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Damping property of Supersaturated ZnA127Ce Alloy during Natural Aging

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Journal of Materials Science & technology 2001年第1期17卷 9-10页

作者： Jingpei XIE Yaomin ZHU Yanpei SONG Xiaoying WANG and Quande CHEN dept.of Material Engineering , luoyang institute of technology, luoyang 47103.. {3. Dep. of Mater. Eng. Luoyang Inst. of Technol. Luoyang 471039 China

The microstructures and damping property of supersaturated ZnA127Ce alloy during natural aging have been investigated. H-800 TEM was mainly used to research the microstructures. The relationship between microstructure and damping property was primarily studied. The results showed that solution plus natural aging was the best heat treatment, which could improve the damping property. Both continuous precipitation and cellular reaction occurred during the aging. Continuous precipitation follows the sequence: β→spherical GP zones→elliptical GP zones→intermediate phase R→n. The cellular reaction can be written as follows:β→a+n+ε.

关键词： Ce Damping property of Supersaturated ZnA127Ce Alloy during Natural Aging

Development of Fundamental Research of SiC_w / Al Composites in HIT Part Ⅱ: Mechanical Behaviour of Squeeze-cast SiC_w / Al Composites

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Journal of Materials Science & technology 1994年第1期10卷 59-66页

作者： Jun LIU Dezun WANG and Congkai YAO(dept. of Metals and technology, Harbin institute of technology, Harbin, 150001, china) Harbin Inst of technology Harbin China

Studies on the mechanical behaviour of squeeze-cast SiCw / Al composites have been revjewed. The results show that SiCw / Al composites exhibit improved mechan ical properties and cyclic hard ening. The reasons leading to the above results are discussed. Localized deformation near SiC whiskers plays an important role in the initiation of microcracks in the composites, and the fracture of the composites is caused by the abrupt linking of microcracks

关键词： SiC Development of Fundamental Research of SiC_w Mechanical Behaviour of Squeeze-cast SiC_w Al Composites in HIT Part

Microstructure and Mechanical properties of ZrO_2-Ni Functionally Gradient Material

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Journal of Materials Science & technology 1994年第3期10卷 188-192页

作者： Jingchuan ZHU Zhongda YIN and Zhonghong LAI(dept. of Metals and technology, Harbin institute of technology, Harbin, 150001. china) Harbin Inst of technology Harbin China

The fabrication. microstructure and mechanical properties of ZrO2-Ni functionally gradient materials (FGM ) have been studied. FGM as well as non-FG M of ZrO2-Ni system was developed by powder metallurgical process. X-ray diffractometer (XRD ). electron probe microanalyzer (EPMA), scanning electron microscope (SEM ) and optical microscope were employed to investigate the crystalline phases. chemical composition and microstructure Experimental results demonstrate that the composition and microstructure of ZrO2-Ni FGM have the expected gradient distribution. There are no distinct interfaces in the FGM due to the gradient change of components. that is, the constituents are continuous in microstructure everywhere. Moreover, Vickers hardness and flexural strength were measured for the common composites as a function of composition. It is made clear that the mechanical properties of the FGM vary corresponding to the constitutional changes as well

关键词： FGM PSZ Microstructure and Mechanical properties of ZrO2-Ni Functionally Gradient Material Ni

Metallurgical investigations of dry sliding surface layer in phosphorous iron/steel friction pairs

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Science china Mathematics 2001年第S1期44卷 218-222页

作者： ZHANG Yongzhen CHEN Yue SHANGGUAN Bao TIE Xishun NI Feng dept. of Materials, luoyang institute of technology, luoyang 47103., {3. luoyang Inst Technol Dept Mat Luoyang 471039 Peoples R China

Surface layer behaviors of composition concentration and micro-hardness were inves-tigated on phosphorous cast irons after dry sliding. The experimental results indicate that thehardness and chemical composition unevenly distribute in the surface layer. The sliding conditionand microstructure of the pin specimen have greatly effects on the distributions.

关键词： surface layer hardness chemical composition concentration

Comparison of K_(IC) Values for SiC Whisker Reinforced Ceramic Composites Obtained by Using Various Methods

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Journal of Materials Science & technology 1994年第5期10卷 331-340页

作者： Tingquan LEI Guangyong LIN Shuangxi WANG and Yu ZHOU (dept. of Metals and technology, Harbin institute of technology, Harbin, 150001, china)(To whom correspondence should be addressed) Harbin Inst of technology Harbin China

The fracture toughness (KIC) values determined by indentation microfracture method (IM ) for SiC whisker reinforced Al2O3.and ZrO2 based composites were calculated with different IM equations and compared with those obtained by singte edge notched beam (SENB) technique. Experimental results show that the KIC (IM) values calculated with different equations are quite different one from another. For composites without phase transformable components the KIC (IM) and KIC (SENB) values are practically on the same level, but for composites with phase transformable components (partially stabilized zirconia) the KIC (SENB) values are always higher than KIC (IM). This is because that the IM method can not reveal sensitively the toughening effect due to dynamic t-m transformation of ZrO2 as the SENB method does. The accuracy of the IM method depends on the Suitability of the IM equations and was evaluated for the materials used in this investigation. Two new IM equations are suggested with which the KIC (IM ) values can be obtained very close to KIC (SENB) values for composites having phase transformable components.

关键词： SiC Values for SiC Whisker Reinforced Ceramic Composites Obtained by Using Various Methods Comparison of K IC

Hot Hydrostatic Extrusion of Mechanically Alloyed Al-4.9Fe-4.9Ni Powders

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Journal of Materials Science & technology 1994年第4期10卷 285-288页

作者： Guoxian LIANG Zhimin LI and Erde WANG (dept. of Metals Science and technology, Harbin institute of technology, Harbin, 150001, china)(To whom correspondence should be addressed) Harbin Inst of technology Harbin China

Al-4.9 Fe-4.9 Ni alloy powders have been synthesized by mechanical alloying. The rnechanically alloyed powders are consolidated by hot hydrostatic extrusion. The results show that extrusion tempereture. extrusion ratio and lubricant have great effects on the quality of extruded rods and their mechanical properties, The mixture of graphite and glass powders as lubricant can prevent the oxidization of cold compacted billet by cladding the billet with this lubricant before heating. This technique greatly simplifies the conventional densification process of powders

关键词： Fe Hot Hydrostatic Extrusion of Mechanically Alloyed Al-4.9Fe-4.9Ni Powders Ni Al

APprOXIMATION OF SPHERICAL MEANS OF MULTIPLE FOURIER INTEGRALS AND FOURIER SERIES ON SET OF FULL MEASURE

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Analysis in Theory and Applications 1994年第2期10卷 17-23页

作者： Wang Shiming Zhejiang institute of technology, china Math. Section {3. of Basic Courses Zhejiang institute of technology, Hangzhou, 3.0014, china 1. Math. Section dept. of Basic Courses Zhejiang Institute of Technology 310014 Hangzhou China

In this paper we consider the approximation for functions in some subspaces of L^2 by spherical means of their Fourier integrals and Fourier series on set of full measure. Two main theorems are obtained.

关键词： SET Th pro APprOXIMATION OF SPHERICAL MEANS OF MULTIPLE FOURIER INTEGRALS AND FOURIER SERIES ON SET OF FULL MEASURE Wang

A SYSTEMATIC ARCHITECTURE AND MODELING OF VIRTUAL MANUFACTURING AND MEASURING CELL

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Chinese Journal of Mechanical Engineering 1999年第4期12卷 247-253页

作者： Yao Yingxue Li Xiaojun Yuan Zhejun dept. of Mechanical Engineering, Harbin institute of technology Harbin Inst of technology Harbin China

The concept of virtual manufacturing and measuring cell (VMMC) is proposed, the systematic architecture of the VMMC is established and two key problems: the error fusion in machining and the reconstructable modeling of workpiece during virtual manufacturing and measuring, are discussed. An actual VMMC is presented as an example and its modularized frame is introduced.

关键词： Virtual manufacturing Virtual measuring Modeling Transform matrix

A Mobile Agent-Based prototype of HeterogeneousDistributed Virtual Environment Systems

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Journal of Systems Engineering and Electronics 2000年第2期11卷 61-65页

作者： Ji Qingge(dept. of Computer Science & Engineering, Harbin institute of technology, 150001, P. R. {3.)Wang Dongmu(Beijing Simulation Center, 100854, P. R. {3.)Hong Bingrong(dept. of Computer Science & Engineering, Harbin institute of technology, 150001 dept. of Computer Science&Engineering Harbin Institute of Technology 150001 P. R. China Beijing Simulation Center 100854 P. R. China

Mobile agents provide a new method for the distributed computation. This paper presents the advantages of using mobile agents in a distributed virtual environment (DVE) system, and describes the architecture of heterogeneous computer's distributed virtual environment system (HCWES) designed to populate some mobile agents as well as stationary agents. Finally, the paper introduces how heterogeneous computer network communication is to be realized.

关键词： Distributed virtual environment Mobile agent Distributed computing