Characterization of microstructure and coercivity of Nd–Fe–B magnets with Ti and Al or Cu addition
Time: 2018/4/5 Hits: 1973
The effects of high-melting element Ti addition together with low-melting element Al or Cu on microstructure and coercivity of Nd 22Fe 71B 7 magnets were investigated. It was found that an appropriate amount of Ti could significantly enhance the coercivity of magnets. However, higher amounts of Ti addition led to a loss of coercivity and a demagnetization curve with poor rectangularity. Microstructural studies revealed that the improvement of the coercivity was attributed to a well-distributed intergranular phase and even grain boundary of main phase. An abnormal growth of main phase was found in the magnets with higher amounts of Ti addition, resulting in a loss of coercivity and a demagnetization curve with poor rectangularity. By comparing the effect of the combined addition with that of the single addition (Al, Cu or Ti), it was also found that the combined addition of high-melting and low-melting elements may be a better approach to modify the coercivity of Nd-Fe-B magnets。
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