中文摘要：

利用x射线衍射分析（XRD）和BH测试仪分别研究了元素Tb、zr的添加对HD法制备NdFeB永磁体的微结构及磁性能的影响规律。微结构研究表明，元素Tb、zr添加前后的磁体都主要由四方相Nd2Fe14B（P42／mnm）和微量的富Nd相构成；但Tb和zr的添加明显改变了永磁体的取向特性和磁性能；采用HORTA法计算表明，Tb和Zr的添加虽然都使永磁体的（004）、（006）、（008）极密度因子减小，但是室温下磁性能测试表明，zr的添加降低了磁体的矫顽力，而Tb添加后永磁体的矫顽力有了明显的提升，从2038kA／m提升到2302kA／m;Kronmiiller-Plot关系曲线表明，3种合金的矫顽力机理均为磁畴成核反转机制。

英文摘要：

The effect of Tb and Zr addition on the microstructure and magnetic properties of the NdFeB magnets prepared by HD method were analyzed by X-ray diffraction （XRD） and BH magnetic measurement. The results of the microstructure show that the Tb or Zr doped permanent magnets are both composed of dominant tetragonal phase Nd2Fe14B （P42/mnm） and trace Nd-rich phase. The orientation degree and magnetic properties of the magnets are both varied obviously with the addition of Tb and Ti. Adding Tb and Zr reduces the pole density factor of the （004）, （006） and （008） crystal faces of the permanent magnets, which is estimated by Horta formula. The magnetic properties dependence on the room temperature shows that the coercivity of the Zr-doped magnets is reduced, but the coercivity of the Tb-doped magnet is increased from 2038 kA/m to 2302 kA/m. The study of the Kronmtuller-Plot behavior shows that nucleation is the dominating mechanism for the magnetization reversal in these three alloys.