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Changes in magnetostriction of polycrystalline Tb-Dy-Fe casting alloys after annealing

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3 Author(s)
Ono, Hideaki ; Mater. Res. Lab., Nissan Motor Co. Ltd., Yokosuka, Japan ; Shimada, Munekatsu ; Toma, Hideo

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

Published in:

Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 2 )

Date of Publication:

Mar 2001

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