Abstract
Herein, a simple and efficient method is proposed for fabricating Fe81Ga19 alloy thin sheets with a high magnetostriction coefficient. Sharp Goss texture ({110}<001>) was successfully produced in the sheets by rapid secondary recrystallization induced by nanosized NbC particles at low temperatures. Numerous NbC precipitates (size ~90 nm) were obtained after hot rolling, intermediate annealing, and primary recrystallization annealing. The relatively higher quantity of nanosized NbC precipitates with 0.22 mol% resulted in finer and uniform grains (~10 μm) through thickness after primary recrystallization annealing. There was a slow coarsening of the NbC precipitates, from 104 nm to 130 nm, as the temperature rose from 850 °C to 900 °C in a pure nitrogen atmosphere, as well as a primary recrystallization textured by strong γ fibers with a peak at {111} <112> favoring the development of secondary recrystallization of Goss texture at a temperature of 850 °C. Matching of the appropriate inhibitor characteristics and primary recrystallization texture guaranteed rapid secondary recrystallization at temperatures lower than 950 °C. A high magnetostriction coefficient of 304 ppm was achieved for the Fe81Ga19 sheet after rapid secondary recrystallization.
Highlights
A large number of microsized NbC particles act as a strong inhibitor for the Fe–Ga thin sheet, but the surface energy effect of H2 S is the main driving force for secondary recrystallization at high temperatures ranging from 1200 to 1300 ◦ C, because the texture formed in primary recrystallization contributes little to the abnormal grain growth (AGG) of the Goss texture [18,32]
In the present study, owing to the regulation of the instability and intensity of the inhibitors and the favorable primary recrystallization, a sharp Goss texture with a large magnetostriction coefficient was achieved by rapid secondary recrystallization at a low temperature without the application of a special atmosphere
Fe81 Ga19 + 0.22 mol% NbC sheets with a sharp Goss texture were successfully produced by a simple and efficient conventional rolling and annealing method induced by nanosized NbC precipitates
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. When nanosized precipitates of NbC or sulfide are used as the inhibitor in an Fe–Ga thin sheet, a long annealing time (>10 h) and high temperature (>1050 ◦ C) are necessary to ensure coarse inhibitors to induce the AGG of the Goss texture in the thin sheet. These conditions will reduce the magnetostriction coefficient of the thin sheets because of the volatilization loss of. The inhibitor, microstructure, and texture evolution were explored to clarify the development of rapid secondary recrystallization at a low temperature in the thin sheet
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