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Effects of Positron Diffusion and Its Application in Composite System

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Journal of Materials Science & technology 2000年第3期16卷 311-314页

作者： Jian JIANG, Xinzhang ZHOU and ChiWei LUNG (International center for Materials Physics, institute of Metal research, Chinese Academy of Sciences, shenyang 110015, china) International center for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The effects of positron diffusion on the measured S parameter have been investigated by a point-source diffusion model and a δ function method. Firstly, the theoretical analyses of the effects are presented for the samples of a homogeneous semi-infinite medium and a film of definite thickness. Then the results are used to analyze the S parameters in several composite systems and interface models.

关键词： Effects of Positron Diffusion and Its Application in Composite System

Effects of Distribution of Induced Defects on Positron Diffusion

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Journal of Materials Science & technology 2000年第1期16卷 73-75页

作者： Xinzhang ZHOU, Jian JIANG and Chiwei LUNG (International center for Materials Physics, institute of Metal research, Chinese Academy of Sciences, shenyang 110015, china) International center for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The effects of distribution of induced defects on the positron diffusion was studied by using the point-source diffusion model and 6 function method.

关键词： Effects of Distribution of Induced Defects on Positron Diffusion

Microsegregation and Improved Methods of Squeeze Casting 2024 Aluminium Alloy

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Journal of Materials Science & technology 2003年第5期19卷 413-416页

作者： Yong ZHONG, Guoyue SU and Ke YANGThe National Engineering research center, the institute of Metal research, Chinese Academy of Sciences, shenyang 110016, china Natl. Eng. Res. Ctr. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The squeeze casting of a 2024 Al alloy was carried out to investigate the effect on microsegregation in the alloy of the application of pressure followed by diffusion annealing. The experimental results indicate that an optimum applied pressure followed by an optimum diffusion annealing process can markedly reduce the degree of microsegregation and improve the mechanical properties to a degree that can approach the level of forged 2024 Al alloy.

关键词： 2024 Al alloy Squeeze casting Microsegregation Diffusion annealing

Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying

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Journal of Materials Science & technology 2000年第2期16卷 125-126页

作者： Dianyu GENG, Zhidong ZHANG, Baozhi CUI, Zhijun GUO, Wei LIU and Xinguo ZHAO (International center for Materials Physics, institute of Metal research, Chinese Academy of Sciences, shenyang 110015, china) International center for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The structure and magnetic properties of SmyFe100-1.5yC0.5y(y=8～20) alloys prepared by mechanical alloying (MA) from Sm, Fe and graphite have been investigated systematically. In order to improve hard magnetic properties of the alloys prepared by mechanical alloying, a new method consisting of re-milling and re-annealing was developed. After being re-milled and re-annealed, the Curie temperature TC of the Sm-Fe-C alloys changes. The TC of 2:17 phase increases, whereas the TC of 2:14:1 phase decreases. After being re-annealed at low temperatures, the grain sizes of hard phases are smaller than those in the alloys annealed at high temperatures. The effects of Co or Ti substitution for Fe are studied.

关键词： Fe Hard Magnetic Properties of Sm-Fe-C Based Alloys Prepared by Mechanical Alloying Sm

Positron Lifetime Study of the Single-Phase B2 Ni_(100-x)Al_x and Ni_(50-x)Co_xAl_(50) Intermetallics

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Journal of Materials Science & technology 2000年第4期16卷 379-382页

作者： Rongshi CHEN, Jianting GUO and Wenlong ZHOU (Department of Superalloys, institute of Metal research, Chinese Academy of Sciences, shenyang 110015, china) Liangyue XIONG (International center for Materials Physics, and Liaoning Key Laboratory for Materials Department of Superalloys Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China Liaoning Key Laboratory for Materials and Hydrogen Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

In order to understand the point defect structure in NiAl Intermetallic compound, the positron lifetime in binary Ni_(100-x)Al_x (53≥x≥45) and ternary B2 Ni_(50-x)Co_xAl_(50) (x=0, 5, 10, 15) intermetallic compounds as a function of composition were measured. It is shown that the positron lifetime spectra of these compounds can be consistently expressed by single-component lifetimes. The positron lifetime value in ternary Ni_(50-x)Co_xAl_(50) alloy is independent of Co content and equal to that detected in both stoichiometric and Al-rich NiAl. From an analysis of the present results, it is suggested that the constant lifetime ofт≈180 ps should be ascribed to saturation trapping and annihilation of positron exclusively at Ni vacancy, no evidence for the presence of Al vacancy is available.

关键词： x)Co_xAl Intermetallics x)Al_x and Ni

Calculation of the Surface Segregation of Cu-0.3 at. pct Au Alloy

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Journal of Materials Science & technology 2000年第6期16卷 639-640页

作者： Liping ZHENG and Risheng LI (International center for Material Physics, Chinese Academy of Sciences, shenyang 110015, china) Yuanxun ZHANG and Shi QIU (Shanghai institute of Nuclear research, Chinese Academy of Sciences, Shanghai 201800, china) Bingyao JI Int. Cent. for Material Phys. Chinese Acad. of Sci. Shenyang 110015 China

Monte Carlo simulation technique with the energetics described by the embedded atom method has been used to calculate the surface segregation of Cu-0.3 at. pct Au alloy at T=800 K. It is found that the component Au in... 详细信息

关键词： Cu Calculation of the Surface Segregation of Cu-0.3 at pct Au Alloy

Microwave Disinfection in a Ventilation and Air-Conditioning System

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湖南大学学报（自然科学版） 2009年第S1期36卷 55-59页

作者： LU Zhen1,2,ZHANG Ji-li1,MA Liang-dong1,HE Juan3(1.School of Civil & Hydraulic Engineering,Dalian University of technology,Dalian,Liaoning 116023,china 2.Municipal and Environmental Engineering research center,shenyang Jianzhu University,shenyang,Liaoning 110168,china 3.School of Municipal & Environmental Engineering,Harbin institute of technology,Harbin,Heilongjiang 150090,china) School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116023 China Municipal and Environmental Engineering research center Shenyang Jianzhu University Shenyang 110168 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Because of its broad spectrum and high efficiency,the microwave disinfection was used to control the airborne microbial contaminates in VAC *** microwave disinfection devices were developed combined with air filter,the design and calculation method was presented,and the disinfection effects on White staphylococcus,Staphylococcus aureus,Bacillus Subtilis,Escherichi coli were *** results show that the major influence factors on disinfection effect are microwave power,water-content of filter material,disinfecting *** 15 min,the kill ratio is >90%,and the log value is >*** microwave field is uniform and the kill effect of bacteria on each surface of filter is the same,without statistically significant difference.

关键词： VAC system microwave disinfection airborne microbe microwave power kill ratio

SELF-LUBRICATING BEHAVIOR OF Fe-Re BINARY ALLOYS

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中国有色金属学会会刊：英文版 1995年第2期5卷 93-97,105页

作者： Xiong, Dangsheng Li, Shizhuo Jiang, Xiaoxia Peterson, M B (Powder Metallurgy research institute,Central South University of technology, Changsha 410083 institute of Metal research, Chinese Academy of Science, shenyang 110015 Wear Sciences, 925 Mallard C Central South Univ of technology Changsha China

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ＳＥＬＦ－ＬＵＢＲＩＣＡＴＩＮＧＢＥＨＡＶＩＯＲＯＦＦｅ－ＲｅＢＩＮＡＲＹＡＬＬＯＹＳ￥Ｘｉｏｎｇ，Ｄａｎｇｓｈｅｎｇ；Ｌｉ，Ｓｈｉｚｈｕｏ；Ｊｉａｎｇ，Ｘｉａｏｘｉａ；Ｐｅｔｅｒｓｏｎ，ＭＢ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａｒｃｈＩｎｓｔ...

关键词： lubrication Re oxide film glaze

Dislocation Velocity Exponent and the Strain Rate

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Journal of Materials Science & technology 2001年第3期17卷 363-366页

作者： Hongyan LIU and Xiaowei WANG International center for Material Physics, institute of Metal research, Chinese Academy of Sciences, shenyang 110016, china E-mail: liu@*** Chinese Acad Sci Met Res Inst Int Ctr Mat Phys Shenyang 110016 Peoples R China

The process of dislocation multiplication has been described hv chaos theory, trying to reveal the connection between the microstructures on the mesoscopic scale and the mechanical properties of material on the macroscopic scale. The relationship between the dislocation velocity exponent and the maximum of strain rate is given. The results obtained from logistic equation with exponent and the dislocation multiplication dynamic equation are compared. A scale law in one-dimension-map model with exponent is shown when the exponents of equations are changed.

关键词： Dislocation Velocity Exponent and the Strain Rate