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研究了不同退火温度对(Fe_(0.5)Co_(0.5))_(78.4)Si_9B_9Nb_(2.6)Cu_1纳米晶软磁合金结构和高频磁性的影响。结果表明,在初始晶化温度455℃以上退火,在非晶基体中析出α—FeCo相。随着退火温度的升高,开始出现有序的(Fe,Co)_3Si。当退火温度高于620℃时,出现硼化物硬磁相。490℃退火后合金的初始磁导率最高可达23000,晶粒尺度为19.4 nm。在490~610℃退火,随退火温度的提高,合金复数磁导率下降,但截止使用频率提高。实验观察到该合金的磁谱曲线为驰豫型,截止使用频率f_r为3.14~5.64 MHz,明显高于Fe基纳米晶软磁合金。
The effects of different annealing temperatures on the structure and high-frequency magnetic properties of (Fe_ (0.5) Co_ (0.5)) _ (78.4) Si_9B_9Nb_ (2.6) Cu_1 nanocrystalline soft magnetic alloys were investigated. The results show that the initial crystallization temperature above 455 ℃ annealing, precipitation of α-FeCo phase in the amorphous matrix. As the annealing temperature increases, ordered (Fe, Co) 3Si begins to appear. When the annealing temperature is higher than 620 ℃, the boride hard magnetic phase appears. After 490 ℃ annealing, the initial permeability of the alloy can reach up to 23000 and the grain size is 19.4 nm. Annealing at 490 ~ 610 ℃, with the annealing temperature increases, the complex magnetic permeability decreased, but the cut-off frequency increased. The magnetic curve of the alloy was observed to be a relaxation type. The cut-off frequency f_r was 3.14-5.64 MHz, which was obviously higher than that of the Fe-based nanocrystalline soft magnetic alloy.