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Characteristic atom arranging crystallogphy of alloy phases for Au-Cu system

Science china(Technological Sciences) 2011年第6期54卷 1560-1567页

作者： XIE YouQing1,2,3,LIU XinBi1,2,3,PENG HongJian4,NIE YaoZhuang5,LI XiaoBo6 & LI YanFen1,2,3 1 School of Materials Science and engineering,Central South university,Changsha 410083,china 2 Powder Metallurgy Research Institute,Central South university,Changsha 410083 china 3 State Key Laboratory of Powder Metallurgy,Central South university,Changsha 410083,china 4 School of Chemistry and Chemical engineering,Central South university,Changsha 410083,china 5 School of Physical Science and Technique,Central South university,Changsha,410083,china 6 college of mechanical engineering,xiangtan university,xiangtan 411105,china 1. School of Materials Science and engineering Central South University Changsha 410083 China2. Powder Metallurgy Research Institute Central South University Changsha 410083 China3. State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China4. School of Chemistry and Chemical Engineering Central South University Changsha 410083 China5. School of Physical Science and Technique Central South University Changsha 410083 China6. College of Mechanical Engineering Xiangtan University Xiangtan 411105 China

In this paper,it is pointed out that the descriptions of alloy phase structures are dependent on structural unit *** the systematic science of alloys(SSA),the alloy phase structures are described by means of the symmetry element sequence combining with characteristic atom *** is named the characteristic atom arranging structure,which can display the characteristic atoms at the lattice sites and the micro-inhomogeneity,besides the *** characteristic atom has its own characters:neighboring configuration,potential energy,volume and electronic *** micro-inhomogeneity of alloy phases can be described by concentrations and short-range ordered parameters of characteristic *** differences between the electronic structures of alloy phases and electronic structures of characteristic atoms in the alloy phases are also discussed.

关键词： systematic science of alloys Au-Cu system alloy phase structure micro-inhomogeneity

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A new type of wear resistant overlay welding rod

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中国有色金属学会会刊：英文版 2000年第3期10卷 372-374页

作者： ZHANG Qing hui(张清辉) mechanical engineering Institute, xiangtan university, xiangtan 411105, P.R.china xiangtan Univ Inst Engn Mech Xiangtan 411105 Peoples R China

By adopting the alloy wire of Ni 80 Cr 20 as the welding core and adding the alloy elements of B, Si, Mo and W into the outer plating covering, a new type of wear resistant overlay welding rod of Ni Cr B Si was developed. This overlay welding rod has several properties such as low melting point and good fluidity. With low content of W and Mo, the wearability and crack resistance of the overlay welding rod can be increased, and the hardness can be increased to about HRC64. This kind of overlay rod has been applied to the overlay of wearable workpieces, such as the valves of high temperature, high pressure and the side plates of floor boarding brick die.

关键词： Ni Cr B Si wear resistant alloys overlay welding rod

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EFFECT OF ALUMINIUM AND BORON ON SURFACE MODIFICATION OF SOME MATERIALS

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中国有色金属学会会刊：英文版 1995年第1期5卷 101-106页

作者： Dai Zhongxing Yang Zixia(mechanical engineering Department, xiangtan university, xiangtan 411105)

ＥＦＦＥＣＴＯＦＡＬＵＭＩＮＩＵＭＡＮＤＢＯＲＯＮＯＮＳＵＲＦＡＣＥＭＯＤＩＦＩＣＡＴＩＯＮＯＦＳＯＭＥＭＡＴＥＲＩＡＬＳＤａｉ；ＺｈｏｎｇｘｉｎｇＹａｎｇ；Ｚｉｘｉａ（ＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇＤｅ... 详细信息

ＥＦＦＥＣＴＯＦＡＬＵＭＩＮＩＵＭＡＮＤＢＯＲＯＮＯＮＳＵＲＦＡＣＥＭＯＤＩＦＩＣＡＴＩＯＮＯＦＳＯＭＥＭＡＴＥＲＩＡＬＳＤａｉ；ＺｈｏｎｇｘｉｎｇＹａｎｇ；Ｚｉｘｉａ（ＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，Ｘｉａｎｇｔａｎ...

关键词： Al-B co-diffusion microstructure co-diffusion layer surface modification

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Reactivity Ratios for Microemulsion Copolymeriration of N-butyl Maleimide and Styrene

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Chinese Chemical Letters 2000年第5期11卷 451-452页

作者： You Liang ZHAO Hua Ming LI Peng Sheng LIU (college of Chemistry and Chemical engineering, xiangtan university. xiangtan 411105) Coll. of Chem. and Chem. engineering Xiangtan University Xiangtan 411105 China

The oil-in-water microemulsion containing N-butyl maleimide(NBMI. M_1) and styrene(St, M_2) was prepared. The complexation properties of NBMI and St in microemulsion were investigated by means of 1H-NMR. With the participation of charge-transfer complex(CTC). four reactivity ratios and the relative reactivity of free monomers and CTC were obtained. The result was compared with that measured by Mayo-Lewis method.

关键词： N-Butyl maleimide styrene charge-transfer complex O/W microemulsion copolymeriation reactivity fation.

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Synthesis and Characterization of Polyurethane/Poly (Urethane Modified Bismaleimide-Bismaleimide) IPNs

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Chinese Chemical Letters 2000年第6期11卷 525-526页

作者： Yuan Li CAI Peng Sheng LIU (college of Chemistry and Chemical engineering, xiangtan university, Hunan 411105) xiangtan Univ Coll Chem & Chem Engn Xiangtan 411105 Peoples R China

PU/P(UBMI-BMI) IPNs with excellent thermal stability and mechanical properties were synthesized and characterized. The interpenetrating occurs in the hard segment domains of PU, which leads to enhancement of hydrogen ... 详细信息

关键词： PU/P(UBMI-BMI) IPNs synthesis characterization

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EFFECT OF MELT OVER-HEATING AND ZIRCONIUM ALLOYING ON THE MORPHOLOGY OF Al_9FeNi PHASE AND mechanical PROPERTIES OF 2618 ALLOY

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Acta Metallurgica Sinica(English Letters) 2002年第6期15卷 525-530页

作者： J.H. Wangmechanical engineering Institute of xiangtan university, xiangtan 411105, chinaD.Q. YiDepartment of Materials Science and Technology of Central South university, Changsha 410083, china mechanical engineering Institute of xiangtan university Xiangtan 411105 China

The effect of melt over-heating on the morphology of Al_9FeNi phase in 2618aluminum alloy with high contents of Fe and Ni and 0.22 wt. percent zirconium has been investigatedby optical microscopy. SEM and TEM. The mechanical properties of 2618 aluminum alloy after hotextrusion and quenching/aging have been tested. The results show: melt over-heating treatment of2618 alloy with high contents of Fe and Ni at 960 deg C led to finer and better-distributedneedle-like Al_9FeNi phase in cast microstructure and fine Al_9FeNi particles after hot extrusion;the grain size of the alloy after hot extrusion could also be refined evidently by alloying ofzirconium; the ambient and high temperature tensile strength and elongation of 2618 alloy have beenapparently enhanced due to fine Al_9FeNi particles and dispersed Al_3Zr as well as fine grain size.

关键词： melt over-heating 2618 alloy zirconium alloying morphology of Al_9FeNiphase mechanical property

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A Novel RAFT Polymerization under UV Radiation at Ambient Temperature

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复旦学报（自然科学版） 2005年第5期44卷 800-802页

作者： Nianfa Yang, Lican Lu, Yuanli Cai (college of Chemistry, xiangtan university, xiangtan, Hunan 411105, china) college of Chemistry Xiangtan University Hunan Xiangtan 411105

Reversible Addition Fragmentation chain Transfer (RAFT) polymerization has become a highly versatile technique for the controlled/"living" radical polymerization of a wide range of monomers under various conditions[1,2]. The RAFT polymerization was carried out using a dithiocarboxylate or trithiocarbonate as a Chain Transfer Agent (CTA), which mediates the growing chain radicals via an equilibrium[1,2]. From both academic and industrial standpoints, it is clearly desirable to develop a RAFT process under mild conditions. Rizzardo, et al [3] and McCormick's group[4] have respectively reported RAFT polymerization using conventional radical initiators at ambient temperature by adjusting the structure of CTA. The RAFT Polymerization initiated by γ-radiation has also reported recently[5]. Quinn, et al [6] have reported the RAFT polymerization under UV radiation using CTA as the source of primary radicals at 42 ℃, which was well controlled at low conversions (below 20% ) but less controlled at higher conversions (over 20% ) due to the photolysis of CTA residues under UV radiation.

关键词： RAFT 聚合物 UV辐射环境温度分裂链

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Highly Efficient and Well-controlled Ambient Temperature Raft Polymerization Under Visible Light Radiation

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复旦学报（自然科学版） 2007年第5期46卷 621-页

作者： Cai Yuan-li, Jiang Wen-ding, Yin Hui-wen, Lu Li-can(college of Chemistry, xiangtan university, xiangtan 411105, china) college of Chemistry Xiangtan University Xiangtan 411105

1 Results A range of well-defined polymers and their corresponding block copolymers were synthesized via ambient temperature RAFT polymerization under environmentally friendly visible light radiation,using a (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO) photo-initiator[1].The results indicated that the photolysis of chain transfer agent (CTA) functionalities was significantly suppressed under visible light radiation,thus exerting well control over RAFT process,leading to a remarkably living beh...

关键词： RAFT polymerization ambient temperature visible light radiation solar radiation

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Regularity properties of a class of hybrid methods

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Communications in Nonlinear Science and Numerical Simulation 2000年第1期5卷 27-30页

作者： Daxue CHEN and Aiguo XIAO Department of Basic Sciences, xiangtan college of mechanical and Electrical engineering, xiangtan411101, china Department of Mathematics, xiangtan university, xiangtan 411105, china e-mail: xiaoag@xtu. edu. cn, xag@lsec. cc. ac Department of Basic Sciences Xiangtan Coll. Mech. and Elec. Eng. Xiangtan 411101 China Department of Mathematics Xiangtan University Xiangtan 411105 China

The existence of spurious steady solutions and period-2 solutions in constant timestep is studied. The concepts of R[1]-regularity and R[2]-regularity of a class of hybrid methods for dynamical systems of ordinary differential equations are introduced and studied. Some conditions guaranteeing R[1]-regularity and R[2]-regularity of such methods applied to dynamical systems of ordinary differential equations with some important structures are given.

关键词： hybrid method dynamical system regularity spurious solution

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A thermodynamic assessment of Ce-Al system

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Rare Metals 2000年第4期19卷 255-260页

作者：尹付成苏旭平张平李智石英 xiangtan Univ Inst Mat Res Sch Mech Engn Xiangtan 411105 Peoples R China xiangtan Univ Inst Fundamental Mech & Mat Engn Xiangtan 411105 Peoples R China

The optimized descriptions of the phase diagram and thermodynamic properties for Ce-Al system have been obtained from experimental thermodynamic and phase diagram data by means of the computer program THERMO-CALC based on the least squares method, using models for the Gibbs energy of individual phases. The system contains five intermetallic compounds. The calculated standard enthalpies of Ce_3Al, CeAl, CeAl_2, CeAl_3 and Ce_3Al_ 11 are -26.7, -48.9, -48.4, -44.0 and -41.7 kJ/mol, respectively. A consistent set of thermodynamic parameters was derived. The optimized and experimental data are in good agreement.

关键词： Ce-Al system Phase diagram thermodynamic properties THERMO-CALC

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