Fe-Ga合金是唯一兼具优良磁致伸缩性能与力学性能的新型磁致伸缩材料。有效叠加<100>取向锋锐化与纳米异质相强化效应大幅提升Fe-Ga合金多晶薄带的磁致伸缩系数，是高能磁致伸缩器件开发的关键。目前Fe-Ga合金多晶薄带中Goss织构({110}<001>)锋锐度低、RE元素掺杂纳米异质相强化效应还未得到应用。本项目针对RE元素掺杂Fe-Ga合金多晶轧制薄带，通过综合调控析出相热稳定性与尺寸特征，构建热稳定性有序配合的多尺度复合抑制剂体系；阐明RE元素界面偏聚对析出相形成与粗化行为的影响规律，揭示抑制力衰减规律与二次再结晶织构的匹配关系；解析RE元素掺杂纳米异质相的形成规律及其与晶粒取向匹配关系的影响机制。突破轧制Fe-Ga合金多晶薄带二次再结晶Goss织构锋锐化与RE元素掺杂纳米异质相协同控制的关键瓶颈，为超高性能大磁致伸缩Fe-Ga合金多晶薄带的制备与工程应用奠定理论与技术基础。

Fe-Ga alloy is the unique magnetostrictive material combining excellent magnetostrictive and mechanical properties. The current problem of polycrystalline Fe-Ga alloy thin sheet is the poor sharpness of Goss texture ({110}<001>) and unapplied strengthening effect of RE element on nanoheterogeneity phase. It demands to enhance the magnetostriction coefficient of Fe-Ga alloy thin sheet by the synergistic strengthening of <100> orientation and nanoheterogeneity phases. A multi-scale composite inhibitor system with orderly coordination of the thermal stability of the precipitate phase is going to be established based on the comprehensive analysis of the nucleation and growth of precipitated particles in RE doped Fe-Ga polycrystalline thin sheet. The matching relationship between the attenuation of inhibitor force and secondary recrystallization texture is clarified based on the intervention effect of the interfacial segregation by RE element on the precipitating and coarsening behavior of particles. The evolution of the nanoheterogeneity phase, as well as the matching mechanism between the nanoheterogeneity phase and the polycrystalline orientation, are investigated. This program expects to break through the bottleneck of the insufficient coordination of texture and nanoheterogeneity phase in the RE doped Fe-Ga alloy polycrystalline thin sheet, which lays an important foundation for the preparation and engineering application of the ultra-high performance of Fe-Ga alloy sheet.