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Superplastic Microforming of Zn-A122 Alloy Ribs

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Journal of Materials Science & Technology 2004年第2期20卷 236-238页

作者： Changli WANG, and Kaifeng ZHANGSchool of Materials Science arid Engineering, harbin institute of Technology, harbin 150001, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

Research on microforming of fine-grained superplastic Zn-AI22 alloy was carried out in this paper by means of superplastic forming. With the selected material, microformability tests have been carried out with the specially developed evaluation method by using two kinds of stainless steel dies. With these dies, micro-extrusion tests have been carried out and the characteristics of microformability of the material have been clarified. Effects of processing parameters and die structure on forming have been analyzed. SEM and metallographic microscope have been used to analyze the formed specimens. Through analysis of flow lines of the formed specimen, behavior of material could be understood well.

关键词： Superplastic forming Microformability Rib

Dynamic Viscoelasticity of Polyester/Rubber Composites under Cyclic Loading

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Journal of Materials Science & Technology 2005年第3期21卷 367-370页

作者： Yuyan LUY, Zhenhui TIAN, Zhimin XIE and Xingwen DU harbin institute of Technology, harbin 150001, China harbin institute of Technology Harbin 150001 China

This paper focuses on the influence of dynamic viscoelasticity and surface temperature on the fatigue mechanism and fatigue lifetime of polyester/rubber composites. Rubber composites show significant viscoelasticity during fatigue process. The variations of dynamic elastic modulus, mechanical loss angle, loss energy per cycle exhibit different trend in fatigue initial stage and final stage. Due to high viscoelasticity high heat generation occurs under cyclic loading, which leads to a high surface temperature. It is found that the variation of specimen surface temperature depends strongly on cycling frequency and stress amplitude. SEM (scanning electron microscopy) observation and static residual stiffness studies reveal that the surface temperature affects fracture morphology and fatigue lifetime of rubber composites strongly because of heat aging.

关键词： Rubber composites Fatigue Dynamic viscoelasticity Surface temperature

A Computer Aided System for Simulating Weld Metal Solidification Crack

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Journal of Materials Science & Technology 2001年第1期17卷 177-178页

作者： Yanhong WEI and Yingchun ZHANG National Key Laboratory of Advanced Welding Production Technology, harbin institute of Technology, harbin 150001, China Renpei LIU and Zujie DONG harbin Research institute of Welding, harbin 150080, China harbin Inst. of Technol. Harbin 150001 China

A computer-aided system for simulating weld solidification crack has been developed by which a welding engineer can carry out the welding solidification crack simulation on the basis of a commercial finite element analysis software package. its main functions include calculating the heat generations of the moving arc. mesh generation, calculating stress-strain distributions with element rebirth technique.

关键词： Figure A Computer Aided System for Simulating Weld Metal Solidification Crack

Remote collaborative pseudo-dynamic testing system based on acquisition board control

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Progress in Natural Science:Materials International 2007年第12期17卷 1487-1493页

作者： Wang Dapeng and Tian Shizhu(School of Civil Engineering, harbin institute of Technology, harbin 150090, China) School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

In this paper, NetSLab network platform for remote collaborative pseudo-dynamic testing, which was developed recently by a research group led by the Hunan University, is presented. Aiming at MTS system which is widely used in structural testing, the control method with acquisition board was investigated in this study to realize the communication interface between NetSLab and MTS system, and open up the remote collaborative pseudo-dynamic testing system. Using the developed testing system, a collaborative pseudo-dynamic testing on LAN was carried out successfully. The result manifests that the data transmission and collaborative control can be implemented accurately between NetSLab and MTS system, so that the usability of the testing system is validated.

关键词： remote sharing of testing equipment network platform communication interface acquisition board control collaborative pseudo-dynamic testing.

PHASE CONSTITUTE AND MICROGRAPHY OF REACTION SYNTHESIS OF Al+Ti+C SYSTEM

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同方期刊数据库

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Acta Metallurgica Sinica(English Letters) 1995年第2期8卷 130-136页

作者： ZHANG Erlin ZENG Songyan ZENG Xiaochun LI Qingchun(harbin institute of Technology,harbin,China harbin Inst of Technology Harbin China

In this paper,the effects of aluminum content,C/Ti ratio and the size of powders on the phase constitute and micrography of reaction synthesis of Al+Ti+C system have been studied by the use of XRD and *** has been shown that with the increase of aluminum content,in addition to TiC,Al_3Ti phase is also synthesised,and the content of Al_3Ti increase,and the size of TiC become fine,changing from 0.4-1.4μ*** increase of C/Ti ratio is favorable to the synthesis of TiC and can increase the Al content in which only TiC phase has formed,and has no effect on the micrography of TiC,but shows great in fluence on the micrography,of Al_*** addition,the size of titanium has no effect on the phase constitue and micrography,but the size of aluminum has great in fluence on *** the increase of size of aluminum powder,Al_3Ti will be synthesised and its content increase also,so it is unfavorable to the synthesis of TiC.

关键词： composite microstructure SHS composition

Surface Composition and Corrosion Property of TiNi Alloys Coated with Tantalum Films

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Journal of Materials Science & Technology 2004年第4期20卷 474-476页

作者： Yan CHENG, Wei CAI and Liancheng ZHAOSchool of Materials Science and Engineering, harbin institute of Technology, harbin 150001, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

Multi-arc ion plating method was employed to coat TiNi alloys with Ta in order to improve radiopacity and corrosion resistance property. The surface composition, corrosion resistance property and Ni ions release amount of TiNi alloys coated with Ta films compared with TiNi alloys, are investigated by means of X-ray photoelectron spectrometry (XPS), electrochemical measurements and atomic absorption spectrophotometry (AAS), respectively. The results show that the coated surface composition is composed of Ta and 0 and the corrosion resistance is improved, whereas the Ni ions release amount of the coated sample is lower than that of the uncoated samples in the whole immersion period, indicating that Ta coating can improve the biocompatibility of TiNi alloys.

关键词： TiNi alloy Tantalum Coating Corrosion

Synthesis and Characterizations of Nanocrystalline WC-Co Composite Powders by a Unique Ball Milling Process

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Journal of Materials Science & Technology 2004年第1期20卷 7-10页

作者： Jun SHEN, Jianfei SUN and Faming ZHANGSchool of Materials Science and Engineering, harbin institute of Technology, harbin 150001, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

In order to explore the high efficiency of fabricating nanocrystalline WC-Co composite powders, this paper presented a unique high energy ball milling process with variable rotation rate and repeatious circulation, by which nanocrystalline WC-10Co-0.8VC-0.2Cr3C2 (wt pct) composite powders with mean grain size of 25 nm were prepared in 32 min, and the quantity of the powders for a batch was as much as 800 grams. The as-prepared powders were analyzed and characterized by chemical analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential thermal analysis (DTA). The results show that high energy ball milling with variable rotation rates and repeatious circulation could be used to produce nanocrystalline WC-Co powder composites with high efficiency. The compositions of the powders meet its specifications with low impurity content. The mean grain size decreases, lattice distortion and system energy increase with increasing the milling time. The morphology of nanocrystalline WC-Co particles displays dominantiy sphere shape and their particle sizes are all lower than 80 nm. The eutectic temperature of the nanocrystalline WC-10Co-0.8VC-0.2Cr3C2 composites is about 1280℃.

关键词： Nanocrystalline material WC-Co composite High energy ball milling

SURFACE ROUGHNESS PREDICTION MODEL FOR ULTRAPRECISION TURNING ALUMINIUM ALLOY WITH A SINGLE CRYSTAL DIAMOND TOOL

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Chinese Journal of Mechanical Engineering 2002年第2期15卷 153-156,176页

作者： Wang Hongxiang Li Dan Dong shen Precision Engineering Research institute, harbin institute of Technology, harbin 150001, China Precision Engineering Research institute Harbin Institute of Technology Harbin 150001China ***

A surface roughness model utilizing regression analysis method is developedfor predicting roughness of ultra-precision machined surface with a single crystal diamond tool. Theeffects of the main variables, such as cutting speed, feed, and depth of cut on surface roughnessare also analyzed in diamond turning aluminum alloy. In order to predict the optimum cuttingconditions during process planning. A lot of experimental results show that the model can predictthe surface roughness effectively under a certain cutting conditions.

关键词： Surface roughness Regression analysis Diamond turning Diamond tool

Comment on “Recent progress in thermodynamics of radiation——exergy of radiation,effective temperature of photon and entropy constant of photon”

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Science China(Technological Sciences) 2009年第6期52卷 1809-1810页

作者： LIU LinHua School of Energy Science and Engineering,harbin institute of Technology,harbin 150001,China School of Energy Science and Engineering Harbin Institute of Technology

Chen et *** the concepts of effective temperature of photon and entropy constant of photon in a recent paper [Chen Z S,Mo S P,Hu *** progress in thermodynamics of radiation―exergy of radiation,effective temperature of photon and entropy constant of *** China Ser E-Tech Sci,2008,51(8):1096―1109] by enduing a single photon with macroscale thermodynamic parameters such as exergy and *** paper argues that applying these concepts and their inferences to macro-scale thermodynamic system will lead to the results which conflict with macroscale thermodynamic *** means that the concepts of effective temperature of photon and entropy constant of photon are not correct.

关键词： thermodynamics of radiation photon entropy exergy