Title :
Correlation between magnetic properties and microstructures of die-upset forged Fe-RE-B magnets and initial melt-spun ribbon
Author :
Leonowicz, M. ; Davies, H.A. ; Buckley, R.A.
Author_Institution :
Dept. of Eng. Mater., Sheffield Univ., UK
fDate :
11/1/1993 12:00:00 AM
Abstract :
The magnetic properties of hot pressed and die-upset forged Fe-RE-B magnets made from melt spun ribbons are studied in relation to the microstructure of the initial ribbon. It is found that the best properties are exhibited by magnets processed from optimally quenched nanocrystalline ribbons. The magnets processed from both underquenched and overquenched (amorphous) ribbons give inferior magnetic properties due to the presence of coarse grains resulting from a low quenching rate for the former and from a low crystal nucleation frequency in amorphous alloy during processing for the latter
Keywords :
boron alloys; crystal microstructure; crystallisation; ferromagnetic properties of substances; iron alloys; nanostructured materials; permanent magnets; quenching (thermal); rare earth alloys; amorphous alloy; coarse grains; crystal nucleation frequency; die-upset forged Fe-RE-B magnets; hot pressed magnets; initial melt-spun ribbon; magnetic properties; microstructures; optimally quenched nanocrystalline ribbons; overquenched ribbons; quenching rate; underquenched ribbons; Amorphous magnetic materials; Amorphous materials; Coercive force; Crystalline materials; Crystallization; Grain size; Magnetic materials; Magnetic properties; Magnets; Microstructure;
Journal_Title :
Magnetics, IEEE Transactions on
