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Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys

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Journal of materials Science & technology 2022年第13期108卷 244-255页

作者： L.R.Zeng L.M.Lei X.M.Luo G.P.Zhang Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical Engineering Chengdu UniversityChengdu 610106China AECC Shanghai co.mercial Aircraft Engine Manufacturing co. Ltd.Shanghai 201306China

Dwell fatigue effect is a long-standing problem threatening the long-term service reliability for fan blades and fan disks of an aircraft *** understand the basic mechanism of dwell fatigue damage,pure fatigue and 60 s dwell fatigue properties of bimodal Ti-6Al-4V alloys with different volume fractions of the primaryα(α_(p))phase were examined *** results showed that both pure fatigue and dwell fatigue life decreased with increasing the volume fraction of theα_(p)phase and the dwell fatigue life was lower than the pure fatigue *** quasi-in-situ test results and the quantitative characterization of damage behaviors of the local microstructure units defined by theα_(p)-seco.daryα(α_(s))co.bination reveal that theα_(s)phase close to theα_(p)phase with extensively slip activities was gradually damaged under dwell fatigue loading,while that under pure fatigue loading was undamaged,demonstrating that the dwell loading induced the damage of theα_(s)phase,and further reduced the fatigue life.A stress relaxation-based model is proposed to describe the physical mechanism on dwell fatigue damage of the bimodal Ti-6Al-4V alloy,*** elastic deformation of theα_(s)phase caused by the strain inco.patibility would be gradually transformed into plastic deformation during the dwell stage,and thus promotes fatigue *** model provides new insights into the microsco.ic process of stress/strain transfer between the soft and hard microstructure units under dwell fatigue loading.

关键词： Dwell effect Fatigue damage Stress relaxation Volume fraction of primaryαphase Quasi-in-situ testing

Nitrogen,phosphorus,and sulfur co.doped carbon nanotubes/melamine foam co.posite electrode for high-performance vanadium redox flow battery

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Journal of materials Science & technology 2024年第23期190卷 127-134页

作者： Xihao Zhang Lansong Liu Shaoyu Hou Qi Zhou Yanbo Zhang Xuehui Chen Nianwen Pu Jianguo Liu Chuanwei Yan institute of metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina Nano Science and technology institute University of Science and Technology of ChinaSuzhou 215123JiangsuChina Central Iron&Steel Research institute Group co. LtdBeijing 100080China Sichuan Xingming Energy and Environmental Protection technology co. LtdChengdu 610100SichuanChina

The high co.t and co.plex modification process of carbon felt electrodes limits its further popularization in vanadium redox flow batteries(VFBs).By introducing low-co.t melamine foam,nitrogen,phosphorus,and sulfur co.doped carbon nanotubes/melamine foam co.posite electrode(NPS-CNTs-CMF)is designed and fabricated via immersing melamine foam in a solution co.taining N,P,and S co.doped *** integration of modified CNTs significantly enhances the co.ductivity and hydrophilicity of the ***,the co.posite electrode also demonstrates outstanding electrocatalytic activity owing to the heteroatom doping that further inspired the electrocatalytic activity of *** function theory cal-culations further unco.er that introducing heteroatoms on CNTs not only promotes the adsorption of vanadium ions but also facilitates the electron transfer between vanadium ions and MF *** a result,the battery loading with NPS-CNTs-CMF exhibits excellent battery performance,achieving energy efficiency of 80.12%at 300 mA cm^(-2).Additionally,the long-term cycling stability is attained over 200 co.secutive charge-discharge cycles at 300 mA cm^(−2).This study provides a novel melamine foam mate-rial with low co.t and simple modification,and this new co.posite structure stimulates the development of high-performance electrodes in VFBs.

关键词： N,P,and S co.doped Carbon nanotubes Melamine foam Vanadium redox flow battery Electrode

Al-modification for PS-PVD 7YSZ TBCs to improve particle erosion and thermal cycle performances

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Journal of advanced Ceramics 2022年第7期11卷 1093-1103页

作者： Xiaofeng ZHANG Ming LI Ao ZHANG Shuangquan GUO Jie MAO Chunming DENG Panpan WANG Changguang DENG Junli FENG Min LIU Kesong ZHOU Cheng LAI National Engineering Laboratory for Modern materials Surface Engineering technology&the Key Lab of Guangdong for Modern Surface Engineering technology Institute of New MaterialsGuangdong Academy of ScienceGuangzhou 510650China PERA Guangzhou Information technology co. Ltd.Guangzhou 510650China chengdu Holy(Group)Industry co. Ltd.Chengdou 610000China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China Shenzhen Customs industrial Products Inspection technology Center Shenzhen 518067China

Plasma spray-physical vapor deposition(PS-PVD)as a novel process was used to prepare feather-like co.umnar thermal barrier co.tings(TBCs).This special microstructure shows good strain tolerance and non-line-of-sight(NLOS)deposition,giving great potential application in ***,due to serious service environment of aero-engine,particle erosion performance is a weakness for PS-PVD 7YSZ *** a solution,an Al-modification approach was proposed in this *** in-situ reaction of Al and ZrO2,anα-Al2O3 overlay can be formed on the surface of 7YSZ co.umnar *** results demonstrate that this approach can improve particle erosion resistance since hardness improvement of Al-modified ***,as another important performance of thermal cycle,it has a better optimization with 350-cycle water-quenching,co.pared with the as-sprayed TBCs.

关键词： plasma spray-physical vapor deposition(PS-PVD) thermal barrier co.tings(TBCs) Al-modification particle erosion resistance thermal cycle performance

Electrode co.nection optimization for both temperature difference and purification of lanthanum rod during solid-state electrotransport

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Rare metals 2023年第2期42卷 713-718页

作者： Jia-Min Zhong Zong-An Li Xiao-Wei Zhang Lin Zhou Zhi-Qiang Wang De-Hong Chen National Engineering Research Center for Rare Earth materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode co.nections of tantalum and the co.responding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was *** results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode co.nection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the *** these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.

关键词： Solid-state electrotransport Electrode co.nection Temperature difference metallic lanthanum Purification effect

Effect of friction on co.rosion behaviors of AISI 304 and Cr26Mo1 stainless steels in different solutions

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Journal of Iron and Steel Research International 2023年第12期30卷 2541-2556页

作者： Z.X.Dai S.L.Jiang L.K.Ning X.D.Xu S.Li D.L.Duan Shi-Changxu Innovation Center for advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina School of materials Science and Engineering University of Science and Technology of ChinaHefei230026AnhuiChina Liaoning Key Laboratory of Aero-engine materials Tribology Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina AnSteel LISco.Stainless Steel co. Ltd.Guangzhou510760GuangdongChina

The co.rosion and triboco.rosion behaviors of AISI 304 austenitic stainless steel and Cr26Mo1 ultrapure high chromium ferrite stainless steel in 3.5 wt.%NaCl and 0.5 mol/L H2SO4 solutions were *** electrochemical measurement technology was applied to identify electrochemistry behaviors during triboco.rosion tests in *** surface morphologies and co.positions of the wear tracks were analyzed by scanning electron microsco.y and Raman *** results showed that co.positions of stainless steels,co.rosive mediums and applied loads have great influence on triboco.rosion behaviors of stainless ***,the co.rosion resistance in static state of stainless steels primarily dominates its triboco.rosion behavior;meanwhile,better mechanical properties are in favor of triboco.rosion ***,the co.rosion rate is promoted significantly in 3.5%NaCl solution by friction,while the tendency is inco.spicuous in 0.5 mol/L H2SO4 *** but not least,passive films on stainless steels can be wiped off by small friction *** the increase in applied load,the effect of friction co.verts to forming friction oxide film from removing passivation film,so that a critical load exists below which the friction force can promote the co.rosion process extremely.

关键词： Triboco.rosion Stainless steel/PEEK friction pair co.rosive medium Applied load Microelectrode probe

Migration regularities of impurity aluminum and co.per in purification of metal lanthanum by solid-state electrotransport

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Rare metals 2021年第8期40卷 2307-2312页

作者： Zhi-Qiang Wang Zong-An Li Jia-Min Zhong De-Hong Chen Xiao-Wei Zhang Lin Zhou National Engineering Research Center for Rare Earth materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In view of the previous studies on the migrations of impurity aluminum(Al)and co.per(Cu)in purification of rare earth metal by solid-state electrotransport(SSE),there are still some questions about that which direction they migrate to and whether there are significant migrations or *** metal lanthanum(La)was used as research object,and the effects of migration temperature and time on the distributions and migration regularities of impurity Al and Cu were investigated in the present study by increasing co.centration of impurity Al and Cu in raw metal *** impurity migration direction and removal difficulty were intuitively judged by the residual rate distribution curve of *** is indicated that metal impurity Al and Cu in metal La at 800℃ with direct current are found to significantly migrate to anode and their residual rates near cathode decrease with the increase in migration temperature and prolongation of migration *** relatively large vapor pressure of Al and Cu makes their residual rate distribution curves being low in middle and high in *** metal La was co.tinuously purified for 100 h at 800℃ by SSE,the residual rates of impurity Al and Cu at 20 mm from cathode are 68.43%and 57.43%,respectively,showing that Cu is much easier to be removed than Al.

关键词： Solid-state electrotransport Purification Residual rate Rare earth metal Lanthanum

Hydrous cerium oxides co.ted glass fiber for efficient and long-lasting arsenic removal from drinking water

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Journal of advanced Ceramics 2021年第2期10卷 247-257页

作者： Ronghui Li Weiyi Yang Shuang Gao Jianku Shang Qi Li School of Gemology and Material technology Hebei GEO UniversityShijiazhuang050031China Key Laboratory of advanced Technologies of materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

A novel arsenic adsorbent with hydrous cerium oxides co.ted on glass fiber cloth(Hco.GFC)was *** Hco.GFC adsorbents were rolled into a cartridge for arsenic removal *** to the large pores between the glass fibers,the arsenic polluted water can flow through *** arsenic removal performance was evaluated by testing the equilibrium adsorption isotherm,adsorption kinetics,and packed-bed *** pH effects on arsenic removal were *** test results show that Hco.GFC filter has high As(Ⅴ)and As(Ⅲ)removal capacity even at low equilibrium *** more toxic As(Ⅲ)in water can be easily removed within a wide range of solution p H without *** co.taminated ground-water from Yangzong Lake(China)was used in the co.umn *** typical breakthrough co.ditions(the empty bed co.tact time,EBCT=2 min),arsenic researched breakthrough at over 24,000 bed volumes(World Health Organization(WHO)suggested that the maximum co.taminant level(MCL)for arsenic in drinking water is 10 mg/L).The Ce co.tent in the treated water was lower than 5 ppb during the co.umn test,which showed that cerium did not leach from the Hco.GFC material into the treated *** relationship between dosage of adsorbents and the adsorption kinetic model was also clarified,which suggested that the pseudo seco.d order model co.ld fit the kinetic experimental data better when the adsorbent loading was relatively low,and the pseudo first order model co.ld fit the kinetic experimental data better when the adsorbent loading amount was relatively high.

关键词： hydrous cerium oxide(Hco. glass fiber cloth(GFC) co.umn test adsorption kinetics adsorption mechanism

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

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Journal of advanced Ceramics 2020年第2期9卷 183-192页

作者： Dongxu LI Zong-Yang SHEN Zhipeng LI Wenqin LUO Xingcai WANG Zhumei WANG Fusheng SONG Yueming LI Energy Storage and co.version Ceramic materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen333000China chengdu Hongke Electronic technology co. Ltd.Chengdu610000China

(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric *** ceramics possess pure perovskite structure acco.panied from a tetragonal symmetry to pseudo-cubic one with the increase of x value,being co.firmed by X-ray diffraction(XRD)and Raman *** Tm co.responding to a temperature in the vicinity of maximum dielectric co.stant gradually decreases from 110℃(x=0.3)to-45℃(x=0.8),across Tm=36℃(x=0.5)with a maximum dielectric co.stant(ɛr=5920@1 kHz)around room *** saturated polarization Ps gradually while the remnant polarization Pr sharply decreases with the increase of x value,making the P-E hysteresis loop of BSxBNT ceramics goes slim.A maximum difference between Ps and Pr(Ps-Pr)is obtained for BSxBNT ceramics with x=0.5,at which a high reco.erable energy density(Wrec=1.04 J/cm3)is achieved under an applied electric field of 100 kV/cm with an efficiency ofη=77%.Meanwhile,the varied temperature P-E loops,fatigue measurements,and electric breakdown characteristics for the sample with x=0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.

关键词： energy storage ceramics Ba0.3Sr0.7TiO3(BST) Bi0.5Na0.5TiO3(BNT) relaxor ferroelectrics pulsed power capacitor

Surface pits stabilized Au catalyst for low-temperature co.oxidation

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Rare metals 2022年第9期41卷 3060-3068页

作者： Ya-Feng Cai Chen Fei Cheng Zhang Jie Yang Li Wang Wang-Cheng Zhan Yang-Long Guo Xiao-Ming Cao Xue-Qing Gong Yun Guo Key Laboratory for advanced materials and Research institute of industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China

Development of active and stable catalysts for low-temperature co.oxidation has long been regarded as a hot *** this co.tribution,we used CeO_(2) with high-density surface pits as support to prepare an active and stable Au/CeO_(2) catalyst by an adsorption-deposition *** obtained 0.05 wt%Au/CeO_(2)-TD(where TD represents thermal deco.position)can maintain its activity at 80℃ for more than 20 h or even after calcination at 800℃ for 2 *** characterization results showed that the high-density surface pits on CeO_(2)-TD play a decisive role in the stabilization of Au and enhancement of the redox *** work may provide a new strategy to improve the stability of supported metal catalysts by a simple and co.ventional method.

关键词： Au catalyst CeO_(2) Surface defect Stability co.oxidation