Microstructure of nanocomposite R-Fe-B die-upset magnets (R=Pr, Nd) produced from mechanically milled powders

Author

Zhang, Y. ; Gabay, A.M. ; Hadjipanayis, C.C.

Author_Institution

Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA

fYear

2005

fDate

4-8 April 2005

Firstpage

1653

Lastpage

1654

Abstract

The microstructure of nanocomposite R-Fe-B (R = Pr, Nd) die upset magnets is studied by TEM and HRTEM. The anisotropic magnets are produced by hot pressing, followed by a subsequent hot plastic deformation on the mechanically activated powders. For the Nd_xFe_93.5-xGa_0.5B₆ magnet, data show that the relative difference in the rare earth content results in dramatic difference in the grain size and texture corresponding to α-Fe phases of the magnet. The remanence, coercivity and maximum energy product are found to increase with x values from 15 to 15.5. The Pr₁₂Fe₈₀Cu₁Ga₁B₆ magnet containing Pr₂Fe₁₄B and bcc α-Fe phases is found to have elongated morphology with stronger texture.

Keywords

boron alloys; coercive force; copper alloys; crystal morphology; gallium alloys; grain size; hot pressing; iron alloys; magnetic transitions; magnets; nanocomposites; neodymium alloys; plastic deformation; praseodymium alloys; remanence; texture; HRTEM; Nd_xFe_93.5-xGa_0.5B₆; Pr₁₂Fe₈₀Cu₁Ga₁B₆; TEM; bcc α-Fe phase; coercivity; die-upset magnets; grain size; hot plastic deformation; hot pressing; magnetic phases; maximum energy product; microstructure; morphology; nanocomposite; remanence; texture; Anisotropic magnetoresistance; Grain size; Iron; Magnets; Microstructure; Neodymium; Plastics; Powders; Pressing; Remanence;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464260

Filename

1464260