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EFFECT OF OXIDE LAYER THICKNESS OVER Al AND Al ALLOY POWDERS ON QUALITY OF THEIR EXPLOSIVE COMPACTS

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Acta Metallurgica Sinica(English Letters) 1993年第7期6卷 25-28页

作者： ZHANG Dengxia MA Chenghui CAI Ming institute of Mechanics,Academia Sinica,beijing,chinaAI Baoren ZHANC Jinyuan ZHU Ruizhen LIU Chunlan central iron and steel research institute,ministry of metallurgical industry,beijing,china Associate Professor,institute of Mechanics,Academia Sinica,beijing 100080,china

Observations of microstructure of explosive compacts made of Al or Al-Li alloy powders by atomization with water,nitrogen or ultrasoic Ar gas were carried out under optical and scanning electron *** rsults indicate that super quality explosive compact can only be obtained by powders of which the thickness of the oxide layer is less than 30 nm.

关键词： Al powder Al-Li alloy powder explosive compact oxide layer

用Judd-Ofelt理论计算Na_5Tm(WO_4)_4晶体中Tm^(3+)的光谱参数

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中国稀土学报 1997年第1期15卷 6-10页

作者：姚连增张海峰中国科学技术大学材料科学与工程系冶金部钢铁研究总院

在已获得的Ｔｍ３＋在Ｎａ５Ｔｍ（ＷＯ４）４晶体中强度参数Ωλ（λ＝２，４，６）基础之上，根据ＪｕｄｄＯｆｅｌｔ理论计算Ｔｍ３＋多重激发态之间的辐射跃迁几率、辐射寿命、荧光分支比及积分发射截面等光谱参数。

关键词：钨酸铥钠铥积分发射截在光谱参数激光晶体

Thermodynamics of Cu-Ce-M(M=Sn,Zn,Pb)liquid solutions

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中国有色金属学会会刊：英文版 1994年第3期4卷 17-20页

作者： Du, Ting Li, Guodong(central iron and steel research institute ministry of metallurgical industry ,beijing 100081)

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｃｅ－Ｍ（Ｍ＝Ｓｎ，Ｚｎ，Ｐｂ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳＤｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅＭｉｎ... 详细信息

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＣｕ－Ｃｅ－Ｍ（Ｍ＝Ｓｎ，Ｚｎ，Ｐｂ）ＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳＤｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅＭｉｎｉｓｔｒｙｏｆＭｅｔａｌｌｕｒｇｉ...

关键词： Cu-Ce-M(M=Sn Zn Pb) liquid solutions thermodynamic properties

Thermal Activation Analyses of Dynamic FractureToughness of High Strength Low Alloy steels

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Journal of Materials Science & Technology 2001年第2期17卷 215-218页

作者： Cunjian LI and Shaohua LI Welding research Department, central iron & steel research institute, beijing 100081, china Yuqing DENG State Administration of metallurgical industry, beijing 100711, china Dept. of Welding Res. Central Iron and Steel Res. Inst. Beijing 100081 China

A formula is derived for determining the influence of temperature and loading rate on dynamic fracture toughness of a high strength low alloy steel (HQ785C) from thermal activation analysis of the experimental results of three-point bend specimens as well as introducing an Arrhenius formula. It is shown that the results obtained by the given formula are in good agreement with the experimental ones in the thermal activation region. The present method is also valuable to describe the relationship between dynamic fracture toughness and temperature and loading rate of other high strength low alloy steels.

关键词： test GB Thermal Activation Analyses of Dynamic FractureToughness of High Strength Low Alloy steels

research progress in non-equilibrium grain-boundary segregation and intergranular embrittlement

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Progress in Natural Science:Materials International 2006年第2期16卷 109-119页

作者： XU Tingdong (central iron & steel research institute, beijing 100081, china) central iron and steel research institute Beijing 100081 China

This paper is a summary of the research progress made by the author in the study of non- equilibrium grain-boundary segregation and intergranular embrittlement during the last 20 years. Some new concepts and new model... 详细信息

关键词： grain-boundaries vacancies segregation embrittlement.

Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration

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Journal of Materials Science & Technology 2000年第5期16卷 466-470页

作者： Guangwei HAN and Di FENG (central iron & steel research institute, beijing 100081, china) central iron and steel research institute Beijing 100081 China

Investigation has been made on the process of synthesizing SiC/Al co-continuous composite by spontaneous melt infiltration. It is found that nitrogen atmosphere is an indispensable factor for spontaneous infiltration of melt Al into SiC preform with continuous porosity. The critical temperature for spontaneous infiltration occurrence can be lowered and spontaneous infiltration rate increased by doping a small amount of Mg into the Al alloy. Adding fine SiO2 powders into the ceramic preform can play the similar role as Mg-doping by increasing wetting through the chemical reaction of 3SiO2+4AI=2Al2O3+3Si at the infiltration front. Infiltration rate can also be increased by Si-doping to lower the viscosity of the molten Al alloy. In addition, sufficient Si content in the molten Al is also indispensable to avoid the formation of Al4C in the synthesized composite.

关键词： Co SiC Synthesis of SiC/Al Co-Continuous Composite by Spontaneous Melt Infiltration Al

Effects of Temperature and Disperse Phase of Disordered γ on Strain Hardening Rate of Ni_3Al

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Journal of Materials Science & Technology 1995年第6期11卷 403-408页

作者： Guangwei HAN Di FENG and Wujun YE (central iron and steel research institute, beijing, 100081, china) central iron and steel research Inst Beijing China

Investigations have been made on the effects of temperature and fine disperse phase of disordered γ on strain hardening rate of Ni3Al based alloy. The result is found that there exists a peak temperature for the strain hardening rate of Ni3Al based alloy below the peak temperature of its yield strength. Analysis shows that the appearance of the peak temperature of strain hardening rate is caused by both the decreasing of the movability of superdislocations on {111}slip plane and the increasing of the dynamic recovery in Ni3Al with increasing temperature. A Ni3Al based alloy hardened by disperse phase of disordered γ has been obtained by controlling chemical composition and treating processes. The peak temperature of strain hardening rate of this alloy is increased due to the fine disperse phase of disordered γ, which causes the reductions of the movability of the superdislocations and the dynamic recovery in Ni3Al

关键词： OO Al on Strain Hardening Rate of Ni3Al Ni

MICROSTRUCTURE OF SILICON CARBIDE WHISKERS

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Acta Metallurgica Sinica(English Letters) 1991年第9期4卷 211-218页

作者： XU Haigang ZHU Jing YUAN Hong central iron and steel research institute,ministry of metallurgical industry,beijing,chinaNING Xiaoguang YE Hengqiang Laboratory of Atomic Imaging of Solids,institute of Metal research,Academia Sinica,Shenyang,china central iron and steel research Inst Beijing China

The morphology,crystal defects and chemical compositions of surfaces in two kinds of SiC whiskers related to their growth mechanism have been studied by means of electron microscopy and surface chemical *** upon the experimental results,five criteria for evaluating the whisker microstructure were suggested as:proportion of the perfect single crystals,morphology and dimensions,defects and their distribution,the bulk and surface chemistries,and crystallographic characteristics.

关键词： SiC whisker microstructure defect

Development of Rapidly Quenched Soft Magnetic Materials in china

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Journal of Materials Science & Technology 2000年第2期16卷 131-136页

作者： Shaoxiong ZHOU (National Amorphous and Nanocrystalline Alloy Engineering research Center, central iron and steel research institute, beijing 100081, china) National Amorphous and Nanocrystalline Alloy Engineering research Center Central Iron and Steel Research Institute Beijing 100081 China

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in china is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

关键词： Development of Rapidly Quenched Soft Magnetic Materials in china