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Journal of Materials Science & Technology 1994年第1期10卷 34-38页

作者： Shihong LI Ronghui ZHANG Shaoyun FU Xin CHEN and Benlian ZHOU(institute of Metal Research, Academia Sinica, shenyang, 110015, China)Qiyun ZENG(institute of Applied Ecology, Academia Sinica, shenyang, 110015, China) Inst of Metal Research Shengyang China

In thjs paper. bamboo fiber has been. on micro scale. investigated as a helical. multi-layered hollow cylinder, the stiffness featu res of bamboo bast fiber were compared with those of a multifilament yarn in traditional fiber-reinforced composite materials, Moreover. a biomimetic model of the reinforce ment of fiber-reinforced composite materials was proposed by imitating the fine structure of bamboo bast fiber. The results show that the comprehensive stiffness properties of the cornplicated fine struc ture of bamboo fiber is superior over those of traditional fiber-reinforced composites.

关键词： Cl A Biomimetic Model of Fiber-reinforced Composite Materials

Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy

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Journal of Materials Science & Technology 1995年第4期11卷 304-306页

作者： Lijian RONG Yiyi LI and Changxu SHI (institute of Metal Research, Chinese Academy of Sciences, shenyang, 110015, China) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The work-hardening behaviour in an Fe-Mn-Si-Cr-Ni alloy has been investigated using tensile test at different temperatures and TEM observation. It was found that besides the intersection of εmartensite, the intersections of ε martensite with stacking fault and the cross-slip of dislocation which is difficult to occur in the alloy with low stacking fault energy are also important factors to the temperature dependent work-hardening behaviour.

关键词： Work Mn Fe Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy Cr Si Ni

Rheological behaviour of semi-solid succinonitrile-camphor alloy

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Journal of University of Science and Technology Beijing 2003年第1期10卷 25-29页

作者： Zhenyao WangState Key Laboratory for Corrosion and Protection, institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, China Lab. for Corrosion and Protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Rheology experiments were carried out on succinonitrile-4% (mass fraction) camphor alloy, using a Haake VT550 viscometer. The results showed that the steady state viscosity of succinonitrile-4% camphor alloy in semi-solid process can be described well by the classical power law of viscosity versus shear rate, η= kγm, and the test method can be used to simulate the semi-solid processing for metals. The viscosity of the organic alloy decreases with increasing shear rate at a given temperature within liquid-solid range, and the viscosity of the organic alloy slurries increases with decreasing temperature, decreases with decreasing cooling rate. The structure and viscosity of organic alloy during solidification are strongly influenced by shear rate.

关键词： rheology semi-solid processing viscosity organic alloy microstructure

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

Performance comparison and parametric study on spiral groove gas film face seals

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Science China(Physics,Mechanics & Astronomy) 2004年第z1期47卷 29-36页

作者： LIU Yuchuan, SHEN Xinmin, XU Wanfu & WANG ZhiliState Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China School of Mechanical Engineering and automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China Lubrication Technology Research Center, shenyang institute of Technology, shenyang 110015, China Tsing Hua Univ State Key Lab Tribol Beijing 100084 Peoples R China Beijing Univ Aeronaut & Astronaut Sch Mech Engn & Automat Beijing 100083 Peoples R China shenyang Inst Technol Lubricat Technol Res Ctr Shenyang 110015 Peoples R China

Several spiral groove gas film face seals (SGFS) with different layouts are compared quantitatively to analyze their merits and faults and application behaviors. In addition, a parametric study on downstream mode SGFS is conducted to determine its optimal parameters under certain working conditions. In tne computation of gas film pressure on the face, finite element method (FEM) is applied to adapt to complicated geometrical boundary.

关键词： spiral groove, gas film face seals, parameter study, performance comparison, finite element method.

Unusual Behaviour of Dislocation Velocity Exponent in Dislocation Multiplication Model

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Journal of Materials Science & Technology 1998年第3期14卷 215-218页

作者： Xaowei WANG(International Centre for Materials Physics, institute of Metal Research, Chinese Academy of Sciences,shenyang 110015, China) International Centre for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The chaotic behaviour of dislocation multiplication process was investigated. The change of Lyapunov exponent which is used to determine the stability of quasi-periodic and chaotic behavior as well as that of equilibrium points, and periodic solution was reported by using an iteration model of dislocation multiplication. An unusual behavior of Lyapunov exponent and Feigenbaum exponent which respond to the geometric convergence of orbit from bifurcation to chaos was shown by dislocation velocity exponent m and there is a distinction on the tendency of convergence for the dislocation multiplication model when it was compared with logistic map. It is reasonable for the difference to be analyzed from the materials viewpoint. (Edited author abstract) 9 Refs.

关键词： Unusual Behaviour of Dislocation Velocity Exponent in Dislocation Multiplication Model

Research on a New Process of Preparation for Nano-SiO_2 with High Activity and Mesopores

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Journal of Materials Science & Technology 2004年第3期20卷 353-356页

作者： Ruijing ZHANG Ke YANG Tianyng XIONG institute of Metal Resarch,Chinese Academy of Sciences,shenyang 110016, China Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Nano-SiO_2 with high activity and mesopores was prepared through sol-gel synthesis followed by low-temperatureheat treatment and ball milling firstly in our experiments. TEM was performed to measure particle sizes. Nitrogenadsorption experiments were carried out to estimate specific surface area, porous distribution and porous ratio by BETand BJH methods. The content of Si-OH in SiO_2 surface was calculated by analysis of the results of hydrogen-oxygencontent mensuration (HOCM). As a result, appropriate heat treatment system and ball milling time are important topreparation for nano-SiO_2 with high activity and mesopores, which are 5～50 nm particles, 5～6 nm average aperture,85%～93% porous ratio, and 51%～55% Si-OH content in surface. Nano-SiO_2 with that structure has high surfaceenergy and activity. This process, which has simple facilities and operation rules, is a new way of preparation fornano-SiO_2 with high activity and mesopores.

关键词： Heat treatment Ball milling Mesopores Nano-SiO_2

Surface Modification of Ceramic Materials Using Excimer Laser

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Journal of Materials Science & Technology 2000年第4期16卷 401-404页

作者： Yingna WU, Zhongchao FENG and Jing LIANG (institute of Metal Research, Chinese Academy of Sciences, shenyang 110015, China) institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Changes of surface morphology following XeCI excimer laser irradiation were investigated for three engineering ceramic materials (Al2O3, Al2O3-SiC nanocomposite and Si3N4). Al2O3 and AI2O3-SiC nanocomposite samples exhibit a smooth rapid melt layer on the surface, and the formation of the metastabfe γ-Al2Oa was observed. A silicon-rich layer on the surface was formed after laser irradiation of Si3N4. The toughness K1c of the materials was measured by the indentation fracture method. After laser irradiation, the toughness of Al2O3, Al2O3-SiC nanocomposite and Si3N4 was improved to various degrees: Al2O3-SiC nanocomposite, 60% (max.); AI203, 40% (max.); Si3N4, 12% (max.).

关键词： Surface Modification of Ceramic Materials Using Excimer Laser SiC

Multirange Fractals in Materials: Applications to Fracture and Mechanical Alloying under Ball Milling

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Journal of Materials Science & Technology 1997年第4期13卷 255-259页

作者： Chiwei LUNG(International Centre for Materials Physics, institute of Metal Research,Chinese Academy of Sciences, shenyang 110015, China) International Centre for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A new model of multirange fractals is proposed to explain the experimental results observed on the fractal dimensions of the fractured surfaces in materials. A new explanation to the Williford's multifractal curve on the relationship of fractal dimension with fracture properties in materials has been given. It shows the importance of fractorizing out the effect of fractal structure from other physical causes and separating the appropriate range of scale from multirange fractals. Mechanical alloying process under ball milling as a non-equilibrium dynamical system has been also analyzed.

关键词： Ball Applications to Fracture and Mechanical Alloying under Ball Milling Multirange Fractals in Materials