中文摘要：

采用放电等离子烧结技术制备了热压／热变形Nd2Fe14B／α—Fe纳米双相复合永磁，研究了不同烧结条件对热压磁体致密度和性能的影响，以及热变形工艺对磁体微观结构及磁性能的影响．结果表明，随着热压温度的升高，磁体的密度和剩磁逐渐增大，矫顽力呈降低趋势，最大磁能积随温度的变化先升高后降低，最大值为94．7kJ／m^3．热变形后样品内Nd2Fe14B主相晶粒的（00L）轴逐渐转向与压力平行的方向，形成磁晶各向异性，但同时由于缺乏富Nd相及晶粒过度长大，磁性能呈下降趋势．

英文摘要：

The hot pressing and hot deforming Nd2Fe14B/α-Fe nanocomposites were produced by Spark Plasma Sintering technique. Effects of pressing conditions of the microstructure and magnetic properties of themagnets were investigated. The results show that with the increase of hot press temperature, the density and the remanence of the magnets increase, while the coercivity decreases gradually, which leads to the rising of the energy at first and then decreasing. The maxium was at 94.7 kJ/m^3. After hot deformation, the （00L）axis of Nd2Fe14B crystalline turned parallel to the direction of compressive pressure, thereby the magnetic anisotropic magnets were gained. However, the grain size became quite large due to high deforming temperature, therefore, the magnetic properties reduced sharply accordingly.