Studies of Anisotropic MRE-Fe-B Magnets Fabricated by Hot Deformation in a Vacuum Hot Press (MRE=Nd+Y+Dy)

Our mixed rare-earth MRE2(Fe, Co)14B melt spun ribbons or gas atomized powders in nano-crystalline isotropic microstructures exhibited improved temperature stability at or above 120 degree C but a relatively lower maximum energy product (BH)max (12 MGOe) compared to about 25 MGOe for (micron-sized)...

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Bibliographic Details
Published in:AIP conference proceedings 2012-03
Main Authors: Tang, Wei, Dennis, Kevin, Oster, Nathaniel, Kramer, Matt, Anderson, Iver, McCallum, Ralph
Format: Article
Language:English
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Summary:Our mixed rare-earth MRE2(Fe, Co)14B melt spun ribbons or gas atomized powders in nano-crystalline isotropic microstructures exhibited improved temperature stability at or above 120 degree C but a relatively lower maximum energy product (BH)max (12 MGOe) compared to about 25 MGOe for (micron-sized) grain-aligned sintered MRE 2-14-1 magnets that were consolidated by traditional high temperature sintering. Unfortunately, these sintered MRE 2-14-1 magnets had a reduced temperature stability due to significant RE segregation within magnetic phase (2-14-1) grains. In this study, anisotropic magnets induced by grain texture were fabricated by a hot deformation method from over-quenched (substantially amorphous) isotropic MRE 2-14-1 ribbons. The new magnets obtained an improved (BH)max and achieved improved temperature stability. The relationships of magnetic properties and microstructure to compositions and processing parameters of the new sintered magnets were analyzed and discussed. In addition, the effect of extrinsic sintering additives, such as Zn and Al, on magnetic properties was investigated.
ISSN:0094-243X