Effect of two-step annealing on magnetic properties of Pr-Fe-B base hot-rolled magnet

Author

Yuri, Tsukasa ; Ohki, Tsuguaki

Author_Institution

Kobe Steel Ltd., Hyogo, Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

2752

Lastpage

2754

Abstract

Magnetic properties of a Pr-Fe-B base magnet produced by the hot-rolling method are improved remarkably by a characteristic two-step annealing. The relationship between magnetic properties and microstructure in the two-step annealing is investigated for a Pr₁₅Fe_78.0B_5.5Cu_1.5 (at.%) hot rolled magnet, and the effect of Ga replacement for Cu is investigated for Pr ₁₅Fe_79.0B_5.5Ga_0.5 (at.%). The effect of the two-step annealing is attributed to recovery of disordered microstructure by first step annealing and development of network structure of Pr-rich phase by second-step annealing. The Ga replacement for Cu enhances the improvement of magnetic properties through formation of a more desirable microstructure by the two-step annealing

Keywords

annealing; boron alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; hot rolling; iron alloys; magnetisation; permanent magnets; praseodymium alloys; Pr-Fe-B base magnet; Pr₁₅Fe_78.0B_5.5Cu_1.5; Pr₁₅Fe_79.0B_5.5Ga_0.5; hot-rolled magnet; intrinsic coercive force; magnetic properties; microstructure; network structure; permanent magnets; residual magnetisation; two-step annealing; Annealing; Coercive force; Cooling; Demagnetization; Human computer interaction; Magnetic properties; Microstructure; Scanning electron microscopy; Steel; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280923

Filename

280923