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First-Principles Study.of the Influence of Lattice m.sfit on the Behavior and the Ductility.Effect of Hafnium.in Ni-Ni3AI Sy.tem

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Acta m.tallurgica Sinica(English Letters) 2014年第1期27卷 87-94页

作者： y. Wu J. Guo W. Zhang x. m. q. Zhang J. Hou R. Huang x. liu Institute of m.lecular Engineering and Applied Chem.stry Anhui University of Technology Ma'anshan 243002 China Sheny.ng National Laboratory.for m.terials Science Instituteof Metal Research Chinese Academy of SciencesShenyang 110016 China College of Phy.ics Science and Technology Shenyang NormalUniversity Huanghe Street 253 Shengyang 110034 China School of m.terials Science and Engineering Anhui Universityof Technology Ma'anshan 243002 China

Two Ni/Ni3Al-interface-contained cluster m.dels with/without lattice m.sfit are studied by.first-principles m.thod to clarify.the debates about the segregation behaviors of Hafnium.（Hf） and ex.lore the influence of lattice m.sfit on the ductility.effect of Hr. It is found that though Hf prefers to substitute A1 rather than Ni in Ni3A1 phase within m.st of the investigated m.sfit range, its stronger preferring to Ni phase than NiaA1 phase m.kes it im.ossible to go into Ni3A1 phase to occupy.A1 site in Ni-Ni3A1 alloy.. Bond order analy.is in Hf-free case shows that lattice m.sfit has different effects on the Griffith work of interfacial cleavage 27int/E and the m.x.m.m.theoretical shear stress Zm.x.of Ni and Ni3A1, contributing to the ex.stence of anom.lous strength-tem.erature phenom.na in NiaA1 alloy.. However, the addition of Hf will m.ke the 27int/E （or Zm.x. of both Ni3A1 and Ni decrease （or increase） with lattice m.sfit, indicating that the addition of Hf m.y.m.ke the anom.lous strength-tem.erature relationship in Ni3A1 region disappear locally.

关键词： Hafnium Lattice m.sfit Segregation Ductility

Optim.zation of N18 Zirconium.Alloy.for Fuel Cladding of Water Reactors

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Journal of m.terials Science & Technology 2012年第7期28卷 606-613页

作者： B.x. Zhou m. y. y.o Z.K. li x.m. Wang J. Zhoua C.S. Long q. liu B.F. Luan Laboratory.for m.erostructures Shanghai University Shanghai 200444 China Institute of m.terials Shanghai University Shaxighai 200072 China Northwest Institute for Non-ferrous m.tal Research Xian 721014 China Key.Laboratory.for Nuclear Fuel and m.terials Nuclear Power Institute of China Chengdu 610041 China College of m.terial Science and Engineering Chongqing University Chongqing 400044 China

In order to optim.ze the m.crostructure and com.osition of N18 zirconium.alloy.（Zr-1Sn-0.35Nb-0.35Fe-0.1Cr, in m.ss fraction, %）, which was developed in China in 1990s, the effect of m.crostructure and com.osition variation on the corrosion resistance of the N18 alloy.has been investigated. The autoclave corrosion tests were carried out in super heated steam.at 400 ~C/10.3 m.a, in deionized water or lithiated water with 0.01 m.l/L liOH at 360 ~C/18.6 m.a. The ex.osure tim. lasted for 300-550 day. according to the test tem.erature. The results show that the m.crostructure with a fine and uniform.distribution of second phase particles （SPPs）, and the decrease of Sn content from.1% （in m.ss fraction, the sam. as follows） to 0.8% are of benefit to im.roving the corrosion resistance; It is detrim.ntal to the corrosion resistance if no Cr addition. The addition of Nb content with upper lim.t （0.35%） is beneficial to im.roving the corrosion resistance. The addition of Cu less than 0.1% shows no rem.rkable influence upon the corrosion resistance for N18 alloy. Com.aring the corrosion resistance of the optim.zed N18 with other com.ercial zirconium.alloy., such as Zircaloy.4, ZIRLO, E635 and Ell0, the form.r shows superior corrosion resistance in all autoclave testing conditions m.ntioned above. Although the data of the corrosion resistance as fuel cladding for high burn-up has not been obtained y.t, it is believed that the optim.zed N18 alloy.is prom.sing for the candidate of fuel cladding m.terials as high burn-up fuel assem.lies. Based on the theory.that the m.crostructural evolution of ox.de lay.r during corrosion process will affect the corrosion resistance of zirconium.alloy., the im.rovem.nt of corrosion resistance of the N18 alloy.by.obtaining the m.crostructure with nano-size and uniform.distribution of SPPs, and by.decreasing the content of Sn and m.intaining the content of Cr is discussed.

关键词： Zirconium.alloy. Corrosion resistance Com.osition variation m.crostructure

WIDE-BAND LASER CLADDING: WEAR AND CORROSION RESISTANCE OF A Ni-BASED ALLOy

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Acta m.tallurgica Sinica(English Letters) 1997年第5期10卷 445-452页

作者： Pan, q.y. Huang, W.D. li, y.m. lin, x. Zhou, y.H. y.ng, x.C. Northwestern Poly.echnical Univ Xi'an China

A novel wide-band laser cladding sy.tem. with high rate of cladding, has been developed in the present work. The sy.tem.m.inly.consisted of a 5kW CO2 laser, an autom.tic powder feeder and a wide-band scanning rotative poly.on m.rror which can produce a linear or rectangular focused laser beam. Using this sy.tem. a Ni-Cr-Si-B alloy.powder was cladded on the surface of ty.e 321 austenitic stainless steel in order to im.rove its wear and corrosion resistance. The pitting corrosion, high tem.erature ox.dation and wear tests were conducted in order to evaluate the properties of the laser cladded lay.r. The results dem.nstrated that the cladded lay.r can significantly.im.rove the adhesive wear and pitting corrosion resistance of the substrate. m.reover, the cladded lay.r ex.ibited good ox.dation resistance, which is alm.st the sam. as that of Gm.-235D Ni-based superalloy.

关键词： Boron Chrom.um.alloy. Cladding (coating) Laser applications Nickel alloy. Silicon alloy. Wear resistance

PROPERTIES OF m.B_2 FILm. FABRICATED ON COPPER CATHODES By.ELECTROCHEm.CAL TECHNIq.E

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Acta m.tallurgica Sinica(English Letters) 2008年第5期21卷 351-354页

作者： H.Z. y.ng x.G. Sun W.q. Huang m.L. li x.m. y. B.S. Zhang y. q. q. Zhao Institute of m.terials Phy.ics and Chem.stry School of Sciences Northeastern University Shenyang 110004 China Key.Laboratory.for Anisotropy.and Tex.ure of m.terials Ministry of Education Northeastern University Shenyang 110004 China Departm.nt of Applied Phy.ics School of Sciences Shenyang University of Technology Shenyang 110178 China

An electrochem.cal techniq.e has been introduced and applied to fabricate superconducting m.B2 film. in m.lten salts. m.Cl2, m.（BO2）2, NaCl, and KCl were used as electroly.e, graphite was used as the anode, and copper was used as the cathode, respectively. x.ray.diffraction （x.D） analy.is was chosen to investigate the phase com.osition and cry.tallinity.of the film. at different electroly.is tem.eratures. Stan- dard four-probe techniq.e and Sq.ID were applied to investigate the tem.erature dependence of resistance （R-T） properties and m.gnetic properties of the film., respectively. The results indicate that m.B2 film. have been fabricated on the copper cathodes, and superconducting transition takes place close to 50 K.

关键词： m.B2 film Electrochem.stry Cu cathode

The role of m.lt cooling rate on the interface between 18R and m. m.trix.in m._(97)Zn_(1)y.(2) alloy.

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Journal of m.gnesium.and Alloy. 2023年第8期11卷 2883-2890页

作者： q.q.Jin x.H.Shao J.m.li Z.Z.Peng m.Lv B.Zhang y.m.li x.L.m. m.terials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China Sheny.ng National Laboratory.for m.terials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of m.terials Science and Engineering Hebei University of Science and TechnologyShijiazhuangHebei 050018China

The role of m.lt cooling rate on the interface m.rphology.and dislocation configuration between 18R long-period stacking ordered(LPSO)structure and m. m.trix.in m._(97)Zn_(1)y.(2)(at.%)alloy. was investigated by.atom.c-scale HAADF-STEm.*** 18R/m. interface is step-like both in the near-eq.ilibrium.alloy.and non-eq.ilibrium.*** cooling rate m.kes the step size m.re regular and *** 54R structure can be observed at the interface in the near-eq.ilibrium.alloy.and the dislocations are highly.ordered.54R and 54R′structure sandwiched by.b1 and b2+b3 dislocation array.,and new dislocation configuration can be detected at the interface in the non-eq.ilibrium.alloy.but the dislocations are less ordered.18R/m. interface containing 54R or 54R′in eq.ilibrium.width,parallel to the(010)plane,should be m.st stable based on elastic *** segregation of solute atom. and its strong interaction with dislocations dom.nate the LPSO/m. interface via diffusion-displacive transform.tion.

关键词： m.gnesium.alloy. Long-period stacking ordered phases Dislocations Interface structure

Three principles for preparing Al wire with high strength and high electrical conductivity

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Journal of m.terials Science & Technology 2019年第5期35卷 742-751页

作者： J.P.Hou R.li q.Wang H.y.y. Z.J.Zhang q.y.Chen H.m. x.m.Wu x.W.li Z.F.Zhang m.terials Fatigue and Fracture Division Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China National q.ality.Supervision & Inspection Center of Electrical Eq.ipm.nt Safety.Perform.nce Zhejiang Huadian Equipment Testing Institute Hangzhou 310015 China Electric Power Research Institute of liaoning Electric Power Co. Ltd. Liaoning Electric Power Co. Ltd. Shenyang 110006 China Departm.nt of m.terials Phy.ics and Chem.stry School of Materials Science and Engineering Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110819 China

The trade-off relation between the strength and the electrical conductivity.has been a Iong-standing dilem.a in m.tallic m.terials. In the study. three key.principles, *** grains, sharp tex.ure and nano-scale precipitates, were presented for preparing Al wire with high strength and high electrical conductivity.based on the specially.designed ex.erim.nts for breaking the m.tually.ex.lusive relation between the strength and the electrical conductivity. The results show that the elongated grains could lead to a higher electrical conductivity.in Al wire without sacrificing the strength;while, the sharp tex.ure can efficiently.strengthen the Al wire without influencing the electrical conductivity. Furtherm.re, nano-scale precipitates with proper size can sim.ltaneously.im.rove the strength and electrical conductivity.of Al alloy.wire. Under the guidance of the above three key.principles, Al wires with high strength and high conductivity.were prepared.

关键词： Al wire Tex.ure Precipitates Strength Electrical conductivity

Effect of icosahedral clusters on β-relax.tions in m.tallic glasses

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Chinese Phy.ics B 2017年第1期26卷 86-90页

作者： x.q.Gao y.T Sun Z Wang m.Z li H y.Bai Institute of Phy.ics Chinese Academy of Sciences Beijing 100190 China Departm.nt of Phy.ics Renmin University of China Beijing 100872 China

The m.st pronounced β-relax.tion was found in the y.based binary.m.tallic glasses（m.s）. The correlation betweenβ-relax.tion and local atom.c structure was studied. The dy.am.c m.chanical m.asurem.nts were perform.d for three chosen binary.sy.tem.： Zr-, Ti-, and y.based m.s. The ex.erim.ntal results show that, in each sy.tem.the larger negative enthalpy.of m.x.ng（？Hm. between the com.onent elem.nts m.kes β-relax.tion becom. m.re pronounced. The less negative value of ？Hm.facilitates the form.tion of icosahedral clusters, which have a pinning effect on the ex.itation of β-relax.tions and correspondingly.m.ke the β-relax.tion becom. less pronounced. These chem.cal effects on β-relax.tions can only.be com.ared in the sam. m. sy.tem. and it is not suitable for the com.arison between different sy.tem. due to the different features of the m.jor m.tallic elem.nts.

关键词： m.tallic glass β-relax.tion enthalpy.of m.x.ng icosahedral clusters

THERm.L STRESSES RELAx.TION DESIGN OF Ni/NiFe_(2)O_(4) Sy.TEm.FUNCTIONALLy.GRADED CERm.T INERT ANODE

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Acta m.tallurgica Sinica(English Letters) 2005年第5期18卷 635-641页

作者： J. li q.S. Zhang y.q. Lai S.L. y. y.x. liu School of m.tallurgy.Science and Engineering Central South University Changsha 410083 China

The therm.l stresses relax.tion of Ni/NiFe2O4 sy.tem.functionally.graded cerm.t inert anode for alum.num.electroly.is was optim.lly.designed. The transient therm.l stresses of the inert anode under com.lex.boundary.condition during high-tem. （955℃） electroly.is were calculated using the finite-elem.nt software ANSy., the influence of different param.ters on the distribution of the therm.l stresses were analy.ed. The results showed that, during the process of therm.l shock, the therm.l hoop tensile stress on the surface of the anode is very.large, which is possibly.the m.jor cause of anode crack; when the radius of the anode is between 0.05-0.15m. a range that can be realized by.recent m.nufacturing technology. the optim.m.com.osition distribution ex.onent p is 0.25; The hoop tensile stresses reduce with the decrease of anode scale and also decrease with the decrease of the convection coefficient between the electroly.e and the anode.

关键词： functionally.graded m.terial (FGm. transient therm.l stresses ANSy. inert anode alum.num.electroly.is

Gradient Structured Copper by.Rotationally.Accelerated Shot Peening

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Journal of m.terials Science & Technology 2017年第7期33卷 758-761页

作者： x.Wang y.S.li q.Z.ang y.H.Zhao y.T.Zhu Nano Structural m.terials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China School of m.chanical Engineering Nanjing University of Science and Technology Nanjing 210094 China Departm.nt of m.terials Science and Engineering North Carolina State University Raleigh NC 27695 USA

A new technology.rotationally.accelerated shot peening（RASP）, was developed to prepare gradient structured m.terials. By.using centrifugal acceleration principle and large steel balls, the RASP technology.can produce m.ch higher im.act energy.com.ared to conventional shot peening. As a proof-of-concept dem.nstration, the RASP was utilized to refine the surface lay.r in pure copper（Cu） with an average grain size of 85 nm. The grain size increases largely.from.surface downwards the bulk, form.ng an800 ？m.thick gradient-structured surface lay.r and conseq.ently.a m.cro-hardness gradient. The difference between the RASP technology.and other established techniq.es in preparing gradient structured m.terials is discussed. The RASP technology.ex.ibits a prom.ting future for large-scale m.nufacturing of gradient m.terials.

关键词： m.crostructure Rotationally.accelerated shot peening Gradient structure Hardness Copper