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Microstructure and Strain Fatigue Dislocation Structure of 7075-RRA Aluminum Alloy

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Rare metals 2001年第1期20卷 52-57页

作者： Yunqing Li (Department of Planning and Developmet, State Nonferrous metals industry Administration, Beijing 100814, China) State Nonferrous met ind Adm Dept Planning & Dev Beijing 100814 Peoples R China

The microstructure and the strain fatigue dislocation substructure of 7075-RRA (Retrogression and Reaging) aluminum alloy have been studied by using transmission electron microscopy. From these, a competitive mechanism of cyclic microscopic softening/hardening is put forward to explain the relation between macroscopic cyclic stability behavior and microscopic substructure.

关键词： fatigue dislocation slip band aluminum alloy electron microscopic analysis

Galvanic effects on electrochemical behaviors of bare surface of 304 stainless steel

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中国有色金属学会会刊：英文版 2000年第2期10卷 253-256页

作者：孙冬柏李涛俞宏英杨德钧 Univ Sci & Technol Beijing Dept Surface Sci & Corros Engn Beijing 100083 Peoples R China minist met ind China Corros Eros & Surface Technol Lab Beijing 100083 Peoples R China

The bare surface of 304 stainless steel is produced by the fast fracture method. The influence of the surface galvanic cell on the electrochemical behaviors of bare surface of 304 stainless steel has been investigated in H 2SO 4 solutions with different concentrations. The results show that the solution corrosivity level and the area ratio influence the surface galvanic effects caused by the inhomogeneity between the free film surface of alloy and the passive surface. The surface galvanic effects can speed up the dissolution rate of the bare surface of the alloy and will change the electrochemical behavior of bare surface. With the increase of the area ratio between passive surface and fractured surface, the galvanic potential becomes more positive and, in the range of passive potential, both galvanic current and the peak fracture current increase evidently.

关键词： stainless steel alloy galvanic effect electrochemistry

FEATURES　OF　ANNEALING　MICROSTRUCTURE　AND　TEXTURE　IN　Ti－25Al－10Nb－3V－1Mo　SHEET

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中国有色金属学会会刊：英文版 1996年第2期6卷 67-71页

作者： Mao, WM Yu, YN Yang, H Song, B Zou, DX Wang, B UNIV SCI & TECHNOL BEIJING DEPT MAT SCI & ENGNBEIJING 100083PEOPLES R CHINA minist met ind DEPT SUPERALLOYCENT IRON & STEEL RES INSTBEIJING 100081PEOPLES R CHINA

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关键词： Ti-25-A1-10Nb-3V-1Mo texture rolling deformation annealing

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 Cent Iron & Steel Res Inst Welding Res Dept Beijing 100081 Peoples R China State Adm met ind Beijing 100711 Peoples R 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

INFLUENCE OF AGING ON LOW CYCLE FATIGUE BEHAVIOR IN 8090 Al-Li ALLOY

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中国有色金属学会会刊：英文版 1995年第1期5卷 80-83页

作者： Ai Suohua Wang Zhongguang Zhang Yun(State Key Laboratory of Fatigue and Fracture for Materials ,Institute of metal Research , Academia Sinica, Shenyang 110015) Han Xinglin Wu Yaqiao (Shenyang industrial University, Shenyang 110023) ACAD SINICA INST MET RESSTATE KEY LAB FATIGUE & FRACTURE MATSHENYANG 110015PEOPLES R CHINA SHENYANG ind UNIV SHENYANG 110023PEOPLES R CHINA

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关键词： low cycle fatigue cyclic hardening precipilate phase

Influence of metal cations on cassiterite flotation

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中国有色金属学会会刊：英文版 2000年第1期10卷 98-101页

作者：曾清华赵宏王淀佐 Univ New S Wales Sch Mat Sci & Engn Sydney NSW 2052 Australia Beijing Coll Light ind Educ Adm Dept Beijing 100037 Peoples R China Gen Res Inst NonFerrous met Beijing 100088 Peoples R China

Flotation of cassiterite has been studied on pure minerals performed in a microflotation cell with various collectors. The results indicate that sulphosuccinamate demonstrates strong collection, good selectivity on cassiterite in the region around pH 6, and that lead ions have certain activation whereas other ions such as ferric, aluminum, manganese, ferrous, calcium have strong depression on cassiterite flotation. In addition, X ray photoelectron spectroscopy (XPS) was applied to study the flotation systems of cassiterite sulphosuccinamate in the presence and absence of metal cation, and a chemisorption mechanism through chemically bonding between stannum species on the cassiterite surface and oxygen from sulphosuccinamate is proposed. The chemical environment of stannum species would be changed in the presence of lead ions in the flotation systems and therefore improve the activity of the stannum species, while ferric ions show strong depression due to the formation of steady complexes between ferric species and collector.

关键词： cassiterite flotation sulphosuccinamate tin

Chemical activation of phosphogypsum exhibits enhanced adsorption of malachite green from aqueous solution due to porosity refinement

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第11期18卷 124-124页

作者： Panda, Anurag Upadhyaya, Anuradha Kumar, Ramesh Acooli, Argha Banerjee, Shirsendu Mishra, Amrita Khan, Moonis Ali Chowdhury, Somnath Jeon, Byong-Hun Chakrabortty, Sankha Tripathy, Suraj K. Kalinga Inst ind Technol Sch Chem Technol Bhubaneswar 751024 India Hanyang Univ Dept Earth Resources & Environm Engn Seoul 04763 South Korea Kalinga Inst ind Technol Sch Biotechnol Bhubaneswar 751024 India King Saud Univ Coll Sci Dept Chem Riyadh 11451 Saudi Arabia Natl Inst Technol Dept Chem Engn Durgapur 713209 W Bengal India

Owing to its uncomplicated synthetic methodology and exorbitant market demand, malachite green is widely used in numerous industries, particularly as a fungicide in aquaculture. Considering its intrinsic toxicity and potential long-term health impacts, deployable and cost-effective strategies must be developed for eliminating water-soluble malachite green. In this study, chemically activated phosphogypsum, a byproduct of fertilizer production, was used to remove malachite green from an aqueous system. Due to its low cost and abundance, the use of phosphogypsum as a sorbent material may significantly reduce the cost of adsorption-based processes. Moreover, its structural durability allows efficient recycling without significant deformation during reactivation. However, untreated phosphogypsum exhibits minimal efficiency in adsorbing synthetic dyes due to its unfavorable surface chemistry. Our investigation revealed that Zn activation induced a noticeable increase in pore volume from 0.03 to 0.06 cm3g-1. A 60 mgL-1 sorbent dose, pH 7, 150 rmin-1, and operational temperature of 30 degrees C produced 99% quantitative sorption efficiency. Response surface methodology and artificial neural network were used to optimize process parameters by validating experimental values. No detectable toxicity was observed in Escherichia coli when exposed to the treated water.

关键词： malachite green operating conditions optimization phosphogypsum sorption water treatment

Preparation of colloidal gold immunochromatography strip for detection of methamidophos residue

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Journal of Environmental Sciences 2008年第11期20卷 1392-1397页

作者： Shi Chenggang Zhao Suqing Zhang Kun Hong Guobao Zhu Zhenyu Guangdong Univ Technol Fac Chem Engn & Light Ind Dept Pharm Engn Guangzhou 510006 Peoples R China Sun Yat Sen Univ Med Sci Affiliated Hosp 3 Guangzhou 510630 Peoples R China Guangxi Inst Bot Guilin 541006 Peoples R China Sun Yat Sen Univ Zhongshan Med Coll Dept Biochem Guangzhou 510080 Peoples R China Acad Sinica Guilin 541006 Peoples R China

methamidophos (met) is a broad spectrum organophosphorus insecticide and *** a trace of its residue is harmful to humans and many *** this study,the synthesis and identification of colloidal gold particles and antibody-colloidal gold conjugates were performed,and the preparation of colloidal gold immunochromatography strip was conducted for detection of met *** size of colloidal gold particles was checked using a transmission electron microscope (TEM).The formation of antibody-coll...

关键词： colloidal gold immunochromatography methamidophos (met)