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研究了Ｃｏ６８Ｆｅ７Ｎｂ５Ｓｉ１２Ｂ８和Ｃｏ６４Ｆｅ１１Ｎｂ５Ｓｉ１２Ｂ５两种非晶合金在４００～５８０℃温度间等温退火１ｈ后的纳米晶化行为和磁性．结果表明，在４５０～５６０℃退火ｌｈ后，在两种非晶合金的基体上均析出了单一晶相ｂｃｃ结构的α－Ｆｅ（Ｃｏ）固溶体当退火温度（Ｆａ）低于４７０℃时，合金具有很好的软磁性能；Ｔａ为５４０～５６０℃，矫顽力明显增加，在弱场下磁化强度变得很低；当Ｔａ≥５８０℃时，新的晶化相Ｃｏ－Ｂ，Ｆｅ－Ｂ及其它化合物析出，磁性变得比较软这可能是由于具有ｂｃｃ结构的α－Ｆｅ（Ｃｏ）相具有大的磁致伸缩．
The nanocrystallization and magnetic properties of Co68Fe7Nb5Si12B8 and Co64Fe11Nb5Si12B5 amorphous alloys after isothermal annealing at 400-580 ℃ for 1h were studied. The results show that when annealed at 450-560 ℃ for 1h, the α-Fe (Co) solid solution with single crystal phase bcc structure precipitated on the two amorphous alloys. When the annealing temperature (Fa) is lower than 470 ℃, the alloy Has a good soft magnetic properties; Ta is 540 ~ 560 ℃, coercivity increased significantly in the weak field magnetization becomes very low; when Ta ≥ 580 ℃, the new crystalline phase Co-B, Fe- B and other compounds are precipitated and the magnetism becomes softer. This may be due to the large magnetostriction of the α-Fe (Co) phase having the bcc structure.