(西安交通大学材料学院， 西安 710049)
摘 要: 研究了氢化／歧化／脱氢／重组(简称HDDR)工艺过程中NdFeCoZrB合金相组成和磁性能的变化规律。结果表明，经氢化／歧化后合金中除了正常的歧化产物外，还存在少量未分解的Φ 相晶粒残核；在脱氢／重组过程中，随着真空中氢气压力ps 的降低， 磁粉中重组形成的Φ 相的体积分数不断增加，同时粉末粘结磁体的内禀矫顽力线性升高， 磁各向异性值在ps＝60 kPa处出现最大值。分析表明，HDDR粉末的磁各向异性是通过重组过程中Φ 相在残留晶核处的择优形核形成的，但在较低的ps 下Φ相还发生了任意形核，并对HDDR粉末磁各向异性的形成具有不利影响。
关键字: NdFeB HDDR 显微组织 磁各向异性
（School of Materials, Xi'an Jiaotong University, Xi'an 710049）
Abstract:Phases and magnetic properties of NdFeCoZrB alloy during the HDDR process were studied. It was found that some residual particles of Φ phase co-exist with decomposed products in the disproportionated alloy. During the desorption-recombination transformations, the volume fraction of recombined Φ phase is increased with decreasing hydrogen pressure ps in vacuum, and intrinsic coercivity of bonded magnets is linearly increased whereas a maximum anisotropy is determined at ps =60 kPa. The results suggest that a preferred nucleation on the basis of the residual particles of Φ phase be the origin of anisotropy of HDDR-received powders, but a random nucleation under lower ps produces negative effect on the development of anisotropy.
Key words: NdFeB HDDR< microstructure anisotropy
