采用Lorentzian法和非晶计算理论，分析少量稀土Y取代Fe对Fe78 Si9 B13非晶合金微观结构的影响，从微观结构变化的角度对合金非晶形成能力及热稳定性的变化做出相应解释。结果表明：随着Y含量的增加，合金的第一近邻半径逐渐增大，原子排布有序度降低，非晶漫散射峰的半高宽增大；非晶合金的配位数和堆垛密度均随着Y含量的增加先增大后减小，分别从短程序和中程序的角度反映出原子密排程度随Y含量的增加先增后减，这与合金非晶形成能力和稳定性的变化趋势相一致。%Lorentzian method and amorphous computing theory were used to analyze the effect of partial substitution of Fe with rare earth element Y on the microstructure of the Fe78 Si9 B13 alloy, and explain the amorphous alloy forming ability and thermal stability of the alloys accordingly by change of microstructure. It is found that with the increase of Y in Fe-Si-B amorphous alloy, radius of the first neighbor of the alloy increases, atomic arrangement order decreases, and the amorphous diffuse scattering peak FWHM increases. Besides, the coordination number and stacking density of the amorphous alloys increase first and then decrease, which indicates the extent of close-packed atoms increases and decreases from the perspective of the short-range order and middle-range order. It is consistent with the variation of the forming ability and thermal stability of the amorphous alloys.
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