Secondary recrystallization of Goss texture in magnetostrictive Fe-Ga-based sheets

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To avoid the unfavorable effect of precipitates on magnetic properties,low addition of 0.16 wt%NbC was employed in Fe82.5Ga17.5 alloy,and 0.27 mm sheets were successfully prepared by a rolling process.Strong Goss texture was obtained in Fe-Ga sheets by two-stage annealing process.The sulfur annealing in quartz ampoules was made to produce the preferred growth of Goss texture,with a 51%increase in the observed saturation magneto-striction,from 87 × 10-6 in the Ar-annealed sheets to 132 × 10-6 in the S-annealed sheets.However,large amounts of S-rich and Nb-rich precipitates were formed in the S-annealed sheets.High-temperature annealing of the S-annealed sheets at 1,200 ℃ under a flow hydrogen-argon atmosphere could effectively eliminate the precipi-tates and promote the selective growth of(110)grains due to the low surface energy.Large grains(~2 cm)of sec-ondary recrystallization were achieved in the final annealed sheets,with the maximum average saturation magneto-striction of 180 × 10-6.
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