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通过高温X射线衍射研究了Cu, Cu-12Al和Cu-12Al-4Ni(质量分数, %)合金熔体结构, 发现纯Cu熔体结构因子具有显著对称的主峰, 主峰前曲线呈抛物线状, Cu-12Al合金熔体结构因子曲线主峰前有预峰出现, 而Cu-12Al-4Ni合金熔体结构因子曲线上预峰变得更加明锐, 预峰的出现是液体中存在中程有序的标志. 在Daken-Gurry理论基础上, 以原子间交互作用强度为依据, 分析了合金元素加入不同与熔体结构变化之间的相关性: Cu-Al原子间具有强烈的交互作用, 能形成较强的化学键, 化合物形成倾向大, 从而在熔体内形成中程尺度的原子团簇, 体现出中程有序的特征. Ni的加入, 有利于原子间交互作用的增强, 促进原子团簇的形成及其尺寸的增大, 使得预峰变得更加明锐.
The melt structures of Cu, Cu-12Al and Cu-12Al-4Ni (mass fraction,%) alloys were investigated by high temperature X-ray diffraction. The main structural peaks of pure Cu melt were found to be symmetrical. -12Al alloy melt structure factor curve before the main peak appeared pre-peak, and Cu-12Al-4Ni alloy melt structure factor curve pre-peak becomes more sharp, pre-peak appears in the liquid medium-range orderly signs. Based on the Daken-Gurry theory, based on the intensity of the interaction between atoms, the correlation between the addition of alloying elements and the change of the melt structure is analyzed: the Cu-Al atoms have a strong interaction and form strong Chemical bonds and compounds tend to form large, forming intermediate-scale clusters in the melt, showing the characteristics of medium-range order. The addition of Ni is conducive to the enhancement of the interaction between atoms and promotes the formation of atomic clusters and their size Increase, making the pre-peak becomes more sharp.