Liquid structure of undercooled Cu70Ni30 alloy

Tian, Xuelei; Chen, Xichen; Ilinsky, A.G.

doi:10.1007/bf02880067

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…Every RDF curve in Figure 2 is added 10 relative to the former one, and every PDF curve in Figure 3 is added 0.5. The detailed processing and error analysis of the X-ray diffraction used in this experiment were described in [10][11][12][13][14][15].…”

Section: Resultsmentioning

confidence: 99%

Structure correlation of Al71.6Ge28.4 eutectic alloy between liquid and solid states

et al. 2010

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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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Section: Resultsmentioning

confidence: 99%

Structure correlation of Al71.6Ge28.4 eutectic alloy between liquid and solid states

et al. 2010

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“…Theoretically, the correlation radius of clusters, r c , is the minimum value of r where g ( r ) = 1, since g ( r ) = 1 means that the correlation disappears between the reference atom and other atoms , Figure illustrates the temperature dependences of r c for the liquids of different Al 100 - x Cu x ( x = 18, 25, 30, 35) alloys. r c shifts toward smaller values with increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic Basis for Cluster Kinetics: Prediction of the Fragility of Marginal Metallic Glass-Forming Liquids

Bian

Qin

et al. 2006

J. Phys. Chem. B

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Due to the inaccessibility of the supercooled region of marginal metallic glasses (MMGs) within the experimental time window, we study the cluster kinetics above the liquidus temperature, Tl, to acquire information on the fragility of the MMG systems. The thermodynamic basis for the stability of locally ordered structure in the MMG liquids is discussed in terms of the two-order-parameter model. It is found that the Arrhenius activation energy of clusters, Deltah, is proportional to the chemical mixing enthalpy of alloys, DeltaH(chem). Fragility of the MMG forming liquids can be described by the ratio of the absolute DeltaH(chem) value to the glass transition temperature, Tg. The manner of vitrification during rapid solidification is an important factor for the discrepancy between the data presented in this paper and the prediction of the two-order-parameter model concerning the relation between Delta h and the liquid fragility.

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“…In order to understand the temperature dependence of r 1 in isomorphous liquids better, r 1 of Cu 70 Ni 30 [27] and Ag 95 Au 5 melts are plotted (both of which are isomorphous), together with Cu 40 Ag 60 [19], Al 71.6 Ge 28.4 [28], Co 79.5 Sn 20.5 [29], In 98.2 Cu 1.8 [30], and Au 81 Si 19 melts (all of which are eutectic) in Fig. 10.…”

Section: Alloymentioning

confidence: 99%