Title :
Changes in magnetostriction of polycrystalline Tb-Dy-Fe casting alloys after annealing
Author :
Ono, Hideaki ; Shimada, Munekatsu ; Toma, Hideo
Author_Institution :
Mater. Res. Lab., Nissan Motor Co. Ltd., Yokosuka, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
A study investigated the changes that occur in the structure and magnetostrictive properties of polycrystalline Tb-Dy-Fe casting alloys after annealing. The alloys formed a columnar structure along the thermal flow direction during casting, and the Laves phases tended to show a (110) orientation parallel to the columnar structure. The magnetostriction of the alloys under a condition of compressive prestress changed substantially as a result of annealing, and a pronounced increase in magnetostriction was observed at annealing temperatures above 750°C. After annealing, magnetostrictive properties reflected changes in magnetocrystalline anisotropy and the saturation magnetostrictive coefficient due to differences in the Tb/Dy ratio. Annealing had the effect of homogenizing the alloys and easing lattice distortion of the Laves phases
Keywords :
annealing; casting; dysprosium alloys; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetostriction; terbium alloys; 750 C; Laves phase; Tb-Dy-Fe; annealing; columnar structure; magnetocrystalline anisotropy; magnetostriction; polycrystalline casting alloy; prestress dependence; Anisotropic magnetoresistance; Annealing; Casting; Lattices; Magnetic anisotropy; Magnetic properties; Magnetostriction; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
