利用二次再结晶获得择优织构是巨磁致伸缩Fe-Ga合金薄带研究的核心问题。本工作采用XRD、SEM、EBSD和TEM等分析技术研究了Fe-Ga合金薄带退火过程中织构、析出相和晶界特征演变规律，并探讨了Fe-Ga合金轧制薄带中二次再结晶Goss ({110}<001>)织构的形成机制。结果表明，初次再结晶织构由强γ织构和弱Goss织构组成，基体中弥散分布着高密度且尺寸为20~40 nm的MnS和NbC析出相。退火过程中析出相的粗化及其体积分数和密度的降低导致析出相对晶粒长大抑制力的减弱。初次再结晶到二次再结晶期间，Goss晶粒中析出相的密度始终低于γ晶粒。同时，二次再结晶前，无数量与尺寸优势的Goss晶粒被更多高能晶界所包围。Goss晶粒与基体晶粒间析出相和高能晶界特征的差异为Goss晶粒二次再结晶提供了充足驱动力，在未引入表面能条件下获得完善的二次再结晶组织，Fe-Ga合金薄带饱和磁致伸缩系数可高达250 × 10^-6。

The core issue in the study of giant magnetostriction of Fe-Ga alloy thin sheet is to obtain preferential texture through secondary recrystallization. In this work, the evolution of the texture, precipitation, and grain boundary characteristics of an Fe-Ga alloy thin sheet during the annealing process were investigated using XRD, SEM, EBSD, and TEM. The mechanism of the secondary recrystallization of the Goss ({110}<001>) texture in the Fe-Ga alloy thin sheet was analyzed. The results show that the primary recrystallized thin sheet is composed of strong γ-fibers and has a weak Goss texture. Moreover, high-density MnS and NbC precipitates of size 20-40 nm are dispersedly distributed in the matrix grains after primary recrystallization. The coarsening of the precipitates and a decrease in the volume fraction and density weaken the inhibiting force during the annealing process. The density of the precipitates inside the Goss grains is lower than that of the precipitates in the matrix grains with γ-texture during the process from primary recrystallization to secondary recrystallization. Before the occurrence of secondary recrystallization, Goss grains do not exhibit a number and size advantages over the matrix grains but are surrounded by higher-energy grain boundaries than the matrix grains. The differences between the Goss and matrix grains in terms of precipitation and high-energy grain boundary characteristics during primary recrystallization provide an additional driving force for the secondary recrystallization of Goss grains. Therefore, a perfect secondary recrystallization of the Goss texture with a saturation magnetostriction coefficient of 250 × 10^‒6 is produced in the Fe-Ga alloy thin sheet without the introduction of the surface energy effect using a special annealing atmosphere.