Title :
Abnormal (110) Grain Growth and Magnetostriction in Recrystallized Galfenol With Dispersed Niobium Carbide
Author :
Na, Suok-Min ; Yoo, Jin-Hyeong ; Flatau, Alison B.
Author_Institution :
Dept. of Aerosp. Eng., Univ. of Maryland, College Park, MD, USA
Abstract :
The influence of high temperature annealing processes on abnormal grain growth in Galfenol (Fe81Ga19 alloy plus 1 mol% NbC) sheet is examined in this paper. Results are presented on magnetostriction and grain orientation after rolling and annealing processes. Abnormal (110) grains grew to several millimeters after annealing at 1200degC. The grain orientation changed from a gamma -fiber texture and {100}lang011rang orientation in as-rolled sheet to close to a Goss texture {110}lang001rang in a sample annealed at 1200degC. This was accompanied by an increase in magnetostriction. The lang001rang easy axis (-20deg-off of the rolling direction) and a maximum magnetostriction of 183 ppm was observed in samples annealed at 1250degC. Annealing at a temperature of 1300deg C produced a change in grain orientation to {111}<uvw>, Ga loss of as much as 2.8%, and a degradation in magnetostriction.
Keywords :
annealing; gallium alloys; grain boundaries; grain growth; high-temperature effects; iron alloys; magnetostriction; niobium compounds; recrystallisation; rolling; texture; (110) grain growth; Fe81Ga19-NbC; Goss texture; dispersed niobium carbide; gamma -fiber texture; grain boundary; grain orientation; high temperature annealing process; magnetostriction; recrystallized Galfenol; rolling; temperature 1200 C; temperature 1250 C; temperature 1300 C; Abnormal grain growth; Galfenol; Niobium carbide; magnetostriction; texture;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2021398
