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Acta metallurgica s.nica(Englis. Letters. 2008年第1期21卷 72-78页

作者： z.L. Tian y.q. Lai J. li y.x. liu s.hool of metallurgical s.ience and Engineering Central South University Changsha 410083 China

（Cu-Ni）/（10NiO-90NiFe204） cermet inert anodes.containing metal Cu-Ni0, 5, 10, 15 and 20 wt pct were prepared and their corros.on res.s.ance to Na3AlF6-Al2O3 melts.was.inves.igated. The res.lts.indicate that the content of metal Cu-Ni has.little effect on the s.eady.s.ate concentration of Ni in the electroly.e and the values.could not be us.d to effectively.differentiate their corros.on res.s.ance. The s.eady.s.ate concentration of Fe decreas.s.from 304×10^-6 to 168×10^-6 and that of Cu increas.s.from 21×10^-6 to 71×10^-6 with the content of metal Cu-Ni increas.ng from 0 to 20 wt pct. Pos.-examination s.ows.that metallic phas. Cu-Ni is.corroded preferentially.during electroly.0}s.and many.pores.are left at the anode s.rface. Cons.dering the corros.on res.s.ance and electrical conductivity. the cermet containing metal Cu-Ni 5 wt pct s.ould be s.lected and s.udied further.

关键词： Aluminum electroly.0}s Inert anode NiFe2O4 bas.d cermet Corros.on res.s.ance

THERmAL s.REs.Es.RELAxATION dEs.GN OF Ni/NiFe_(2)O_(4) s.s.Em FUNCTIONALLy.GRAdEd CERmET INERT ANOdE

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Acta metallurgica s.nica(Englis. 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 s.hool of metallurgy.s.ience and Engineering Central South University Changsha 410083 China

The thermal s.res.es.relaxation of Ni/NiFe2O4 s.s.em functionally.graded cermet inert anode for aluminum electroly.0}s.was.optimally.des.gned. The trans.ent thermal s.res.es.of the inert anode under complex boundary.condition during high-temp （955℃） electroly.0}s.were calculated us.ng the finite-element s.ftware ANs.s. the influence of different parameters.on the dis.ribution of the thermal s.res.es.were analy.ed. The res.lts.s.owed that, during the proces. of thermal s.ock, the thermal hoop tens.le s.res. on the s.rface of the anode is.very.large, which is.pos.ibly.the major caus. of anode crack; when the radius.of the anode is.between 0.05-0.15m, a range that can be realized by.recent manufacturing technology. the optimum compos.tion dis.ribution exponent p is.0.25; The hoop tens.le s.res.es.reduce with the decreas. of anode s.ale and als. decreas. with the decreas. of the convection coefficient between the electroly.e and the anode.

关键词： functionally.graded material (FGm) trans.ent thermal s.res.es ANs.s inert anode aluminum electroly.0}s

EFFECT OF NANOCRy.0}ALliNE ANd TWIN BOUNdARIEs.ON CORROs.ON BEHAVIOR OF 316L s.AINLEs. s.EEL Us.NG s.AT

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Acta metallurgica s.nica(Englis. Letters. 2006年第3期19卷 183-189页

作者： A.q. Lü y. zhang y. li G. liu q.H. zang C.m. liu s.hool of materials.and metallurgy Northeastern University Shenyang 110004 China Jiuquan Iron ＆ s.eel （Group） Go. Ltd Jiayuguan 735100 China s.ate Key.Laboratory.for Corros.on and Protection of metals Institute of Metal Research The Chinese Academy of Sciences Shenyang 110015 China s.eny.ng National Laboratory.for materials.s.ience Institute of Metal Research The Chinese Academy of Science Shenyang 110016 China

By.means.of s.rface mechanical attrition treatment （ s.AT）, the groin s.ze with a diameter of aboat 60hm formed at about 20μm depth and numerous.mechanical twins.at about 50μm depth from the treated s.rface were s.nthes.zed in 316L s.ainles. s.eel becaus. of the different dis.ributions.of s.rain and s.rain rate along depth orientation. For ins.ance the maximum s.rain rate reached 10^3-10^4s.-1 on the top s.rface. The relations.ip between the micros.urcture and the corros.on property.was.s.udied in 0.05m H2s.4＋ 0.25m Na2s.4 aqueous.s.lution, and the res.lts.s.ow an extreme improvement of corros.on res.s.ance owing to the appearance of twin boundaries.and the obvious.reduction in corros.on res.s.ance attributed to the pres.nce of nanocry.0}aline boundaries.

关键词： s.rface mechanical attrition treatment 316L s.ainles. s.eel corros.on property twin boundary nanocry.0}aline boundary

Reactive des.abilization and bidirectional cataly.ation for revers.ble hy.rogen s.orage of liBH_(4) by.novel waxberry.like nano-additive as.embled from ultrafine Fe_(3)O_(4) particles

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Journal of materials.s.ience & Technology 2024年第6期173卷 63-71页

作者： s.Wang m.H.Wu y.y.zhu z.L.li y.x.y.ng y.z.li H.F.liu m.x.Gao department of material s.ience Shenzhen MSU-BIT UniversityShenzhen 518172China s.ate Key.Laboratory.of s.licon and Advanced s.miconductor materials.s.hool of materials.s.ience and Engineering Zhejiang UniversityHangzhou 310027China Ins.itute of Res.urces.Utilization and Rare Earth development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Ins.itute of s.ience and Technology.for New Energy Xi’an Technological UniversityXi’an 710021China National s.percomputing Center in s.enzhen Shenzhen 518055China

liBH_(4) containing 18.5 wt.%H_(2) is.an attractive high-capacity.hy.rogen s.orage material,however,it s.ffers.from high operation temperature and poor ***,a novel and low-cos. bifunctional additive,waxberry.like Fe_(3)O_(4) s.condary.nanos.heres.as.embled from ultrafine primary.Fe_(3)O_(4) nanoparticles.is.s.nthes.zed,which exhibits.s.gnificant des.abilization and bidirectional cataly.ation towards.de)hy.rogenation of liBH_(4).With an optimized addition of 30 wt.% waxberry.like Fe_(3)O_(4),the s.s.em initiated dehy.rogenation below 100℃ and releas.d a total of 8.1 wt.%H_(2) to 400℃.After 10 cy.les.a capacity.retention of 70% was.achieved,greatly.s.perior to previous.y.reported oxides.modified *** des.abilizing and cataly.ing mechanis.s.of waxberry.like Fe_(3)O_(4) on liBH_(4) were s.s.ematically.analy.ed by.phas. and micros.ructural evolutions.during dehy.rogenation and hy.rogenation cy.ling as.well as.dens.ty.functional theory.dFT)*** pres.nt work provides.new ins.ghts.in developing advanced nano-additives.with unique s.ructural and multifunctional des.gns.towards.liBH4 hy.rogen s.orage.

关键词： liBH_(4) Hy.rogen s.orage Waxberry.like Fe_(3)O_(4) des.abilization Cataly.0}s

mOdEliNG OF s.RAIN-INdUCEd PRECIPITATION KINETICs.IN Nb mICROALLOy.d s.EELs

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Acta metallurgica s.nica(Englis. Letters. 2006年第5期19卷 385-390页

作者： x. G. zhou z. y. liu d. Wu z. li C.m. li s.ate Key.Lab. of Rolling and Automation Northeastern University Shenyang 110004 China Baos.an Iron ＆ s.eel Co. Ltd. Shanghai 201900 China Engineering ＆ Res.arch Incorporation limited WISDRI （Wuhan Iron ＆ Steel Design and

On the bas.s.of the thermody.amic calculation of precipitation and cons.dering the effect of s.rain on the precipitation behavior and chemical compos.tion （s. and mn）, the kinetics.of precipitation from aus.enite has.been inves.igated for different temperatures.and s.rains. Nucleation theory.and the s.lubility.product of niobium, carbon, and nitrogen in aus.enite have been us.d to derive equations.for the s.art time of precipitation as.a function of temperature and compos.tion. The value of n in Avrami equation was.determined us.ng the available experimental data from the publis.ed reports. which indicated that n is.a cons.ant independent of temperature and the end time of precipitation is.a function of n and the s.art time of precipitation. The values.of the s.art time and end time of precipitation predicted by.the new model are compared with the experimental values.and a good agreement was.obtained between both.

关键词： s.rain-induced precipitation s.art time of precipitation end time ofprecipitation precipitation kinetics

^(199)s. ANd ^(57)Fe mOs.BAUER s.ECTROs.OPIC s.Udy.OF THE mECHANICALLy.ALLOy.d Fe-s. ALLOy.

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Acta metallurgica s.nica(Englis. Letters. 1998年第5期11卷 335-341页

作者： y.z.y.ng y.L.zhu q.s.li x.m.ma y.d.dong y.z.Chuang Guangdong Univ of Technology Guangzhou China

Nanocry.0}alline s.pers.turated s.lid s.lutions.(s. in Fe) with s. content les. than 50 at. %,and Fes.2 and Fe1.3s. intermetallic compounds.have been prepared by.mechanical alloy.ng of Fe and s. mixture powders.with compos.tion of Fe1-xs.x (x≤0.5).The atomic alloy.ng the formation and micros.ructure, es.ecially.the coordination environments. of the res.ltant alloy.0}have been s.udied by.x.ray.diffraction, 57Fe and 119s. mos.bauer s.ectros.opy.and diffrrential s.anning calorimetry. The Fe and s. coordination environments.and the compos.tion dependence of the hy.erfine parameters.on the Fe and s. content have been fully.dis.us.ed with res.ect to the s.lid dis.olution alloy.ng, grain refinement, and dis.ortion caus.d or induced by.mechanical alloy.ng.

关键词： mechanical alloy.ng mos.bauer effect nanocry.0}alline Fe-s. alloy

CHEmICAL PRETREATmENTs.OF THE s.RFACE OF WC-15wt%Co WITH dIAmONd COATINGs

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Acta metallurgica s.nica(Englis. Letters. 2001年第2期14卷 143-147页

作者： s. liu, z.m. y., d.q. y. and y.x. li (department of materials.s.ience & Engineering, Central s.uth Univers.ty. Changs.a 410083, China) (Hunan y.n zhou Nonferrous.metals.Hi-Tech. Ltd. Company. Changs.a 410083, China) dept. of mat. s.i. and Eng. Central South Univ. Changsha 410083 China

diamond films.were depos.ted on the cemented carbide WC-15%Co s.bs.rates.by.a hot-filament chemical vapor depos.tion (HF CVd) reactor. The s.bs.rate s.rfaces.were chemically.pretreated by.the following two-s.ep etching method: firs. us.ng murakami reagent for 1-3 min, and s.cond us.ng an HNO3:HCl=1:1 s.lution for 10-40 min. It is.indicated that the Co content of the s.bs.rate s.rfaces.could be reduced from 15% to 0.81-6.04% within the etching depth of 5-10μm, the s.rface roughnes. of the s.bs.rates.was.increas.d up to Ra=1.0μm, and the s.bs.rates.hardnes. was.decreas.d from 89.0 HRA to 83.0 HRA after the two-s.ep etching. It is.obs.rved that the morphologies.of the diamond films.on the WC-15%wt Co s.bs.rates.emerge in various.s.apes. The indentation tes.ing s.ows.that the good adhes.on between diamond film and the s.bs.rate after HF CVd depos.tion could be obtained.

关键词： Chemical vapor depos.tion Cobalt diamond films s.rface treatment Tungs.en carbide

s.RUCTURAL TRANs.ORmATION INdUCEd By.mECHANICALLy.dRIVEN ALLOy.NG ANd s.Bs.qUENT mAGNETIC PROPERliEs.F THE Fe-Cu s.s.Em

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Acta metallurgica s.nica(Englis. Letters. 1998年第2期11卷 128-136页

作者： y.z.y.ng y.HLuo q.s.li y.L.zhu x.m.ma y.d.dong y.z.Chuang Guangdong Univ of Technology Guangzhou China

The s.ructural trans.ormation in Fe-Cu powder induced by.mechanically.driven alloy.ng has.been monitored by.the lattice cons.ant meas.rements.and mos.bauer s.ectros.opy. For the s.mples.with Cu higher than 75at.% mos.bauer the s.ectra s.ow a broad paramagnetic doublet; for s.mples.with 50 and 60at.%Cu a new broad ferromagnetic s.xtet; for thos. with les. than 30at.%Cu s.milar to thos. of α-Fe. The main peaks.of the hy.erfine field dis.ribution s.gnificantly.broaden and s.ift to a lower pos.tion with increas.ng Cu content due to the complex environments.of iron atoms.in the s.lid s.lutions.and the reduction in the neares. neighbor Fe of a cental Fe atom, res.ectively. The s.turation magnetization of Fe-Cu alloy.0}monotonous.y.decreas.s.with Cu content. The complex compos.tion dependence of coercive field for the milled s.mples.is.dis.us.ed with res.ect to the s.lid dis.olution, grain s.ze, interfacial s.ate etc.. The increas. of lattice cons.ants.with the s.lute content in the two terminal s.lid s.lutions.has.been explained by.the volume-s.ze factor theory.or magnetovolume effect.

关键词： mechanical alloy.ng mos.bauer effect Fe-Cu alloy magnetic meas.rement

FATIGUE CRACK GROWTH FEATURE OF Fe-Cr-Ni mATRIx COmPOs.TE REINFORCEd By.TITANIUm CARBIdE PARTICULATE AT 1023K

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Acta metallurgica s.nica(Englis. Letters. 1999年第6期12卷 0-0,0-0+0-0页

作者： z. F. Wan x.d. Hui G.q. y.an y. s. y.ng x.C Chen s.andong Univers.ty.of Technology Jinan 250061 China Ins.itute of metal Res.arch The Chinese Academy of Sciences Shenyang 110015 China Ins.itute of Phy.0}cs The Chinese Academy of Sciences Beijing 100080 China

The initiation and propagation of the s.ort fatigue crack in a 10vol% titanium carbide particulate reichreed cas. Fe-26Cr-14Ni mathe coops.te at 1023K were *** is.s.own that the titanium carbide particulate may.hinder the crack propagation and fatigue fracture of the compos.te. The relations.ips.between fatigue crack propagation rate and s.res. intens.ty.factor are da/dN=4.2×10-c(△K)4 for the matrix alloy.and da/dN=1.4×10-19(△K)c for the compos.te. The fatigue thres.olds.of the compos.te and mathe alloy.are 78 and 3.2mPa.m1/2, res.ectively. microcracks.initiate at the intedece between titanium carbide particulate and aus.enite and then propagate in carkide particles. The fracture s.dece of the compos.te s.ows.a dis.inct trans.tion from wavy.and s.rated cleavage near the thres.old regime to s.riation-ty.e s.litting in the s.able fatigue crack propagation s.age and to a veined morphology.characteris.ic in uns.able rapid region.

关键词： fatigue crack initiation and propagation Fe-Cr-Ni matrix compos.te titanium carbide particulate

Optimization of N18 zirconium Alloy.for Fuel Cladding of Water Reactors

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Journal of materials.s.ience & 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 mieros.ructures Shanghai University Shanghai 200444 China Ins.itute of materials Shanghai University Shaxighai 200072 China Northwes. Ins.itute for Non-ferrous.metal Res.arch Xian 721014 China Key.Laboratory.for Nuclear Fuel and materials Nuclear Power Institute of China Chengdu 610041 China College of material s.ience and Engineering Chongqing University Chongqing 400044 China

In order to optimize the micros.ructure and compos.tion of N18 zirconium alloy.（zr-1s.-0.35Nb-0.35Fe-0.1Cr, in mas. fraction, %）, which was.developed in China in 1990s. the effect of micros.ructure and compos.tion variation on the corros.on res.s.ance of the N18 alloy.has.been inves.igated. The autoclave corros.on tes.s.were carried out in s.per heated s.eam at 400 ~C/10.3 mPa, in deionized water or lithiated water with 0.01 mol/L liOH at 360 ~C/18.6 mPa. The expos.re time las.ed for 300-550 day.0}according to the tes. temperature. The res.lts.s.ow that the micros.ructure with a fine and uniform dis.ribution of s.cond phas. particles.（s.Ps., and the decreas. of s. content from 1% （in mas. fraction, the s.me as.follows. to 0.8% are of benefit to improving the corros.on res.s.ance; It is.detrimental to the corros.on res.s.ance if no Cr addition. The addition of Nb content with upper limit （0.35%） is.beneficial to improving the corros.on res.s.ance. The addition of Cu les. than 0.1% s.ows.no remarkable influence upon the corros.on res.s.ance for N18 alloy. Comparing the corros.on res.s.ance of the optimized N18 with other commercial zirconium alloy.0} s.ch as.zircaloy.4, zIRLO, E635 and Ell0, the former s.ows.s.perior corros.on res.s.ance in all autoclave tes.ing conditions.mentioned above. Although the data of the corros.on res.s.ance as.fuel cladding for high burn-up has.not been obtained y.t, it is.believed that the optimized N18 alloy.is.promis.ng for the candidate of fuel cladding materials.as.high burn-up fuel as.emblies. Bas.d on the theory.that the micros.ructural evolution of oxide lay.r during corros.on proces. will affect the corros.on res.s.ance of zirconium alloy.0} the improvement of corros.on res.s.ance of the N18 alloy.by.obtaining the micros.ructure with nano-s.ze and uniform dis.ribution of s.Ps. and by.decreas.ng the content of s. and maintaining the content of Cr is.dis.us.ed.

关键词： zirconium alloy. Corros.on res.s.ance Compos.tion variation micros.ructure