Effect of Al and Cu Additions on Microstructure and Magnetic Properties of NdTb-FeCo-B Magnets

• Authors: G. Sadullahoğlu , B. Altuncevahir , O. Addemir
• Languages of publication: EN

Abstracts

EN

With the addition of Al and/or Cu into the NdFeB based magnet, the soft free iron phase was not observed in the cast alloys while it exists in the microstructure of the undoped NdFeB ingots. For the undoped sample, free iron disappeared after hot deformation process. Grain orientation is not good and there are deviations in the growth direction of the lamellar grains which are not perpendicular to the pressing direction. On the other hand, there is a striking change that the intergranular chemistry of Al added ingot separated into Nd-rich phase and a ternary FeNdAl composition most probably formed at the pressing temperature of 750°C. The highest remanent magnetization of 7.47 kG obtained for this sample, it might be due to the hard magnetic properties of this ternary composition. For the Al-Cu added sample, the high H_{c} and B_{r} values of 7.71 kOe and 7.33 kG, respectively, can be attributed to the homogeneous distribution of the intergranular composition and good orientation of the magnetic grains by hot deformation process.

Keywords

EN

75.50.Ww; 75.50.Vv; 75.50.Bb

Discipline

• 75.50.Vv: High coercivity materials
• 75.50.Bb: Fe and its alloys
• 75.50.Ww: Permanent magnets(for magnets, see 07.55.Db in instruments)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 5
• Pages: 1172-1175

Dates

published

2014-05

received

2013-01-22

(unknown)

2013-12-03

Contributors

author

G. Sadullahoğlu

• Bulent Ecevit University, Department of Metallurgical and Materials Engineering 67100 Incivez, Zonguldak, Turkey

author

B. Altuncevahir

• Istanbul Technical University, Department of Physics Engineering, 34469 Maslak, Istanbul, Turkey

author

O. Addemir

• Istanbul Technical University, Department of Metallurgical and Materials Engineering 34469 Maslak, Istanbul, Turkey

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Identifiers

DOI

10.12693/APhysPolA.125.1172