HDDR processes in Nd{sub 16}Fe{sub 76{minus}x}Zr{sub x}B{sub 8} alloys and the production of anisotropic magnets

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.538871· OSTI ID:400764

Short, C L; Guegan, P; Gutfleisch, O; Ragg, O M; Harris, I R ^[1]

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1. Univ. of Birmingham (United Kingdom). School of Metallurgy and Materials

The HDDR-behavior of a series of as-cast alloys given by the general formula Nd{sub 16}Fe{sub 76{minus}x}B{sub 8}Zr{sub x} (0 {le} x {le} 2.0) has been characterized by hydrogen DTA and resistivity studies. It was found that increasing values of x increased the temperature of disproportionation. Microstructural studies of the Nd{sub 16}Fe{sub 75.5}Zr{sub 0.5}B{sub 8} alloy showed that a Zr-Fe containing phase present at the grain boundaries in the cast and disproportionated material is transformed during recombination into a Nd-Zr-Fe containing phase. This work shows that it is possible to produce highly anisotropic HDDR material from a non-homogenized Nd{sub 16}Fe{sub 75.5}Zr{sub 0.5}B{sub 8} cast alloy without any further additions such as Co or Ga. Under the conditions employed in these experiments it was found that the best properties were obtained for the Nd{sub 16}Fe{sub 75.5}B{sub 8}Zr{sub 0.5} alloy with a B{sub r} value in the easy direction of 1.03 T and an {sub i}H{sub c} of 775 kA/m. The high degree of anisotropy was confirmed by optical microscopy (polarized light).

• OSTI ID: 400764
• Report Number(s): CONF-960425--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
BORON ALLOYS
COBALT
EXPERIMENTAL DATA
FABRICATION
GADOLINIUM
IRON BASE ALLOYS
MAGNETIC PROPERTIES
MICROSTRUCTURE
NEODYMIUM ALLOYS
PERMANENT MAGNETS
ZIRCONIUM ADDITIONS