采用fluctuation electron microscopy (FEM)对Al85Ni5Y 10-xCo x (x=0, 2)和 Cu 46Zr 54-x Al x (x=0, 7)金属玻璃的微观结构进行了表征, 研究了合金成分变化对金属玻璃微观结构的影响. 结果表明, 2种金属玻璃体系中均存在较强的中程有序结构; 少量元素的添加提高了合金微观结构的均匀性. 金属玻璃中程有序结构均匀性的增加有利于改善合金的玻璃形成能力.
Al85Ni5Y10-xCox (x = 0, 2) and Cu46Zr54-xAlx (x = 0, 7) metallic glasses (MGs) have been examined using fluctuation electron microscopy (FEM). Strong medium-range order (MRO) was revealed in both MG systems, by peaks in intensity variance curves. Minor changes in composition result in differences in these peaks, while diffraction patterns remain identical. Specifically, minor alloyings of Co into the Al85Ni5Y10 and Al into the Cu46Zr54, forming Al85Ni5Y8Co2 and Cu46Zr47Al7 MGs, render the medium-range structure more homogeneous. This is in a good agreement with the increase of glass-forming ability in the two systems. This result sheds light on FEM as a useful tool to totally sense the structural changes in the medium range, helpful to study the effect of sample composition on properties of metallic glasses.
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