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利用X射线衍射分析仪、振动样品磁强计和差示扫描量热仪研究了非晶Nd9.5Fe76Co5Ti3B6.5合金条带晶化过程中Nd2Fe14B/α-Fe析出相的相结构及磁性能的变化。结果表明,在晶化过程中Nd2Fe14B相和α-Fe相分别在600℃、680℃退火时析出。随着退火温度的升高,α-Fe相晶粒比Nd2Fe14B相晶粒长大更明显:当温度由690℃升高到700℃,α-Fe相及Nd2Fe14B相的晶粒尺寸分别由22.4nm、32.8 nm长大到33.3 nm、39.8 nm。690℃退火时,硬磁相Nd2Fe14B和软磁相α-Fe之间具有较强的交换耦合作用,其晶粒尺寸分别为32.8 nm、22.4 nm。此时合金具有最佳的综合磁性能:Br=0.88 T,Hci=523.76 kA/m,(BH)max=100.01 kJ/m3。
The phase structure and magnetic properties of the Nd2Fe14B / α-Fe precipitated phase in amorphous Nd9.5Fe76Co5Ti3B6.5 alloy were studied by X-ray diffraction analyzer, vibrating sample magnetometer and differential scanning calorimeter. . The results show that Nd2Fe14B phase and α-Fe phase are precipitated at 600 ℃ and 680 ℃ respectively during the crystallization process. With the increase of annealing temperature, the α-Fe phase grains grow larger than the Nd2Fe14B phase grains: when the temperature is increased from 690 ℃ to 700 ℃, the grain sizes of α-Fe phase and Nd2Fe14B phase increase from 22.4nm , 32.8 nm up to 33.3 nm, 39.8 nm. When annealed at 690 ℃, Nd2Fe14B has a strong exchange coupling with the soft magnetic phase α-Fe, and its grain size is 32.8 nm and 22.4 nm, respectively. At this point the alloy has the best overall magnetic properties: Br = 0.88 T, Hci = 523.76 kA / m, (BH) max = 100.01 kJ / m3.