材料期刊网

GROWTH MECHANISM OF TiC WHISKERS PREMRED BY A MODIFIED CHEMICAL VAPOR DEPOSITION METHOD

J.S. Pan and Y. W. Yuan (Department of Materials Science and Engineering , Tsinghua Universityt Beijing 100084 , China)(Department of Materials Science and Engineering , Tsinghua Universityt Beijing 100084 , China)

金属学报(英文版)

High quality TiC whiskers have been prepared by a modified chemical vapor deposition (CVD) method using TiCl4 and CH4 as reactant gases and Ni as substrate. The deposition temperature and gas flow mies have ampreciable effect on the whisker growth.The whisker orientations and morphology are determined by X-my diffraction (XRD),scanning electron micmpmph (SEM) and transmission electron microgmph (TEM).In addition to the spherical tips, spiral growth microsteps and obvious terraces are observed at the tips and side faces of whiskers in the present eoperiment. The whiskers grow mostly along (100) direction. The whisker growth mechanism is discussed in detail.

关键词: TiC; whisker; chemical vapor deposition (CVD); growth mechanism

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英文）

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A simulation study of Tsinghua Thomson scattering X-ray source

中国物理C

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RF deflecting cavity design for bunch length measurement of photoinjector at Tsinghua University

中国物理C

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Design of an MeV ultra-fast electron diffraction experiment at Tsinghua university

中国物理C

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Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

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Towards the ultimate storage ring: The lattice design for Beijing Advanced Photon Source

中国物理C doi:10.1088/1674-1137/37/5/057003

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CORRELATION BETWEEN STRESS COMPONENTS AND STRESS CORROSION CRACKS IN BRASS Lecturer,Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China

QIAO Lijie LIU Rui XIAO Jimei University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The effects of stress components on nucleation sites and propagation directions of stress cor- rosion cracks in brass were investigated with specimens under mode Ⅱ and mode Ⅲ loadings. The results indicated that under mode Ⅱ loading,stress corrosion cracks nucleated on the site with maximum normal stress component and propagated along the plane perpendieular to the maximum normal stress,under mode Ⅲ loading,the stress corrosion crack was not evident on the 45°plane due to the general corrosion in aqueous solution with high NH_4OH concentra- tion,while stress corroded in aqueous solution with low NH_4OH concentration, numerous cracks with spacings of 10—150μm were found on the 45°plane with maximum normal stress and no stress corrosion cracks was observed on the plane with maximum shear stress.

关键词: stress corrosion cracking , null , null , null

RF deflecting cavity for bunch length measurement in Tsinghua Thomson scattering X-ray source

中国物理C

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TW Laser system for Thomson scattering X-ray light source at Tsinghua University

中国物理C

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