材料期刊网

EFFECT OF WELDING THERMAL CYCLE ON THE MICROSTRUCTURE AND TOUGHNESS OF LOW ALLOY HIGH STRENGTH STEEL

C.S.Hu1 , 2) and Y.X.Gu3) 1) Department of Mechanical Engineering , Fushun Petroleum Institute , Fushun 113001 , China 2) State Key Laboratory for Corrosion and Protection , Institute of Corrosion and Protection of Metal , The Chi nese Academy of Science , Shenyang 110015 , China 3) Departmentof Materials Scienceand Engineering , Shenyang Polytechnic University , Shenyang 110023 , China

金属学报(英文版)

Weldingthermalcyclicsimulated techniquesisemployed in thestudy. By meansof analysismetalloscope, fracture morphology and impact toughness test of the sample, the effect ofweldingthermalcycle peak temperature and dualthermal cycle on the micro structure and toughnessoflow alloy high strength steel HQ100 isinvestigated.Inner fine martensitic andbainitic microstrctureisobservedby TEM.Theresultsshow that withtheincreaseof peaktem perature, grain sizesbecomelarger,theimpacttoughness drop down .Ifthermalcycleisim posed twiceand dualthermalcyclicpeaktemperatureis1275 ℃+ 750 ℃,theimpacttoughnessisatthelowest value.Alsotheimpacttoughnessagrees withthefracture morphology.

关键词: thermalcycle , null , null , null

Studies of the anion position parameter chi of the ternary semiconductor CuGaS2 by use of Ni+ ion probe

Materials Science and Engineering B-Solid State Materials for Advanced Technology

The anion position parameter chi of NiS4 cluster formed in the ternary semiconductor CuGaS2 by substitution of Ni+ for Cu+ has been determined by studying the optical spectra and EPR data for CuGaS2:Ni+. The result (chi approximate to 0.263(1)) is consistent with the mean value of the X-ray measurement results reported in two groups of references and also with the calculated value obtained from the conservation of tetrahedral bonds (CTB) plus eta = eta(tet) rule (where eta = c/2a). So, we suggest that the anion position parameter chi in pure CuGaS2 crystal is close to the above value obtained by use of Ni+ ion probe. The optical absorption bands and g factors g(parallel to), g(perpendicular to), of CuGaS2: Ni+ are therefore explained reasonably from the anion position parameter. (C) 2003 Elsevier B.V. All rights reserved.

关键词: structural parameter;electron paramagnetic resonance (EPR);optical;spectrum crystal-field theory;CuGaS2;Ni+;chalcopyrite semiconductors;superposition model;crystal

Stereology in Materials Science

LIU Guoquan Department of Materials Science and Engineering , University of Science and Technology Beijing , 100083 , China.

材料科学技术（英文）

Quantitative analysis of populations having a geometric structure,which has developed into a special scientific subject called microstructology or stereology,is of great importance to the characterization and evaluation of microstructures and their evolution in various processes.This paper, besides a brief discussion on those topics such as the recent developments of computer assisted image analysis,mathematical morphology,and fractal analysis,will mainly focus on the scope,fundamen- tals,present status,and perspectives of classical stereology.Several case examples of its application to materials science will also be given.

关键词: stereology , null , null , null

Laser-Heated Diamond-Anvil Cell (LHDAC) in Materials Science Research

N.V.Ch , ra Shekar , P.Ch.Sahu , K.Govinda Rajan

材料科学技术（英文）

Laser-heated diamond-anvil cell (LHDAC) is emerging as the most suitable, economical and versatile tool for the measurement of a large spectrum of physical properties of materials under extreme pressure and temperature conditions. In this review, the recent developments in the instrumentation, pressure and temperature measurement techniques, results of experimental investigations from the literature were discussed. Also, the future scope of the technique in various avenues of science was explored.

关键词: Laser heating , null , null , null

CURRENT STATUS OF HIGH-RESOLUTION ELECTRON-MICROSCOPY AND ITS APPLICATIONS TO MATERIALS SCIENCE AND CONDENSED MATTER PHYSICS

材料科学技术（英文）

The present paper summarizes the current status of high resolution elect;on 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.

关键词: juxtaposed pentagonal antiprisms;two-dimensional quasicrystal;domain;boundary structures;close-packed phases;nanocrystalline materials;crystal-structure;copper oxidation;initial-stage;translational;symmetry;rotational symmetry

Current Status of High Resolution Electron Microscopy and Its Applications to Materials Science and Condensed Matter Physics

Douxing LI and Hengqiang YE (Laboratory of Atomic imaging of Solids , Institute of Metal Research , Chinese Academy of Sciences , Shenyang , 110015 , China)

材料科学技术（英文）

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.

关键词:

Guangzhou Institute of Energy Conversion,The Chinese Academy of Sciences,Guangzhou 510070,China

B.W. Wang , H. Shen

金属学报(英文版)

Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.

关键词: solar selective thin film , null , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

关键词:

The Coming of Materials Science

材料科学技术（英文）

关键词:

The Abstracts of Papers in Special Issue on the Seventh Five Year Project for Rare Earths of Chinese Academy of Sciences(in Chinese)

熊炳昆

中国稀土学报

关键词: