| Abstract: | The Dy and Ga substituted NdFeB nanocomposite permanent magnetic alloys with high magnetic properties have been prepared by appropriate wheel speed of melt-spinning and post-annealing treatment. Under optimal conditions, compared with the best magnetic properties of ternary NdFeB alloy of Jr=1.18 T, Hci=379.5 kA/m and (BH)max=119.5 kJ/m3, the best magnetic properties of the alloy with Dy and Ga substitutions are Jr=1.16 T, Hci=580.5 kA/m, and (BH)max=162.7 kJ/m3. The XRD and TEM results showed that each of two alloys consists of hard magnetic 2:14:1 phase and soft magnetic α-Fe phase. The grain size of the 2:14:1 phase is about equal in the two alloys. The grain size and content of α-Fe phase in Dy and Ga substituted alloy are finer and lower, respectively. |
