The liquid structure of Al 71.6 Ge 28.4 eutectic alloy was studied by X-ray diffractometer. For the liquid alloy Al 71.6 Ge 28.4 , the structure has no change while the order increases with the decreasing temperature from 1150°C to 550°C. Meanwhile, the correlation between liquid structure and solid structure has also been analyzed by "the nanocrystal model". It is shown that the melt consists of 72.8% α clusters and 27.2% β clusters, but the liquid structure and solid structure have striking difference, which is one of the reasons to obtain a large undercooling easily for this alloy. liquid structure, X-ray diffraction, nanocrystal model, liquid-solid correlation, undercooling Citation: Sun J J, Tian X L, Zhan C W, et al. Structure correlation of Al 71.6 Ge 28.4 eutectic alloy between liquid and solid state.The Al-Ge alloy is a simple eutectic system. It has been extensively investigated because of the metastable phase during solidification. The phase has an excellent performance in superconductivity [1-3]. McAlister and Murray [4] collected a lot of research results at an earlier stage. Based on these information, Srikanth et al. [5] observed the metastable phase diagram. Recently, Al-Ge alloy can obtain deep undercooling with an electromagnetic oscillating drop method [6,7], so more and more investigations have been performed on the metastable phase at a deep undercooling state.The liquid structure of Al-Ge alloy has also been investigated. The electronic density of states of this alloy has been measured by Gamppet et al. [8] both in the liquid and in the amorphous state. A decrease of density of states at the Fermi level has been measured for the amorphous state, a small one in the liquid state, vanishing with temperature. This feature has been explained as being induced by the atomic structure. Grosdidier and Gasser [9] obtained the structure factors by neutron scattering on liquid Al-Ge alloys. A characteristic peak was found on every curve of the structure factor. The peak decreased from aluminum-rich alloys to germanium-rich alloys. They pointed out that the particular shape of the alloy structure factor was mainly due to the germanium-germanium interaction.To sum up the above arguments, the investigations are a series of studies intended to focus on the fields of metastable phase and particularity of liquid structure. However, our understanding of liquid structures, including the structure correlation between liquid and solid states, is relatively imperfect although the investigations on the liquid structure have been carried out for a long time. It is still an important and unsolved problem in condensed state physics. In addition, the reason of undercooling state about Al-Ge alloy during solidification is hardly reported. So it is necessary to explore the cause of undercooling from the point of the structure correlation between liquid and solid states.In this paper, the scattering intensities of liquid Al 71.6 Ge 28.4 alloy were investigated by means of X-ray diffraction from the temperature above liqu...
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With the high-temperature viscometer and magnetic susceptibility measurement device designed by our group, the viscosity and the magnetic susceptibility of the Cu 65 Sn 35 melt were measured during the cooling process. An anomalous change can be found in the curves of viscosity and magnetic susceptibility at a certain temperature. The structure of the melt was studied by the high-temperature X-ray diffractometer. The anomalous change also can be found in the pair distribution function, correlation radius, and coordination number at the approximate temperature, which shows the microstructural change of the Cu 65 Sn 35 melt. From the results, it was confirmed that the Cu 6 Sn 5 compound occurs in the melt, which leads to the structural change of the melt.
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