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HREM and LORENTZ Microscopy Studies on Sm(Co,Cu,Fe,Zr)z High Temperature Permanent Magnets

Published online by Cambridge University Press:  02 July 2020

Y. Zhang ,
W. Tang ,
G.C. Hadjipanayis ,
C. Chen ,
J.F. Liu ,
C. Nelson ,
K. Krishnan ,
Z.P. Luo  and
D.J. Miller
Y. Zhang
Affiliation:
Department of Physics & Astronomy, University of Delaware, Newark, DE, 19716, USA
W. Tang
Affiliation:
Department of Physics & Astronomy, University of Delaware, Newark, DE, 19716, USA
G.C. Hadjipanayis
Affiliation:
Department of Physics & Astronomy, University of Delaware, Newark, DE, 19716, USA
C. Chen
Affiliation:
Electron Energy Corporation, Landisville, PA, 17538
J.F. Liu
Affiliation:
Electron Energy Corporation, Landisville, PA, 17538
C. Nelson
Affiliation:
NCEM, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
K. Krishnan
Affiliation:
NCEM, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
Z.P. Luo
Affiliation:
EMC, Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
D.J. Miller
Affiliation:
EMC, Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
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Abstract

Sm(Co,Cu,Fe,Zr)z 2:17 based permanent magnets have the highest Curie temperature and the most excellent temperature stability among the current rare-earth permanent magnets. in recent years, the Sm(Co,Cu,Fe,Zr)z magnets have attracted again considerable attention due to the demand of the Department of Defense for high temperature applications such as aircraft, spacecraft and ship systems. Our recent studies have led to the development of new precipitation hardened Sm(Co,Fe,Cu,Zr)z magnets with operating temperatures above 400°C and with coercivities as high as 10 kOe at 500°C. The microstructure of the Sm(Co,Cu,Fe,Zr)z high temperature magnets consists of a cellular structure (2:17 rhomobohedral cells surrounded by 1:5 hexagonal cell walls) superimposed on a lamella phase (2:17 hexagonal). This microstructure is sensitive to processing and to the alloy chemical composition. Magnetic domain structure studies play a critical role in understanding the magnetic hardening behavior of the magnets. in this paper, HREM and magnetic domain structure were studied in these Sm(Co,Cu,Fe,Zr) high temperature permanent magnets.

Type
Quantitative STEM: Imaging and EELS Analysis Honoring the Contributions of John Silcox (Organized by P. Batson, C. Chen and D. Muller)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 206 - 207
Copyright
Copyright © Microscopy Society of America 2001

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References

references

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