnetically softened grain boundaries and enhanced crystallographical coherency by indium addition. The magnetic annealing is found to be helpful to enhance the coherency and coupling between hard and soft phases.

Effect of Preparation on Glass Formation and Magnetic Properties of Nd-Fe-Co-Al-B Alloys

2000 ◽  
Vol 644 ◽  
Author(s):  
G. Kumar ◽  
J. Eckert ◽  
L.Q. Xing ◽  
A. Güth ◽  
S. Roth ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Hysteresis Loops ◽  
Liquid Region ◽  
Atomic Order ◽  
Copper Mold ◽  
Mechanically Alloyed ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Hard Magnetic Properties

AbstractThe effect of alternative preparation methods (copper mold casting, melt spinning, and mechanical attrition) on amorphization and properties of Nd57Fe20Co5Al10B8 and Nd40Fe40Co5Al8B7 alloys has been investigated. For all differently prepared samples an amorphous phase is formed upon solidification or solid sate reaction. However, the samples prepared by different processing routes exhibit different transformation behavior in thermal analysis. The cast Nd57Fe20Co5Al10B8 rod exhibits crystallization at 790 K followed by melting at 810 K. Neither appreciable endothermic reaction due to a glass transition nor a supercooled liquid region have been observed. Mechanically alloyed powders and ball-milled prealloys reveal two exothermic DSC peaks in the range of 650-850 K. The J-H hysteresis loops of samples synthesized by different routes show that the unique atomic order responsible for hard magnetic properties can only be accessed at moderate cooling rate of the melt as realized in copper mold casting. Rapidly quenched ribbons, mechanically alloyed powders and ball-milled ingots do not show hard magnetic properties at room temperature. These results indicate that amorphous samples with different local atomic order can be prepared by different processing routes.

Microstructure and hard magnetic properties of nanocomposite Sm2Fe15Ga2Cx permanent magnets with an excess of Fe prepared directly by melt spinning

1998 ◽  
Vol 72 (9) ◽  
pp. 1110-1112 ◽  
Author(s):  
Zhao-hua Cheng ◽  
Jun-xian Zhang ◽  
Hui-qun Guo ◽  
J. van Lier ◽  
H. Kronmüller ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
Hard Magnetic Properties

Improved thermal stability of hard magnetic properties in rapidly solidified RE–TM–B alloys

2008 ◽  
Vol 23 (10) ◽  
pp. 2733-2742 ◽  
Author(s):  
Z.W. Liu ◽  
R.V. Ramanujan ◽  
H.A. Davies
Keyword(s):  
Thermal Stability ◽  
Grain Size ◽  
Magnetic Properties ◽  
Elevated Temperature ◽  
Melt Spinning ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Rapidly Solidified ◽  
Hard Magnetic Properties

Rapidly solidified nanocrystalline RE–TM–B (RE = Nd, Pr, Dy, TM = Fe, Co) alloys with enhanced hard magnetic properties were synthesized by melt spinning. The composition- and microstructure-dependent elevated temperature magnetic properties were investigated. The temperature coefficients of remanence (α) and coercivity (β) were determined. The effects of Pr substituting Nd, Co substituting Fe, Dy substituting RE, and grain size on the Curie temperature and thermal stability were studied. Co or Dy substitutions were found to have a significant beneficial effect on the thermal stability. Reducing grain size could also improve elevated temperature behavior. Maximum energy product (BH)max > 100 kJ/m3 could be obtained in compositionally optimized nanophase alloys at temperature of 473 K. Extremely low coefficients of α and β were realized in exchange coupled nanocomposite alloys. Bonded nanocomposite magnets with α = −0.052%/K and β = −0.0365%/K for 300–400 K were also successfully fabricated.

scholarly journals Optimum Soft Magnetic Properties of the FeSiBNbCu Alloy Achieved by Heat Treatment and Tailoring B/Si Ratio

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1297
Author(s):  
Jonghee Han ◽  
Seoyeon Kwon ◽  
Sungwoo Sohn ◽  
Jan Schroers ◽  
Haein Choi-Yim
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Melt Spinning ◽  
Nanocrystalline Alloys ◽  
Soft Magnetic Properties ◽  
Vibrating Sample Magnetometer ◽  
Soft Magnetic ◽  
Different Temperatures ◽  
Annealing Heat Treatment ◽  
Si Content

To increase the saturation magnetization (Ms) of commercially available soft magnetic Finemet alloys to the level comparable to that of Si-steel and Fe-based nanocrystalline alloys such as Nanoperm, Nanomet, the B or Si content in combination with annealing heat treatment was tailored. The ribbons of Fe95−xSi1BxNb3Cu1 (x = 11, 12, 13) and Fe87−xSixB9Nb3Cu1 (x = 6, 8, 10) were prepared by melt-spinning and annealed at different temperatures to develop nanocrystalline microstructure optimizing the soft magnetic properties. The magnetic properties of the as-spun and annealed ribbons were measured using a vibrating sample magnetometer and AC B-H loop tracer to acquire Ms of above 1.4 T in all as-spun ribbons. Among the alloys, Fe84Si1B11Nb3Cu1 annealed at 545 °C showed the highest Ms of 2 T, which exceeds that of the conventional Finemet and other Fe-based nanocrystalline alloys.

scholarly journals Influence Of Cooling Rate On Phase Composition And Magnetic Properties Of Sm12.5Co66.5Fe8Cu11Si2 Alloy In The Form Of Ribbon In As-Quenched State

2015 ◽  
Vol 60 (2) ◽  
pp. 667-670
Author(s):  
M. Dośpiał ◽  
M. Nabiałek ◽  
K. Błoch
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Melt Spinning ◽  
Magnetic Measurements ◽  
Rapid Quenching ◽  
Vibrating Sample Magnetometer ◽  
Fabrication Method ◽  
Entire Volume ◽  
Diffraction Patterns ◽  
Hard Magnetic Properties

Abstract The fabrication method and magnetic properties of Sm12.5Co66.5Fe8Cu11Si2 alloy are presented in this article. The samples were produced by rapid quenching of the liquid alloy onto a rotating, copper wheel (the so-called ‘melt-spinning’ method) and they had a thin ribbon shape. The microstructure of the samples was investigated by measurements of diffraction patterns for powdered samples, in order to obtain data from the entire volume of the sample. It was found, that samples were composed of different amounts of Sm2Co17, SmCo5 and SmCo7 phases, depending on the linear velocity of the copper wheel used during the fabrication process. The magnetic measurements were performed using a vibrating sample magnetometer (LakeShore VSM) working with an external magnetic field of up to 2 T. It was found that the obtained ribbons displayed relatively good hard magnetic properties, such as remanence μ0MR, and high resistance to demagnetization fields JHC.

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