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Search Results: 1 - 10 of 104147 matches for " Zhuangqi HU Hongbo LIU "
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Comparative Study of Bond Orientational Order and Pair Analysis in Describing Local Symmetry in Liquid Metals
Comparative Study of Bond Orientational Order and Pair Analysisin Describing Local Symmetry in Liquid Metals

Kuiying CHEN,Hongbo LIU,Zhuangqi HU,

材料科学技术学报 , 1995,
Abstract: The similarity and difference between the bond orientational order and pair analysis methods have been first identified with the help of molecular dynamics simulation and the steepest descent minimization of potentials techniques. The binary liquid K-Rb alloys are chosen as an example.Results show that the bond orientational order parameters may be a relevant direct measurement on the perfection of an icosahedron. The PA formula (1551 bonded pairs) is, however, responsible for the total number of various icosahedra. In addition, it is found that pair analysis approach is more sensible to local structure than that for bond orientational order.
Structure in Binary Liquid Li-Mg Alloys
Kuiying CHEN,Zhuangqi HU Hongbo LIU,

材料科学技术学报 , 1996,
Abstract:
LOCAL STRUCTURE OF SUPERCOOLED LIQUID Ni_(80)P_(20) ALLOY
CHEN Kuiying,LIU Hongbo,HU Zhuangqi LI Qingchun,
CHEN Kuiying
,LIU Hongbo,HU Zhuangqi

金属学报(英文版) , 1995,
Abstract: Local arrangement of atoms in supercooled liquid Ni_(80)P_(20) alloy has been investigated by using NPT-MD simulation techniques based on the effective pair Potentials derived for Ni-P system. Bond-orientational order, the long-range correlation function and symmetrical parameters by pair-analysis approach have been calculated for supercooled liquid Ni_(80)P_(20) alloy. Results show. that in case of Ni_(80) .P_(20) alloy, the local structure is all random-like whether the centre of cluster is located at atoms Ni or P. It indicates that the icosahedral symmetry is not the unique model to describe the microstructure in supercooled liquid metals.
Application of the Embedded-atom Method to Liquid Binary Cu-Ni Alloys
Hongbo LIU,Kuiying CHEN,Zhuangqi HU Geying AN,

材料科学技术学报 , 1997,
Abstract:
MOLECULAR DYNAMICS SIMULATION OF RAPID SOLIDIFICATION PROCESS FOR Al BY USING EAM
基于镶嵌原子势的纯Al快速凝固过程分子动力学模型

LI Xiaoping,HAN Qiyong LIU Hongbo,CHEN Kuiying,HU Zhuangqi,
李小平
,韩其勇,刘洪波,陈魁英,胡壮麒

材料研究学报 , 1996,
Abstract: EAM together with MD has been applied to the investigation of rapid solidification process of pure Al. The structures of pure Al in liquid state, supercoolled liquid state and noncrystalline. The evaluation of structures have been examined by using bond o
PHASE STRUCTURE TRANSITION OF LIQUID COPPER DURING RAPID COOLING BY MD SIMULATION
快速凝固过程中纯铜相结构转变的分子动力学模拟

LI Xiaoping,HAN Qiyong,LIU Hongbo,CHEN Kuiying,HU Zhuangqi,
李小平
,韩其勇,刘洪波,陈魁英,胡壮麒

金属学报 , 1995,
Abstract: The structural characteristics of liquid Cu and structural evolution during rapid cooling have been simulated by MD technique. EAM was used as many-body interaction.Bond orientational order parameters and pair analysis technique were applied to detect the microstructure of liquid, supercooled liquid. non- crystalline and crystalline states. It was shown that EAM is able to describe the complicated disorder system. The calculated pair distribution function was almost the same as the experimental result.The calculated critical point of non-crystalline transition was in reasonable agreement with theoretical value
Strong Convergence Results for Hierarchical Circularly Iterative Method about Hierarchical Circularly Optimization  [PDF]
Hongbo Liu
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.37079
Abstract:

An hierarchical circularly iterative method is introduced for solving a system of variational circularly inequalities with set of fixed points of strongly quasi-nonexpansive mapping problems in this paper. Under some suitable conditions, strong convergence results for the hierarchical circularly iterative sequence are proved in the setting of Hilbert spaces. Our scheme can be regarded as a more general variant of the algorithm proposed by Maingé.

Consolidation and Compression Property of Nanocrystalline NiAl Synthesized by Mechanical Alloying
Zhiguang LIU,Jianting GUO,Nanlin SHI,Zhuangqi HU,

材料科学技术学报 , 1996,
Abstract: The mixture of pure nickel and aluminum powders in the composition of Ni50AI50 was subjected to high energy ball milling. The high energy ball milling to 30 h resulted in the formation of a nanocrystalline NiAl with a grain size of about 10 nm. The as-milled NiAl powder was hot-pressed and the compact with a density of 90% was obtained. It was showed that heating to900℃ and holding for more than 2 h failed to induce the coarsening of the fine nanocrystalin the material, the tendency of grain growth was weak. Compression testing showed that thecompression ductility at room temperature reached about 7%. The ductility increased with theexperimental temperature while the strength decreased drastically at elevated temperature.
Morphology Characteristics of Nd-rich Phase Particles in Melt-quenched Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Alloy
Geping LI,Dong LI,Yuyin LIU,Zhuangqi HU,

材料科学技术学报 , 1995,
Abstract: The morphology of the melt-equenched Ti-5Al-4Sn-2Zr-1Mo-9.25Si-1Nd alloy is uniformly distributed Nd-rich phase particles in matrix. The particles within grains are spherical, and the particles at grain boundaries are elliptical. The Nd-rich phase particle calculated is 6.6 nm in diameter, which is within the 6-15 nm range of average particle diameter experimentally ob served in the alloy The practical interfsce velocity (0.5 m/s) is much greater than the critical velocity (0.15 m/s), hence the Nd-rich phase particles are trapped by the liquid-solid interface
ANALYSIS OF FLUID FIELD OF LIQUID METAL IN ELECTROMAGNETIC CENTRIFUGAL CASTING
JIAO Yuning,LIU Qingmin,YANG Yuangsheng,HU Zhuangqi,

金属学报(英文版) , 1994,
Abstract: Navier-Stokes equation and Lorentz force equation are used to calculate the fluid field of liquid metal of electromagnetic centrifugal casting (EMCC) in this paper. A field equation is given, which shows the azimuthal velocity closely relates to electrical conductivity, magnetic density, viscosity of liquid metal and radius of casting. The results show that the stationary magnetic field can effectively restrain the fluid flow and the relative velocity between liquid metal and casting mould and the velocity gradient at solid / liquid interface increases with rising magnetic density, which has a great effect on the solidification of liquid metal and crystal growth characteristics.
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