Study of the effect of Zr-substitution on the HDDR characteristics of Nd-Fe-B-type alloys

Author

Kwon, Hae-Woong

Author_Institution

Dept. of Mater. Sci. & Eng., Pukyong Nat. Univ., Pusan, South Korea

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3826

Lastpage

3828

Abstract

Alloys with compositions based on Nd₁₆Fe_76-xB₈Zr_x (where x=0-2.0) have been studied to see the effect of Zr-substitution on the hydrogenation, disproportionation, desorption, recombination (HDDR) characteristic of the Nd-Fe-B-type alloys. The HDDR characteristics of the alloys were investigated by means of DTA, TPA and magnetic measurement. It has been found that a small substitution (0.1 at%) of Zr for Fe in the Nd-Fe-B-type alloy retards the disproportionation kinetics of the hydrogenated material. The desorption characteristic of the disproportionated materials has been found not to be affected significantly by the Zr-substitution. The Zr-substitution has been found to facilitate the recombination reaction. The peak coercivity of the HDDR treated material has been found to increase with increasing Zr-content. It has also been revealed that the Zr-substitution suppressed the degradation of the coercivity due to the excessive grain growth of the recombined grains on prolonged recombination

Keywords

boron alloys; coercive force; desorption; ferromagnetic materials; grain growth; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; thermal analysis; zirconium alloys; DTA; HDDR characteristics; Nd-Fe-B; Nd-Fe-B-type alloys; Nd₁₆Fe₇₄B₈Zr₂; Nd₁₆Fe₇₅B₈Zr; Nd₁₆Fe_76-xB₈Zr_x; Nd₁₆Fe₇₆B₈; TPA; Zr-content; Zr-substitution; coercivity; desorption characteristic; disproportionation kinetics; excessive grain growth; hydrogenated material; magnetic measurement; peak coercivity; prolonged recombination; recombination reaction; recombined grains; Absorption; Annealing; Hydrogen; Isothermal processes; Kinetic theory; Lead; Monitoring; Temperature; Zirconium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619584

Filename

619584