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Microstructure of the Die-Upset Nd (Pr)-Fe-B Hard Magnets Studied by Magnetic and High Resolution Transmission Microscopy

Published online by Cambridge University Press:  02 July 2020

V.V. Volkov ,
Y. Zhu ,
L.H. Lewis  and
D.O. Welch
V.V. Volkov
Affiliation:
Dept. of Applied Sciences, Brookhaven National Laboratory, Upton, NY, 11973
Y. Zhu
Affiliation:
Dept. of Applied Sciences, Brookhaven National Laboratory, Upton, NY, 11973
L.H. Lewis
Affiliation:
Dept. of Applied Sciences, Brookhaven National Laboratory, Upton, NY, 11973
D.O. Welch
Affiliation:
Dept. of Applied Sciences, Brookhaven National Laboratory, Upton, NY, 11973
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Extract

Magnetic properties of permanent magnets are sensitive to their microstructure. In particular, for a class of Nd(Pr)-Fe-B magnets very different coercivity and energy products may be obtained by different processing techniques. In this work we report on the preliminary results of magnetic domains (MD) structure and grain boundaries (GB) analysis of such hot-deformed Nd(Pr)-Fe-B magnets. To reveal the fine details of MD and GB interaction the experiments were carried out by the combined use of Magnetic Foucault-Fresnel Imaging and High Resolution Microscopy.

The magnets used in this study had a nominal composition Nd13.75Fe80.25B6 (I) and Pr13.75Fe80.25B6 (II) and were produced at the General Motors Research and Development Center. Buttons of the die-upset samples were prepared from overquenched ribbons using the melt-spun technique. Thin sections were cut from the buttons obtained by die-upset of the ribbons of I and II. These sections were mechanically polished and then ion milled until perforation. Electron microscopy was done using a JEM 2000FX microscope operating at 200 kV.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 540 - 541
Copyright
Copyright © Microscopy Society of America

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References

1 This research was supported by the U.S. Department of Energy, Division of Materials, Office of Basic Energy Science, under the Contract No. DE-AC02-76CH0016.Google Scholar