Nitrogenated 1:12 compounds prepared by mechanical alloying

Author

Gong, Wei ; Hadjipanayis, G.C.

Author_Institution

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

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2563

Lastpage

2565

Abstract

Nd(FeM)₁₂ compounds, with M=Mo, Ti, and V, prepared by mechanical alloying were nitrogenated using the gas phase interstitial modification process. The Nd(FeM)₁₂ structure has been found to be stable after nitrogenation at around 650°C, but with increased lattice parameters. The change in unit cell volume, δV/V, is larger in mechanically alloyed powders than in as-cast alloy powders. The change of Curie temperature upon nitrogenation is almost the same δT_c/T_c≈30%, for the three compounds studied. The mechanically alloyed powders and metal-bonded magnets with the ThMn₁₂ crystal structure show interesting hard magnetic properties with a coercivity H_c=7-10 kOe. The average grain size of the mechanically alloyed powders with the highest coercivity was shown about 4000 Å

Keywords

Curie temperature; X-ray diffraction examination of materials; coercive force; ferromagnetic properties of substances; grain size; iron alloys; lattice constants; mechanical alloying; molybdenum alloys; neodymium alloys; nitridation; permanent magnets; powder metallurgy; titanium alloys; transmission electron microscope examination of materials; vanadium alloys; Curie temperature; Nd₁₀Fe₇₅Mo₁₅N_x; Nd₁₀Fe₇₅V₁₅N_x; Nd₁₀Fe₈₂Ti₈N_x; TEM; X-ray diffraction; coercivity; crystal structure; gas phase interstitial modification; grain size; hard magnetic properties; lattice parameters; mechanical alloying; metal-bonded magnets; nitrogenation; powders; unit cell volume; Alloying; Anisotropic magnetoresistance; Coercive force; Heat treatment; Lattices; Milling; Nitrogen; Powders; Saturation magnetization; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179557

Filename

179557