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Decorating crystalline YFe_(2-x)Al_(x) on the Mg_(60)la_(10)Ni_(20)Cu_(10) amorphous alloy as “hydrogen pump” to realize fast de/hydrogenation

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journal of Materials Science & Technology 2024年第6期173卷 72-79页

作者： l.j.h.ang h.Wang l.z.Ouyang M.zhu h.j.lin School of Materials Science and Engineering Key Laboratory of Advanced Energy Storage Materials of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510641China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China

Mg-based amorphous alloys are one of the potential hydrogen storage materials but suffer from sluggish dehydrogenation/hydrogenation(de/hydrogenation)*** this work,as a new strategy,a hydrogen pump is built on the surface of amorphous alloys to solve this *** milling crystalline YFe_(2-x)Al_(x) hydrogen storage alloy with Mg_(60)la_(10)Ni_(20)Cu_(10) amorphous alloy,fine crystalline particles were seeded on amorphous alloy powder to form a“strawberry”*** to the TEM observation,a metallurgical bonding boundary formed between the Mg-based amorphous matrix and the Y-Fe-Al crystalline *** microstructure and de/hydrogenation kinetics investigation,the“hydrogen pump”effect of the seeded crystalline alloy was confirmed,which makes it much easier for the hydrogen to dissociate on and diffuse through the surface of the Mg-based amorphous *** such effect,the h absorption rate of Mg_(60)la_(10)Ni_(20)Cu_(10) amorphous alloy became almost eight times faster and it absorbs ~2.8 wt.% in 1 h at 130℃ under 4.5 MPa-h_(2).Further,fast hydrogenation can even achieve at 70℃ and the low-temperature dehydrogenation kinetics of the amorphous hydride can be also greatly *** present work proves that surface modification is of great importance for obtaining Mg-based amorphous alloy with ideal hydrogen storage performance.

关键词： hydrogen storage Mg-based amorphous alloy hydrogen pump Composite structure

ThE COUPlED FEM ANAlYSIS OF ThE TRANSIENT TEMPERATURE FIElD DURING INERTIA FRICTION WElDING OF Gh4169 AllOY

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Acta Metallurgica Sinica(English letters) 2007年第4期20卷 301-306页

作者： l.W. zhang j.B. Pei Q.z. zhang C.D. liu W.h. zhu S. Qu j.h. Wang The State Key laboratory for Materials Modification by laser Ion and Electron Beams Dalian University of Technology Dalian 116023 China School of Materials Science and Engineering Dalian University of Technology Dalian 116023 China Shenyang li Ming Aero-Engine Group Corporation Shenyang 110043 China

The inertia friction welding process is a non-linear process because of the interaction between the temperature field and the material properties as well as the friction force. A thermo-mechanical coupled finite element model is established to simulate the temperature field of this process. The transient temperature distribution during the inertia friction welding process of two similar workpieces of Gh4169 alloy is calculated. The region of the circular cross-section of the workpiece is divided into a number of four-nodded isoparametric elements. In this model, the temperature dependent thermal properties, time dependent heat inputs, contact condition of welding interface, and deformation of the flash were considered. At the same time, the convection and radiation heat losses at the surface of the workpieces were also considered. A temperature data acquisition system was developed. The temperature at some position near the welding interface was measured using this system. The calculated temperature agrees well with the experimental data. The deformation of the flash and the factor affecting the temperature distribution at the welding interface are also discussed.

关键词： inertia friction welding temperature field numerical simulation finite element method

NUMERICAl SIMUlATION OF ThE ThERMO-MEChANICAl PROCESS FOR BEAM BlANK CONTINUOUS CASTING

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Acta Metallurgica Sinica(English letters) 2007年第4期20卷 241-250页

作者： W. Chen Y.z. zhang C.j. zhang l.G. zhu B.X. Wang W.G. lu j.h. Ma Key laboratory of Metastable Materials Science and Technology College of Materials Science and Engineering Yanshan University Qinhuangdao 066004 China College of Metallurgy and Energy Engineering Hebei Polytechnic University Tangshan 063009 China Tangshan heavy Plate Co. ltd. Tangshan 063610 China hebei jinxi Steel Stock Co. ltd Tangshan 064302 China College of Mechanical Engineering Yanshan University Qinhuangdao 066004 China

The aim of this study was to simulate the solidification process of beam blank continuous casting, and then find the reasons for the typical defects of the beam blank. A two-dimensional transient coupled finite element model has been developed to compute the temperature and stress profile in beam blank continuous casting. The enthalpy method was used in the heat conduction equation. The thermo-mechanical property in the mushy zone was taken into consideration in this calculation. It is shown that at the mold exit the thickness of the shell had its maximum value at the flange tip and its minimum value at the fillet. The temperature had a great fluctuation on the surface of the beam blank in the secondary cooling zone. At the unbending point, the surface temperature of the web was in the brittleness temperature range under the present condition. To ensure the quality, it is necessary to weaken the intensity of secondary cooling. At the mold exit the equivalent stress and strain have higher values at the flange tip and at the web. From the spray 1 to the unbending point, the maximum values of stress and strain gradually moved to the internal section of the flange tip and the web. however, whenever, there were bigger stress and strain values near the flange tip and the web than in the other parts, it must be very easy to generate cracks at those positions. Now, online verification of this simulation has been developed, which has proved to be very useful and efficient to instruct the practical production of beam blank continuous casting.

关键词： beam blank continuous basting thermo-mechanical process simulation

Mapping Sea level Rise Behavior in an Estuarine Delta System：A Case Study along the Shanghai Coast

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Engineering 2018年第1期4卷 156-163页

作者： h.Q. Cheng j.Y. Chen z.j. Chen R.l. Ruan G.Q. Xu G. zeng j.R. zhu z.j. Dai X.Y. Chen S.h. gu X.l. zhang h.M. Wang State Key laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China Shanghai Water Planning Design and Research Institute Shanghai 200232 China Shanghai Water Authority Shanghai 200050 China School of Urban and Regional Science East China Normal University Shanghai 200062 China School of Ecological and Environmental Sciences East China Normal University Shanghai 200062 China Shanghai hydrological Station Shanghai 200232 China Shanghai Municipal Bureau of Urban Planning and land Resources Shanghai 200003 China Shanghai Institute of Geological Survey Shanghai 200072 China

Sea level rise （SlR） is a major projected threat of climate change that is expected to affect developing coastal cities located in estuarine delta regions, Shanghai is one such city, being located in the Yangtze River Delta （YRD）, It is difficult, however, for decision-makers to implement adaptation due to the uncer- tain causes, magnitudes, and timings of SlR behaviors, This paper attempts to map the causes and mag- nitudes of SlR behaviors on a decadal scale, We analyze the tidal level records from 11 tidal gauge stations and the corresponding bathymetry measurements around these stations since 1921, We identify three new SlR behaviors along the Shanghai coast due to anthropogenic geomorphologic changes （AGCs）, besides the well-known eustatic sea level rise （ESlR）, tectonic subsidence （TS）, and urban land subsidence （UlS）, The first new behavior is regional sea level rise （RSlR）, which occurs as a result of land reclamation and deep waterway regulation, The second is regional sea level fall （RSlF）, which occurs because the channel bed is eroded due to sediment supply decline in the river catchment, The last SlR behavior is local tidal datum rise （lTDR）. Thus, we project that the magnitude of SlR for the Shanghai coast ranges from 10 cm to 16 cm from 2011 to 2030, Clarifying SlR behaviors is important to aid local decision- makers in planning structural and non-structural measures to combat escalating flood damage costs in an estuarine delta system; this field is full of future challenges,

关键词： Sea level rise behavior Anthropogenic geomorphologic change local tidal datum Flood management Adaptation

Oxidation,Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys

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Acta Metallurgica Sinica(English letters) 2021年第7期34卷 1007-1020页

作者： Y.D.liu j.h.liu W.S.gu h.l.li W.h.li z.l.Pei j.Gong C.Sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In order to improve the oxidation and wear resistance of blades tip of titanium alloys as well as the sealing performance of the gas turbine engine,a Ni/cBN abrasive coating was prepared on titanium alloys through composite ***,mechanical and tribological properties of the abrasive coating were ***,the effect of the oxidation on the mechanical and tribological properties was also *** results revealed that the abrasive coating underwent slight oxidation within 700℃.Meanwhile,some intermetallic compounds,Ni3Ti,NiTi and NiTi2,were formed at the coating/substrate interface during *** to the pinning effect of cBN particles and the different thermal expansion coefficients of the coating and substrate,the coating/substrate interface was cracked after oxidation at 700℃.Tensile results showed that the presence of coating reduced the strength of the alloy significantly at room temperature,while only marginal variations of the strength of the coated and uncoated specimens at elevated ***,the wear tests indicated that the coating had the excellent cutting ability and wear resistance,which can effectively protect the blades tip of titanium *** the temperature increased,the wear resistance decreased due to the decrease in the mechanical properties of the Ni/cBN coating.

关键词： Abrasive coating Oxidation Mechanical properties Wear Titanium alloy

Effects of Growth Temperature on Structural and Electrical Properties of li-N-h Codoped znO

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journal of Materials Science & Technology 2013年第2期29卷 154-156页

作者： Y.F. lu z.z. Ye l.P. zhu Y.j. zeng j.Y. huang B.h. zhao State Key laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University

Effects of growth temperature on the structural and electrical properties of li-N-h codoped znO thin films grown by DC reactive magnetron sputtering were investigated. Scanning electron microscopy and X-ray diffraction results showed that increasing growth temperature could improve the crystalline quality. But hall measurement results showed that growth temperature had a nonlinear influence on the electrical property. The variation of electrical properties with the growth temperature was found to be related to the activated concentration of N in znO and the evaporation of li during the growth process, derived from the hall measurement and the second ion mass spectroscopy measurement.

关键词： znO Codoped Growth temperature Structural property Electrical property

Effect of grain size on fatigue cracking at twin boundaries in a CoCrFeMnNi high-entropy alloy

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journal of Materials Science & Technology 2020年第4期39卷 1-6页

作者： A.G.Wang X.h.An j.gu X.G.Wang l.l.li W.l.li M.Song Q.Q.Duan z.F.zhang X.z.l.ao School of Aerospace Mechanical&Mechatronic EngineeringThe University of Sydne0ySydneyAustralia State Key laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Materials Fatigue and Fracture Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Max-Planck-Institut für Eisenforschung Max-Planck-Stra?e 140237 DüsseldorfGermany

The fatigue cracking behavior at twin boundaries(TBs)in a Co Cr Fe Mn Ni high-entropy alloy with three different grain sizes was systematically investigated under low-cycle *** of grain size,the change from slip band cracking to TB cracking occurred with increasing the difference in the Schmid factors(DSF)between matrix and ***,the required critical DSF for the transition of the dominant cracking mode decreases with decreasing grain size due to the reduced slip band spacing that increases the impingement sites on the TBs and facilitates the coalescence of defects and voids to initiate TB cracks.

关键词： high-entropy alloy Fatigue cracking Twin boundary Slip band Grain size

Improving cyclic oxidation resistance of Ni_(3)Al-based single crystal superalloy with low-diffusion platinum-modified aluminide coating

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journal of Materials Science & Technology 2020年第19期54卷 132-143页

作者： h.liu M.M.Xu S.li z.B.Bao S.l.zhu F.h.Wang Institute of Metal Research Chinese Academy of SciencesWencui Road 62#Shenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaJinzhai Road 96#Hefei 230026China Shenyang National laboratory for Materials Science Northeastern UniversityWenhua Road 3#Shenyang 110819China

A low-diffusion Ni Re Pt Al coating((Ni,Pt)Al outer layer in addition to a Re-rich diffusion barrier layer)was prepared on a Ni_(3)Al-base single crystal(SC)superalloy via electroplating and gaseous aluminizing treatments,wherein the electroplating procedures consisted of the composite deposition of Ni-Re followed by electroplating of *** order to perform a comparison with conventional Ni Al and(Ni,Pt)Al coatings,the cyclic oxidation performance of the Ni Re Pt Al coating was evaluated at 1100 and 1150℃.We observed that the oxidation resistance of the Ni Re Pt Al coating was significantly improved by the greater presence of the residualβ-Ni Al phase in the outer layer and the lesser outward-diffusion of Mo from the *** addition,the coating with the Re-rich diffusion barrier demonstrated a lower extent of interdiffusion into the substrate,where the thickness of the second reaction zone(SRz)in the substrate alloy decreased by 25%.The mechanisms responsible for improving the oxidation resistance and decreasing the extent of SRz formation are discussed,in which a particular attention is paid to the inhibition of the outward diffusion of Mo by the Re-based diffusion barrier.

关键词： Ni_(3)Al-base superalloy Pt-modified aluminide coating Re-rich diffusion barrier Cyclic oxidation Interdiffusion Second reaction zone

CORROSION　FATIguE　CRACK　INITIATION　BEhAVIOR　OF　316l　STAINlESS　STEEl　IN　hANK’S　SOlUTION

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Acta Metallurgica Sinica(English letters) 1996年第5期9卷 333-337页

作者： j.h. Xie Y.S. Wu j.Q. he X.z.Yang and R.z. zhu (Department of Surface Science & Corrosion Engineering, University of Science and Technology Beijing,Beijing 100083, China)

This paper investigates the corrosion fatigue (CF) crack initiation behavior of 316l stainless steel in hank's solution which simulates bodylike fluid. The CF experiments were conducted under the conditions of electrochemically accelerated, free immersion and pre-polarized pitting potential. The results showed that 316l stainless steel was susceptible to pitting corrosion in hank's solution. Intergranular corrosion occurred obviously at the bottom of pits where the CF cracks initiated by the combined action of alternating stress and corrosive medium for the notch effect of stress concentrated in the grain *** CF crack propagation is both intergranular and transgranular.

关键词： aritificial joints 316l stainless steel simulated bodylike fluid,corrosion fatigue pitting corrosion,intergranular corrosion