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Laser cladded AlCuFe+Sn quasicrystalline composite coatings

中国有色金属学会会刊：英文版 2005年第2期15卷 432-436页

作者：冯莉萍邵天敏金永吉 E.Fleury D.H.Kim 陈大融魏悦广 State Key Laboratory of Tribology Tsinghua University Beijing 100084 China State Key Laboratory of Non-Linearity Mechanics Insititute of Mechanics Chinese Academy of Sciences Beijing 100080 China Korea Institute of Science and Technology Seoul 130-650 Korea center for noncrystalline materials Yonsei University Seoul 120-749 Korea

Al-Cu-Fe+Sn quasicrystalline(QC) composite coatings with different volume fractions of Sn, i.e.(12%,) (20%) (and 30%,) were prepared by laser cladding technique. The effects of soft phase Sn and processing parameters on the microstructure, microhardness and frictional behavior of the coatings were investigated. The results show that after laser cladding, i-phase existing in the powder is decomposed and element Sn reacts with Cu, forming β-CuSn. The volume fraction of Sn addition has less obvious effect on the microstructure, microhardness and friction performance than that of plasma sprayed coatings. The best performance in terms of microhardness and friction are (obtained) for the coating containing 20% Sn additions prepared with the laser power of 950 W and scanning velocity of 3 mm/s.

关键词：激光覆层电镀工艺铝铜铁锡复合材料摩擦性质

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Microstructure and texture evolution of cold drawing <110> single crystal copper

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Science China(Technological Sciences) 2011年第6期54卷 1551-1559页

作者： CHEN Jian YAN Wen LI Bing MA XiaoGuang DU XinZhi FAN XinHui Department of Applied Physics Northwestern Polytechical University Xi'an 710072 China School of materials Science and Chemical Engineering Xi'an Technological University Xi'an 710032 China

By means of electron backscattering diffraction and transmission electron microscopy the microstructure and texture of drawn single crystal copper with initial orientation （110） parallel to axial direction have been investigated in the present work. In or- der to analyze the effect of initial orientation on microstructure and texture of drawn copper, the results of the drawn （110） sin- gle crystal copper wires have been compared with （100） and （111） single crystal copper wires. It is found that the grain subdi- vision of （110） single crystal is more evident than that of （100） and （111）, and the textures consisting of （111） and （100） abruptly form in the drawn （110） single crystal. At high strains, due to shear strain, the distribution of fiber textures is imho- mogenous along the radial direction of drawn （110） single crystal copper wires. （100） is near the surface and （111） is at the center. The microstructure results of drawn （110） single crystal show that at low strains, it can be characterized as two kinds of geometrically necessary boundaries with noncrystalline character. At medium strains, S bands can be observed. At high strains, lamellar boundaries form. Mean misofientation and average spacing of dislocation boundary are larger in drawn （110） single crystal, as compared with （111） and （100）. In drawn （110） single crystal with high strains, the bimodal distribution forms at lower strains than in drawn （100） single crystal, which is because the dislocation boundaries with high angle are contributed by not only the boundary between （111） and （100） fiber textures but also the boundary in （111） or （100） texture.

关键词： single crystal copper cold drawing texture microstructure

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The structures of noncrystalline rocks

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Chinese Science Bulletin 2000年第9期45卷 838-841页

作者： CHEN Jizhou WANG Junqiao Bl Yurun LIU Pingan Institute of Material Physics Tianjin Institute of TechnologyTianjin 300191China Department of Geology Peking UniversityBeijing 100871China Chinese National Analytical center Guangzhou 510070China

The structural studies of noncrystalline rocks by total radial distribution function (RDF) which was derived from the wide angular X-ray scattering (WAXS) have been reported. In order to make a further study of the structural features shown by RDF, the unsymmetric peaks in total RDF were separated into the approximately symmetric peaks by the multi-peaks separation processing. By analyzing the relationship of the peak parameters with the compositions, the information of further structures has been discussed.

关键词： noncrystalline rock radial distribution function wide angular X-ray scattering.

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Multi-photon Up-conversion Luminescence of ErP_(5)O_(14) noncrystalline

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Chinese Physics Letters 1993年第4期10卷 242-244页

作者： CHEN Xiaobo ZHANG Guangyin WANG Hong LIU Yanbin LI Jiaji CHEN Jinkai ZHANG Wanlin SHANG Meiru Department of Physics Nankai UniversityTianjin 300071 Department of Physics Tianjin Education CollegeTianjin 300020 Research Institute of Artificial Crystalline Beijing 100018 Experiment center Fujian Normal UniversityFuzhou 350007

In this paper we report the observation of multi-photon up-conversion luminescence phenomenon of ErP_(5)O_(14) noncrystalline induced by pulse DCM dye laser and clarify that the mechanism of up-conversion is the step ... 详细信息

关键词： photon luminescence

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