Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 491, Issue 1-2, Pages 694-697Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.11.047
Keywords
Quenched ribbons; Hot deformation; NdFeB magnets; Magnetic anisotropy
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The relation between the temperature for the initial powder densification and the structure and magnetic properties of anisotropic magnets, oriented by means of die-upset forging is reported. It was found that, from the viewpoint of the efficiency of the orientation process, there is an optimum temperature for the densification. For the Magnequench MQP-A powder used in the study, this temperature is about 650 degrees C. At this temperature the isotropic densified precursor has the most suitable structure, characterized by small grains and a density close to the theoretical value. The use of precursors with a favourable structure resulted in anisotropic magnets with the following properties: remanence J(r) = 1.41 T, coercivity (J)H(c) = 780 kA/m and maximum energy product (BH)(max) = 390 kJ/m(3). (C) 2009 Elsevier B.V. All rights reserved.
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