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Search Results: 1 - 10 of 27582 matches for " Zhuangqi HU "
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Nucleation in Metallic Melt on the Ground and underElevated Gravity
Nucleation in Metallic Melt on the Ground and under Elevated Gravity

Kuiying CHEN,Zhuangqi HU,Bingzhe DING,

材料科学技术学报 , 1994,
Abstract: The expressions for nucleation rate in metallic melt on the ground and under elevated gravity have been derived theoretically and the effects of gravity and elevated gravity on nucleation rate have been discussed. A comparison of nucleation rate under microgravity with those on the ground and under elevated gravity has also been made
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.
Mechanism of Macroalloying-induced Ductility in Ni_3Al
Changgong MENG,Jianting GUO,Zhuangqi HU,

材料科学技术学报 , 1994,
Abstract: The bonding characteristics of Ni3Al doped with ternary elements has been investigated by means of the discrete variational Xα (DV-Xα) cluster method. From the computations. the addition of ternary element M (M= Pd. Ag. Cu and Co) substituting for the Ni sttes leads to the increase of delocalized bonding electrons. and the mechanism of ductilization of Ni3Al bV doping with M is explained based on the analysis of bonding characteristics. The increase of delocalized bonding electrons lowers the covalent bond directionality and strengthens grain boundary. The difference of strength between M-Al bond and M-Ni bond is an important factor in the effect of alloy stoichiometry on ductility. The larger the difference. the more the sensitivity to the alloy stoichiometry
Substitution Behavior of Elements in CoZr-with Consideration of Lattice Relaxation
Dongsheng XU,Dong LI,Zhuangqi HU,

材料科学技术学报 , 1999,
Abstract: The substitution behavior of some alloying elements in CoZr is investigated using the discrete variational Xa cluster method. The method proposed by the author to predict the substitution behavior is amended to consider the local lattice relaxation. A diagram is drawn based on the binding energies of clusters with alloying elements taking either Co or Zr site. Two straight lines on the diagram separate the alloying elements into three groups with different substitution behavior. The elements above the upper line will take Zr sites and those below the lower line will take Co sites regardless of the composition. The substitution behavior of elements in between the two lines will be affected by the alloy composition. The concept of site competition and step ordering is proposed.
Crystallization Behaviour of Laser Synthesized Nanometric Amorphous Si_3N_4 Powders
Yali LI,Yong LIANG,Zhuangqi HU,

材料科学技术学报 , 1995,
Abstract: The crystallization behaviour of the laser synthesized nanometric amorphous Si3N4 powders with the particle size of 15 nm in diameter has been studied between 1200° and 1700℃ by XRD,TEM and FTIR techniques. A small amount of β-Si3N4 formed at 1250℃ and increased slowly until the α- β transformation happened at 1700℃, whereas α-Si3N4 appeared at 1300℃ andincreased rapidly between 1500-1600℃. The formation of β phase at the lower temperature was caused by the nitridation of free Si due to the preexisted β-nuclei in the Si3N4 particles, whereasthe α phase was formed by solid crystallization from the amorphous matrix. There were α and β SiC formed at 1700℃ due to the presence of Sio and Co gases in the system. FTIR analysis shows that two new IR absorption at 1356 and 1420 cm-1, and an overall strong absorption in wide wavenumber range resulted from the powders annealed at 1600 and 1700℃ respectively
Annealing Embrittlement in Fe-Mo-Si-B Amorphous Alloy
Jianmin LI,Mingxiu QUAN,Zhuangqi HU,

材料科学技术学报 , 1997,
Abstract: Annealing at Ta=200℃ or so, the enhancement in the average tensile fracture strength of as-quenched (Fe0.99Mo0.01)78Si9B13 metallic glass increases about 7~8%. The origin of the annealing embrittlement at 244℃ in the metallic glass (Fe0.99 Mo0.01)78Si9B13 was revealed that due to the formation of nanoscale granular with bcc structure resulting in the stress localization.The temperature of annealing embrittlement was in agreement with the calculated value from Tbcc=0.637Tc (Tc is the crystallized temperature), based on micromechanism of crystallization of metallic glass.
Structure in Binary Liquid Li-Mg Alloys
Kuiying CHEN,Zhuangqi HU Hongbo LIU,

材料科学技术学报 , 1996,
Abstract:
INFLUENCE OF PROLONGED AGING ON MICROSTPUCTURE AND MECHANICAL PROPERTIES OF K17G CAST Ni-BASE SUPERALLOY

WANG Sukun ZHANG Bingda HU Zhuangqi,

金属学报 , 1987,
Abstract:
MICROSTRUCTURE CHARACTERISTICS AND CRYSTALLOGRAPHIC ORIENTATION OF TRANSIENT LIQUID PHASE JOINT OF NI-BASE SINGLE CRYSTAL SUPERALLOY

LI Wen,JIN Tao,HU Zhuangqi,

金属学报 , 2008,
Abstract: The Ni-based single crystal superalloy was bonded by the transient liquid phase (TLP) bonding using Ni-15Cr-3.5B amorphous ribbon as an insert alloy. The microstructure characteristics in the joint during TLP process were evaluated by OM, SEM and TEM. The electron back scattering diffraction (EBSD) method was applied to determine the crystallographic orientation between the bonded interlayer and substrates. The results indicated that the joint consists of a bond, diffusion and base zones, in the meantime M23B6 +γ and MB+γ eutectics formed in the bond center and the fine M3B2 phases occurred in the diffusion zone. The γ' phases both in the bonded interlayer and in the superalloy substrate are almost identical after homogenization treatment. Due to the epitaxial growth of the isothermal solidification fronts from each mating surface, the crystallographic orientation between the bonded interlayer and the bonded substrate has a good match.
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.
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