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Effect of Tb2Fe12Ga5 addition on microstructure and properties of Nd-Fe-B regenerated magnet
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DOI：10.1016/j.mtla.2026.102825.png)
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Abstract
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This paper introduces a method to enhance the magnetic properties and corrosion resistance of Nd-Fe-B regenerated magnet by incorporating low melting point heavy rare earth alloys at the grain boundaries. Therefore, the effects of Tb2Fe12Ga5 alloy with low melting point on the magnetic properties and corrosion resistance of Nd-Fe-B regenerated magnet under different addition levels were studied. Meanwhile, the coercivity enhancement and corrosion inhibition mechanism were systematically analyzed and explained through the microstructure changes. The waste Nd-Fe-B particles were blended with 3 wt% Tb2Fe12Ga5 powder to fabricate Nd-Fe-B regenerated magnet with the coercivity (Hcj) of 18.61 kOe, remanence (Br) of 12.51 kGs, and maximum energy product ((BH)max) of 38.63 MGOe, reaching performance recovery rates of 110.4%, 100.2%, and 101.1%, respectively, of the original magnets. The corrosion resistance of the regenerated magnets has also been significantly enhanced compared to the original magnets in a simulated seawater environment. The corrosion potential (Ecorr) measured increased from −1.175 V to −1.15 V, and the corrosion current (Icorr) decreased from 100.30 μA/cm2 to 61.64 μA/cm2 when 3 wt% Tb2Fe12Ga5 is added. Meanwhile, the regenerated magnet doped with Tb2Fe12Ga5 exhibited excellent mechanical properties, attributed to its optimized microstructure. Above findings may spur progress towards achieving large-scale production and reducing production costs, providing a potential industrialization solution for the green and efficient recovery of waste Nd-Fe-B magnet
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