Bulk nanocomposite magnets produced by dynamic shock compaction
Author(s)
Chen, K. H.
Jin, Z. Q.
Kennedy, G.
Wang, Z. L. (Zhong Lin)
Zeng, Hao
Cheng, S.-F.
Liu, J. Ping
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Abstract
Exchange-coupled R₂Fe₁₄B/α -Fe (R = Nd or Pr) nanocomposite bulk magnets with nearly full density have been successfully produced by shock compaction of melt-spun powders. X-ray diffraction and transmission electronic microscopy analyses of the shock-consolidated compacts showed no grain growth upon compaction, in fact, a decrease in the crystallite size of both the hard and soft phases was observed. As a consequence, magnetic properties were retained and even improved after compaction. Hysteresis loops of the shock-consolidated powder compacts showed a smooth single-phaselike behavior, indicating effective exchange coupling between hard and soft magnetic phases.
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Date
2004-07-15
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