近年来，稀土永磁材料的巨大需求导致稀土资源的过度消耗，新型低稀土或非稀土永磁材料成为研究热点。项目拟通过热压/热变形制备MnBi/Nd2Fe14B各向异性复合磁体，研究快速凝固及热压变形过程中锰铋合金NiAs晶型和钕铁硼合金2:14:1相纳米晶的生长和取向规律，深入分析不同流变阶段原子输运、缺陷演化、晶粒生长及滑移转动过程，实现磁-热-力协同作用诱导下对非稀土硬磁相与稀土硬磁相单轴织构的控制。阐明MnBi/Nd2Fe14B纳米复合永磁体系中交换耦合作用强度与两硬磁相分布及取向的关联性、不同温度下微磁参数与微结构参数的依赖关系，进一步探明磁体内部交换耦合和外磁场共同作用下介观磁畴结构的响应机制，为获得具有强取向低温度系数MnBi/Nd2Fe14B复合磁体提供理论依据。

In recent years, the huge demand of rare earth permanent magnetic materials leads to the excessive consumption of rare earth resources. In this project, MnBi/Nd2Fe14B anisotropic composite magnets are prepared by hot pressing and deformation. The growth and orientation of the NiAs phase of MnBi alloy and the 2:14:1 phase of Nd-Fe-B alloy is investigated in the process of rapid solidification and hot pressing deformation, the processes of atomic transport, defect evolution, grain growth and slip rotation are analyzed in detail, Uniaxial texture of non rare earth and rare earth hard magnetic phase is induced by the action of magnetic field, heat and pressure. The dependence of exchange coupling strength on two magnetic phase distribution and orientation, and micromagnetic parameters on microstructure parameters at different temperatures is revealed. The response mechanism of domain structure to internal exchange coupling and external magnetic field is demonstrated. The above results will contribute to the theoretical research for developing MnBi/Nd2Fe14B nanocomposite permanent magnet with strong orientation and low temperature coefficient.