New microcrystalline hard magnets in a Co-Zr-B alloy system

Author

Ghemawat, A. Mitra ; Foldeaki, M. ; Dunlap, R.A. ; O´Hadley, R.C.

Author_Institution

Dept. of Mat. Sci. & Eng., MIT, Cambridge, MA, USA

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3312

Lastpage

3314

Abstract

The glass formability and magnetic properties of rapidly solidified Co-Zr-B alloys were investigated in the composition range Co ₈₀Zr_xB_20-x (2⩽x⩽18 a/o) in order to determine the glass-forming range and explore the magnetic characteristics as a function of composition and quenching rate. The alloys were found to be completely glassy for 6⩽x⩽10, whereas all the other compositions studied were completely or partially crystalline. The typical glassy alloys showed good soft magnetic properties. The crystalline alloys with Zr content of 16 and 18 a/o were characterized by coercive force in excess of 3 kOe. Slowly-cooled samples of the same composition showed coercivity on the order of 100 Oe

Keywords

boron alloys; cobalt alloys; coercive force; ferromagnetic properties of substances; magnetic properties of amorphous substances; metallic glasses; splat cooling; zirconium alloys; Co-Zr-B alloy; Zr content; coercive force; coercivity; composition range; crystalline alloys; function of composition; glass formability; glass-forming range; glassy alloys; magnetic characteristics; microcrystalline hard magnets; quenching rate; soft magnetic properties; Amorphous magnetic materials; Cooling; Crystallization; Glass; Magnetic properties; Magnetostriction; Magnets; Materials science and technology; X-ray diffraction; Zirconium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42288

Filename

42288