Title :
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
fDate :
9/1/1992 12:00:00 AM
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 δTc/Tc≈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 Hc =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; Nd10Fe75Mo15Nx; Nd10Fe75V15Nx; Nd10Fe82Ti8Nx; 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;
Journal_Title :
Magnetics, IEEE Transactions on
