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本文研究了NdFeB三元系永磁合金在恒温(773～1023K)回火过程中组织结构与性能的变化。实验结果表明:在回火初期(1～3min)矫顽力较快地提高,达到峰值后矫顽力又降低。回火温度越低,矫顽力达到峰值所需的时间越长,与烧结态相比,回火后矫顽力可提高1倍。回火前后合金的基体相没有变化,都是单相的,没有缺陷。回火过程仅是晶界,特别是晶界交隅处发生晶化与共晶转变。回火后矫顽力的提高与晶界的变化有关。
In this paper, the changes of microstructures and properties of NdFeB ternary permanent magnet alloys during tempering at constant temperature (773 ~ 1023K) were studied. The experimental results show that the coercive force increases rapidly in the early stage of tempering (1 ~ 3min), and coercivity decreases after reaching the peak value. The lower the tempering temperature, the longer the coercive force reaches the peak value, and the coercivity after tempering can be increased by 1 times compared with the sintered state. Before and after tempering the matrix phase of the alloy has not changed, are single-phase, no defects. Tempering process is only the grain boundary, especially at the intersection of the grain boundary crystallization and eutectic transformation. After tempering, the improvement of coercivity is related to the change of grain boundary.