Effect of solution temperature on the microstructure of 2:17 type SmCo magnets

The exceptional magnetic properties of 2:17 type SmCo magnet material is the results of its unique cellular structure. We conducted a systematic analysis of the evolution of the solid solution temperature on the microstructure of both the solid solution precursor and the final magnet, and revealed the distribution of elements affect by the magnet`s properties. The findings show that a considerable number of short-range low-order microregions are observed with discontinuous alignment orientations, and overlapping zones are produced in the solid solution precursor by low-temperature solid solutions. The aging process makes these regions challenging to organize, and a lot of 2:17 R phases form close to 1:5 H cell boundary phase and grain boundary, which impedes the enhancement of magnetic characteristics. Increasing the solution temperature promotes the diffusion of Cu and Fe elements, accelerating the ordering of the 2:17 R phase and aiding in the creation of a cellular structure. The phase evolution of the 2:17 type SmCo magnet can be better understand by referring to the previously conducted research on the impact of solid solution temperature on the microstructure of the solid solution precursor and final magnet.