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用X射线衍射、吸收和内转换电子发射Mossbauer谱技术,研究了Fe_(80-x)Cu_xSi_5B_(15)和(Fe_(1-y)Co_y)_(82)Cu_(0.4)Si_(4.4)B_(13.2)两系列非晶合金的晶化行为.单辊急冷法制备的非晶带,晶化首先从贴辊面开始,晶化产物为α-Fe相.在Fe_(80)Si_5B_(15)非晶合金中以少量Cu替代Fe可以提高晶化温度.我们的结果表明,过渡金属的含量超过80at.-%,如增加到82at.-%,晶化温度就明显降低.所研究两系列含Si的铁基非晶合金在400—450℃范围内退火2h,都出现α-Fe,Fe_3B和Fe_2B三种晶态相共存状态.退火温度再升高,亚稳相Fe_3B逐渐转变为Fe_2B和α-Fe.
The effects of Fe_ (80-x) Cu_xSi_5B_ (15) and (Fe_ (1-y) Co_y) _ (82) Cu_ (0.4) Si_ (4.4) B_ (13.2) Crystallization Behavior of Two Series of Amorphous Alloys Amorphous ribbons prepared by single-roll quenching were firstly crystallized into α-Fe phase from the surface of roller, Amorphous alloys with a small amount of Cu instead of Fe can increase the crystallization temperature.Our results show that the transition metal content of more than 80at .-%, if increased to 82at .-%, the crystallization temperature was significantly reduced. Si iron-based amorphous alloy annealed at 400-450 ℃ for 2h, the coexistence of three α-Fe, Fe3B and Fe2B phases appear.The annealing temperature increases and the metastable phase Fe3B gradually changes to Fe2B and α -Fe.