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 crystallization behavior of amorphous alloys Fe_(80-x)Cu_xSi_5-B_(15) and(Fe_(1-y) Co_(y))_(82)Cu_4Si_(4.4)B_(13.2), has been studied by X-ray diffraction, Mossbauer γ-rayabsorption and conversion electron emission. Crystallization of amorphous ribbonprepared by means of single roller quenching starts at rough side in contact withroller. The product of crystallization is α-Fe. When a small amount of Fe issubstituted by Cu in amorphous Fe_(80)Si_5B_(15), the crystallization temperature increase.If the content of transition metal is more than 80 at.-%, for example 82 at.-%,a marked drop in crystallization temperature occurs. Three crystalline phases: α-Fe,Fe_2B and Fe_3B are coexistent for these two serises of Si-containing amorphousalloys after annealed 2h at 400--450℃. The metastable phase Fe_3B further trans-forms into Fe_2B and α-Fe at higher temperature.
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