Papers by Keyword: Liquid Structure

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Authors: Ning Yang, Yong Sun, Hui Zhang
Abstract: Molecular dynamics (MD) simulations was used to investigate the structures and evolution of atom clusters in liquid Al-Pb alloys. Pair correlation functions and chemical short-rang-order (CSRO) parameters indicate that inhomogeneous atoms are prone to be repulsed while Al-Al and Pb-Pb clusters are easy to emerge. The Voronoi analysis shows that the main coordination number around Al atoms and polyhedron index vary with Pb increasing. The main coordination number abruptly decrease from 11 to 9 when the Pb atomic percentage range from 30% - 40% , proving that Al-Al and Pb-Pb clusters are prone to be separated.
1840
Authors: Heng Rong Guan, Feng Shi Yin, Xiao Feng Sun, Zhuang Qi Hu
Abstract: The effect of melt treatment on the microstructure and creep-rupture behavior of M963 superalloy at 1248K under 225MPa has been investigated. The microstructure of the as-cast superalloy without melt treatment consists of γ solid solution matrix, γ´precipitate, coarse blocky MC carbide and (γ+γ´)eutectic. The striking difference in microstructure is that the melt treatment changes the MC carbide from the coarse blocky morphology into the fine script-like morphology. After heat-treated at 1483K for 4h followed by air-cooling, both the creep life and rupture elongation of the melt-treated alloy are all doubled those of the alloy without melt treatment. The mechanism of the melt treatment on the creep-rupture behavior of the M963 superalloy is discussed.
553
Authors: K. Jerie, A. Baranowski, B. Jezowska-Trzebiatowska, J. Glinski
1605
Authors: Roberto Montanari, Alessandra Varone
Abstract: Liquid Pb–Bi eutectic alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system. The alloy has been characterized in liquid state from melting (125 °C) to 650 °C by mechanical spectroscopy. Experiments have been carried out using hollow reeds of austenitic stainless steel filled with the Pb-Bi alloy and sealed at the extremities. From 350 °C to 520 °C modulus shows a remarkable drop accompanied by a broad internal friction maximum. In the same temperature range radial distribution functions, determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The anelastic phenomena have been attributed to a structural re-arrangement of liquid metal. For comparison, other alloys of the Pb-Bi system with hypo-eutectic composition have been investigated.
434
Authors: Xiu Fang Bian, Jing Yu Qin, Wei Min Wang, Xiao Gang Qi
343
Authors: Yan Bo Deng, Hao Ran Geng, Yu Jie Sun, Xin Ying Teng, Yan Wang
Abstract: In the present work, the resistivity of Ga36.5Sb63.5 alloy during cooling process was studied by the method of DC Four electrodes . The result of the experiment showed that there is an anomalous point at 710°C-735°C on the resistivity-temperature curve of Ga36.5Sb63.5 melt. At the same time, The relevance of the resistivity and the liquid structure of the alloy was analyzed. The physical properties of Ga36.5Sb63.5 alloy melt was discussed.
777
Authors: Paolo Deodati, Franco Gauzzi, Roberto Montanari, Alessandra Varone
Abstract: Liquid Pb–Bi eutectic (LBE) alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system (ADS). The alloy has been characterized in liquid state from melting (125 °C) to 750 °C by mechanical spectroscopy, i.e. internal friction (IF) and dynamic modulus measurements. The experiments have been carried out using hollow reeds of austenitic stainless steel filled with Pb-Bi alloy and sealed at the extremities. Dynamic modulus showed a remarkable drop in the range 350-520 °C. In the same temperature range radial distribution functions (RDFs), determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The phenomenon has been explained as a structural re-arrangement of atoms in the liquid metal.
878
Authors: Ting Lv, Hong Liang Zheng, Feng Xiang Guo, Xue Lei Tian
Abstract: The liquid structure of Ni2Sb98 eutectic alloy is studied with the method of X-ray diffraction and measurements of viscosity in this paper. Covalent bonding structures, which are characterized by the shoulder on the high- Q side of the first peak of structure factors, are observed over the full measuring temperature range. And the split of second peak of the pair correlation function suggests that the chemical short-range order structure exits in the melt. Correspondingly, variation of the viscosity obeys the Arrhenius law except the abrupt point near 1025K and the electrical resistivity changes abnormally at about 1020K. In addition, the coordination numbers prove that the A7-like structure is almost destroyed in liquid Ni2Sb98 alloy. This research is aim to provide new insight into the structure evolution of liquid alloys during the cooling process.
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