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Biomimetic Design and Test of Composite materials

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Journal of materials Science & Technology 1993年第1期9卷 9-19页

作者： Benlian ZHOU international Centre for materials {2.,Institute of Metal Research,Academia Sinica,{3.,110015,china

A series of superior properties will make composites the most important structural materials in the next *** they are difficult to design owing to the complexity of structure and processing. Biomaterials had been naturally selected and evolved for millions of years,a great variety of their ra- tional composite structures could be taken as our reference in the biomimetic design of composite *** are many difficult problems in the current study on composite materials such as: brittleness of continuous fibers and difficulties in interface design;easy pull-out of short fibers from matrix causing failure in reinforcing;being less easy in selecting the aspect ratio of whiskers and dif- ficulties in finding the way of toughening composites of ceramic matrices as well as the way of heal- ing inner *** describing the distinct composite features,the functional adaptability and self-healing ability of biomaterials,several examples o.f biomimetic design of composite materials have been listed in this paper:the optimum design of composites simulating bamboo structure;the fine structure of bamboo fibers;the dumb-bell model simulating animal bone;the model on the pull-out of fiber with fractal-tree structure and some tentative works on the healing of inner damage in composite materials The methodology of biomimetic design and its future have been given at the ast part of this paper.

关键词： composite material biomimetic fiber

Wettability of molten Zr_(55)Cu_(3.)Al_(10)Ni_5 on alumina and zirconia

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Rare Metals 2007年第3期26卷 213-217页

作者： XU Qiangang WU Baoling ZHANG Haifeng HU Zhuangqi Department of materials Engineering Shenyang Institute of Aeronautic Engineering Shenyang 110034 China Institute of Metal Research Chinese Academy of Sciences Shenyang 1113016 China

The wetting behavior of molten Zr55Cu3.Al10Ni5 on Al2.3.and ZrO2.was studied using the sessile drop method. The results show that the nonwetting-to-wetting transition for the Zr55Cu3.Al10Nis/ZrO2.wetting system takes place at 1193.K. The wetting of molten Zr55Cu3.Al10Ni5 on Al2.3.is a non-reactive wetting. Owing to the formation of diffusion band at the front of the wetting tip in the Zr55Cu3.Al10Ni5/Al2.3.system, the wettability of Al2.3.is better than that of ZrO2.

关键词： zircon alloy wetting interface diffusion band

Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2.

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Journal of materials Science & Technology 1998年第6期14卷 555-558页

作者： Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection, Institute of Corrosion and Protection of Metals,chinese Academy of sciences,{2.,{3.) State Key Lab. for Corrosion and Protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2. was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2. solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2. was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2. by the equation:IH = 8.52. ×c0.72.9. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词： UNS NaCl Solution with H2. Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5

Adaptive synchronization of neural networks with different attractors

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Progress in Natural Science:materials international 2007年第6期17卷 687-695页

作者： Zhang Huaguang1, Guan Huanxin1 and Wang Zhanshan1,2.1. School of Information Science and Engineering, Northeastern University, shenyang 110004, china 2. School of Information Science and Engineering, shenyang Ligong University, shenyang 110168, china) School of Information Science and Engineering Northeastern University Shenyang 110004 China School of Information Science and Engineering Shenyang Ligong University Shenyang 110168 China

This paper aims to present an adaptive control scheme for the synchronization of two classes of uncertain neural networks with different attractors. A new sufficient condition for the global synchronization of two kinds of neural networks with different attractors is derived. The proposed control method is efficient and easy to be implemented. Numerical simulation is used to show the effectiveness of the obtained result.

关键词： neural networks attractor adaptive synchronization linear matrix inequality.

Transformation Behavior of Precipitates in a W-alloyed 10 wt pct Cr Steel for Ultra-supercritical Power Plants

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Journal of materials Science & Technology 2010年第9期26卷 817-822页

作者： Xiaoqiang Hu,Namin Xiao,Xinghong Luo and Dianzhong Li shenyang National Laboratory for materials Science,Institute of Metal Research,{2. Academy of {3.,shenyang 110016,china shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Thermodynamic calculation,thermal analysis,and identification and observation of precipitates have been carried out on a W-alloyed 10 wt pct Cr steel by means of ThermoCalc program,differential thermal analysis（DTA）,X-ray diffraction（XRD） and transmission electron microscopy（TEM） with an energy dispersive Xray spectrometer,*** critical phase transformation points were determined by combining experimental results with *** individually stable phases of Nb（C,N） and VN,instead of one single phase MX（X：C,N）,M2.C6 or Laves phases,were predicted in the calculated equilibrium phase *** unstable elongated M7C3.with relatively higher Cr was detected unexpectedly in the normalized and tempered *** kinds of spherical Nb（C,N） with different size were recognized as the primary and the secondary precipitates of Nb（C,N） which contain different V *** was observed that one kind of complex precipitate in a special V-wing shape was resulted from two plate-like VN adhering to coarse primary spherical Nb（C,N）.

关键词： Heat resistant steel Phase transformation Microstructure MX(X:C N) precipitate

Mechanical Properties and Temper Resistance of Deformation Induced Ferrite in a Low Carbon Steel

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Journal of materials Science & Technology 2010年第12期26卷 1107-1113页

作者： Luhan Hao,Namin Xiao,Chengwu Zheng and Dianzhong Li shenyang National Laboratory for materials Science,Institute of Metal Research,{2. Academy of {3.,shenyang 110016,china shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The microstructures and mechanical properties of deformation induced ferrite （DIF） in the low carbon steel Q2.5 under different deformation temperatures have been investigated systematically. Through deformation induced ferrite transformation （DIFT）, ferrite grain can be refined to 3.μm and accounts for above 85% of the overall fraction. Yield strength of DIF （〉500 MPa） is increased by up to 100% compared with the conventional low carbon steel. Comparison of microstructure and mechanical properties in the Q2.5 steel with DIF and tempered DIF microstructure illustrates that the strengthening mechanism of DIF microstructure is the combination of grain boundary strengthening and carbon supersaturated strengthening. Electron back-scattered diffraction （EBSD） analysis and high magnification scanning electron microscopy （SEM） observation denote that high-angle grain boundary among ultrafine ferrite grain and the transformation product of retain austenite membrane along ferrite boundaries are responsible for the stability of ferrite grain size during tempering process. Transmission electron microscopy （TEM） analysis demonstrates that the transformation product of retained austenite membrane between ferrite grain boundaries is cementite.

关键词： Low carbon steel Deformation Mechanical properties Temper induced ferrite transformation Grain size resistance

Oxidation Behaviour of Sputtered Ni-3.r-2.Al Alloy

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Journal of materials Science & Technology 2000年第1期16卷 88-90页

作者： Guofeng CHEN and Hanyi LOU (State Key Laboratory for Corrosion and Protection, Institute of Metal Research, chinese Academy of sciences,{2.,{3.) State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The oxidation behavior of sputtered Ni-3.r-2.Al coating at 900℃ in air was investigated. A dense Al2.3.layer was formed on the sputtered Ni-3.r-2.AI coating after 2.0 h oxidation. However, owing to the segregation of Ni3.l during oxidation process at high temperature, the spinel NiAI2.4 was also formed in the Al2.3.layer. It was found that the formation of NiAI2.4 had no detrimental effect on the oxidation resistance of the sputtered N?3.-2.AI coating due to the excellent adhesion shown by the Al2.3.and NiAl2.4complex oxide scale.

关键词： Al Oxidation Behaviour of Sputtered Ni-3.r-2.Al Alloy Cr Ni

In Situ Synthesis of Nanocrystalline Intel-metallic Compound Layer during Surface Mechanical Attrition Treatment of Zirconium

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材料热处理学报 2004年第5期 1242-1246页

作者： SUN Cai-yun', Xffi Ji-jia ', WU Xiao-lei', HONG You-shi', LIU Gang \ LU Jian3. LU Ke2.1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, chinese Academy of sciences, Beijing 100080, People's Republic of{2. 2. shenyang National Laboratory for materials sciences, Institute of Metal Research, chinese Academy of sciences, shenyang 110016, People's Republic of{2. 3. LASMIS, University of Technical of Troyes, 10000, Troyes, France

The surface mechanical attrition treatment (SMAT) technique was developed to synthesize a nanocrystalline (NC) layer on the surface of metallic materials for upgrading their overall properties and performance. In this paper, by means of SMAT to a pure zirconium plate at the room temperature, repetitive multidirectional peening of steel shots (composition (wt%): 1C, ***, base Fe) severely deformed the surface layer. A NC surface layer consisting of the intermetallic compound FeCr was fabricated on the surface of the zirconium. The microstructure characterization of the surface layer was performed by using X-ray diffraction analysis, optical microscopy, scanning and transmission electron microscopy observations. The NC surface layer was about 2. urn thick and consisted of the intermetallic compound FeCr with an average grain size of 2.±10 nm. The deformation-induced fast diffusion of Fe and Cr from the steel shots into Zr occurred during SMAT, leading to the formation of intermetallic compound. In addition, the NC surface layer exhibited an ultrahigh nanohardness of 10.2.GPa.

关键词： nanocrystalline intermetallic compound surface layer deformation diffusion

Mechanism of Macroalloying-induced Ductility in Ni_3.l

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Journal of materials Science & Technology 1994年第4期10卷 279-284页

作者： Changgong MENG Jianting GUO and Zhuangqi HU (Institute of Metal Research, chinese Academy of sciences, {2., {3., china)(To whom correspondence should be addressed) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The bonding characteristics of Ni3.l doped with ternary elements has been investigated by means of the discrete variational Xα (DV-Xα) cluster method. From the computations. the addition of ternary element M (M= Pd. Ag. Cu and Co) substituting for the Ni sttes leads to the increase of delocalized bonding electrons. and the mechanism of ductilization of Ni3.l bV doping with M is explained based on the analysis of bonding characteristics. The increase of delocalized bonding electrons lowers the covalent bond directionality and strengthens grain boundary. The difference of strength between M-Al bond and M-Ni bond is an important factor in the effect of alloy stoichiometry on ductility. The larger the difference. the more the sensitivity to the alloy stoichiometry

关键词： Mechanism of Macroalloying-induced Ductility in Ni3.l AIME Ni