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Explosive shock processing of Pr2Fe14B/α–Fe exchange-coupled nanocomposite bulk magnets

Published online by Cambridge University Press:  01 March 2005

Z.Q. Jin,
N.N. Thadhani,
M. McGill,
Y. Ding,
Z.L. Wang,
M. Chen,
H. Zeng,
V.M. Chakka and
J.P. Liu
Z.Q. Jin
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332; and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
N.N. Thadhani*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
M. McGill
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Y. Ding
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
Z.L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
M. Chen
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, New York 10598; and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
H. Zeng
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, New York 10598; and Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
V.M. Chakka
Affiliation:
Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
J.P. Liu
Affiliation:
Department of Physics, University of Texas at Arlington, Arlington, Texas 76019
*
a)Address all correspondence to this author. e-mail: naresh.thadhani@mse.gatech.edu
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Abstract

Explosive shock compaction was used to consolidate powders obtained from melt-spun Pr2Fe14B/α–Fe nanocomposite ribbons, to produce fully dense cylindrical compacts of 17–41-mm diameter and 120-mm length. Characterization of the compacts revealed refinement of the nanocomposite structure, with approximately 15 nm uniformly sized grains. The compact produced at a shock pressure of approximately 1 GPa maintained a high coercivity, and its remanent magnetization and maximum energy product were measured to be 0.98 T and 142 kJ/m3, respectively. The compact produced at 4–7 GPa showed a decrease in magnetic properties while that made at 12 GPa showed a magnetic softening behavior. However, in both of these cases, a smooth hysteresis loop implying exchange coupling and a coercivity of 533 kA/m were fully recovered after heat treatment. The results illustrate that the explosive compaction followed by post-shock heat treatment can be used to fabricate exchange-coupled nanocomposite bulk magnets with optimized magnetic properties.

Keywords

DensificationNanoscaleShock loading

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 3 , March 2005, pp. 599 - 609
Copyright
Copyright © Materials Research Society 2005

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