Effect of Fe Content on Microstructure and Magnetic Properties of NdFe10.25TiNb0.25N/α-Fe Permanent Magnet Alloy
The effect of Fe content on microstructure and magnetic properties of NdFe10.25TiNb0.25/x％α-Fe permanent magnet alloy was studied.The results show that alloy ingot is composed of α-Fe phase,1∶12 phase and Nd-rich phase.When Fe content increases,α-Fe phase content increases,but 1∶12 phase content decreases.The grain size of the thin strip decreases gradually with the increase in Fe content,and Fe2Ti phase is produced.The contents of Fe2Ti phase and Nd-rich phase decrease gradually with the increase in Fe content.When x≥ 15,the thin strip only has 1∶12 phase and α-Fe phase,and the average grain size is reduced to less than 60 nm.After nitriding,the average grain size is reduced by 15％-20％,and the magnetic properties are obviously improved.When x=15,the obtained nitrided alloy thin strip has better magnetic properties,coercivity is 80396 A/m,saturation magnetization is 130.7(A·m2).kg-1,which is 25％higher than that when x=0,and saturation magnetization is increased by 12％.After bonding,the maximum magnetic energy product decreases first and then increases,and reaches the highest value(32.08 kJ/m3)at x=15,which is increased by 40％compared with 22.92 kJ/m3 at x=0.The nitriding alloy thin strip at x=15 has good structural stability at high temperature,and maintains structural stability below 360 ℃,which has great application potential at high temperature.
NdFe10.25TiNb0.25/α-Fe alloyFe contentmelt fast quenchingmicrostructuremagnetic property
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