Title :
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
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 NdxFe93.5-xGa0.5B6 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; NdxFe93.5-xGa0.5B6; 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;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464260
