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Search Results: 1 - 10 of 126969 matches for " Li Douxing "
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Current Status of High Resolution Electron Microscopy and Its Applications to Materials Science and Condensed Matter Physics
Current Status of High Resolution Electron Microscopyand Its Applications to Materials Science and Condensed Matter Physics

Douxing LI,Hengqiang YE,

材料科学技术学报 , 1995,
Abstract: The present paper summarizes the current status of high resolution electron microscopy (HREM)and the applications of HREM to materials science and condensed matter physics. This review recounts the latest development of high resolution electron microscope, progress of HREM and the applications of HREM, including the crystal structure determination of microcrystalline materials and characterization of the local structure of the defects and nanostructured materials as well as qualitative and quantitative analysis of the grain boundaries, interfaces and interfacial reactions in the advanced materials by means of HREM in combination with electron diffraction,subnanometer level analysis, image simulation and image processing.
AN ELECTRON DIFFRACTION ANALYSIS OF PRECIPITATES IN A 13Ni MARAGING STEEL (280kgf/mm~2)

Li Douxing,Ye Hengqiang,

金属学报 , 1981,
Abstract:
DEVELOPMENT OF HIGH RESOLUTION QUANTITATIVE ELECTRON MICROSCOPY AND ITS APPLICATIONS TO MATERIAL SCIENCE
高分辨率定量电子显微学的发展及其在材料科学中的应用

LI Douxing,
李斗星

材料研究学报 , 1998,
Abstract: This article summarizes the current and future trends of the development of electron microscope,related technique and high resolution quantitative electron microscopy The importance of the studies of structures and defects in materials by combining direct observation at atomic scale and computer simulation, and the fundamental effects on experimental results measured by quantitative high resolution electron microscopy are discussed, such as three-fold astigmatism, coma and thin-foil geometries.
TOPOLOGICALLY CLOSE-PACKED PHASES IN SUPERALLOYS: New Phases and Domain Structures

YE Hengqiang,LI Douxing,GUO Kexin,

金属学报 , 1986,
Abstract:
Long Periodic Structure in ZrO2-Y2O3 Ceramics
Long Periodic Structure in ZrO_2-Y_2O_3 Ceramics

Jiancun RAO,Yu ZHOU,Douxing LI,
Jiancun RAO
,Yu ZHOU and Douxing LI

材料科学技术学报 , 2004,
Abstract: A new type of long periodic structure has been found in ZrO2-Y2O3 ceramics in annealed states. High resolution electron microscopy (HREM), selected area electron diffraction, and computer simulation have been used to reveal the presence of the long periodic structure. The unit cell of the long periodic structure consists of a cubic ZrO2 unit cell and L1o-like phase one.
Microstructure of TiB Whisker Reinforced Ti Matrix Composite
Yuxiong LU,Douxing LI,Dehai PING,Jing BI,Zongyi MA,

材料科学技术学报 , 1997,
Abstract: The composite of Ti matrix with TiB whisker reinforcement has been successfully fabricated. The content of TiB whisker in Ti matrix can reach about 30 vol. pct. Metallographic examination,morphology and microstructure of TiB whisker, interface structure between TiB whisker and Ti matrix were investigated using optical microscope, SEM, TEM and HREM technology. The diameter distribution of TiB whisker is from 0. 1 μm to 3.5 μm and the aspect ratio of TiB whisker is from 10 to 20. The cross-section of whisker is generally polygon. Because of good compatibility between TiB whisler and Ti matrix it is identified that there is no obvious interaction of Ti matrix with Ti B reinforcement and TiB whisker reinforced Ti matrix composites have excellent elevated properties.
Molecular Dynamic Simulation of Lattice Distortion Region Produced by Rounded Grain Boundary in Nanocrystalline Materials
Xiaowei WANG,Jingyang WANG,Douxing LI,JRifkin,
XiaoweiWANG
,J.Rifkin

材料科学技术学报 , 2002,
Abstract: The distortion structure in nanocrystalline NiAl is studied using molecular dynamics simulation. The rounded grain boundaries in these nanograins are a direct source for the observed lattice distortion. The change of grain size affects directly the volume fraction of the distorted lattice in the nanograin.
Molecular Dynamics Study of Grain-Boundary-Induced Melting in B2 NiAl Using a Many-body Potential
Molecular Dynamics Study of Grain-Boundary-Induced Meltingin B2 NiAl Using a Many-body Potential

Shijin ZHAO,Douxing LI,Shaoqing WANG,Lianlong HE,Hengqiang YE,Jianqiang YOU,Qibin YANG,

材料科学技术学报 , 1999,
Abstract: The role of grain-boundary (GB) in the melting for =5 bicrystals of B2 NiAl is investigated by molecular-dynamics simulation. The thermodynamic properties of the boundary are monitored over a wide temperature range including the thermodynamic melting point Tm, which is determined by using a many-body potential fitted to NiAl. A thermal disorder transition in the GB region occurs well below the melting point. Our results indicate that such a transition is a continuous process and there is no evidence of premelting, which is entirely in accord with experimental results and theoretical prediction. Moreover, we also find that the superheated temperature range of this intermetallic alloy is much wider than that of some elemental metals.
Microstructural Characteristics of La0.7Ca0.3MnO3 Films and Multilayers
Microstructural Characteristics of La_(0.7)Ca_(0.3)MnO_3 Films and Multilayers

Mingguang WANG,Douxing LI,Lianlong HE,Hengqiang YE,Guangcheng XIONG,

材料科学技术学报 , 2000,
Abstract: La0.7Ca0.3MnO3 (LCMO) films and La0.7Ca0.3MnO3/Gd0.7Ca0.3MnO3 (LCMO/GCMO) multilayers have been prepared by pulsed laser deposition. The microstructures of both systems were investigated by transmission electron microscopy (TEM). The main structure of the films and the multilayers was monoclinic with a unit cell of size 2a(p) x root 2a(p) x root 2a(p), where a(p) is the lattice constant of single perovskite crystal. The LCMO films were composed of three-dimension multitwinning domains, while the LCMO/GCMO multilayers showed two-domain structure. In LCMO/GCMO multilayers, LCMO layers were coherent with GCMO layers and the interfaces between LCMO and GCMO layers were free from mismatch dislocation, which resulted in highly strained multilayerd structures.
FINE STRUCTURE OF BOTH INTERFACES AND INTERFACIAL REACTION PRODUCTS
界面精细结构与界面反应产物结构

LI Douxing,PING Dehai,NING Xiaoguang,YE Hengqiang,
李斗星
,平德海,宁小光,叶恒强

金属学报 , 1992,
Abstract: Recent studies by the authors are reviewed of the fine structure of both the materials interfaces and the interfacial reaction products in semiconductor superlattice, metal multilayer, ceramics and composite materials by means of selected area electron diffraction patterns and high-resolution electron microscopy. Analysis and discussion in details are presented concerning the orientation relationships, the characterization of steps, facets and roughness of interfaces, atomic bonding across interface, the degree of coherency, the structure of misfit dislocation and elastic strain relaxations at interface, the presence of defects at interface, the strure of interfacial reaction products, and the reaction kinetics and mechanism.
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