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In situ constructing lamella-heterostructured nanoporous CoFe/CoFe2O4 and CeO2-x as bifunctional electrocatalyst for high-current-density water splitting

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稀有金属（英文版） 2025年第2期44卷 1053-1066页

作者： Yue Deng Jin Wang Shao-Fei Zhang Zhi-Jia Zhang Jin-Feng Sun Tian-Tian Li Jian-Li Kang Hao Liu Shi Bai Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Materials Science and Engineering Tianjin UniversityTianjin 300380China Materials Science and Technology Research Department Ji Hua LaboratoryFoshan 528000China Advanced Laser Processing Research Team RIKEN Center for Advanced PhotonicsSaitama 351-0198Japan

The stability and electrocatalytic efficiency of transition metal oxides for water splitting is determined by geometric and electronic structure,especially under high current ***,a newly designed lamella-heterostructured nanoporous CoFe/CoFe2O4 and CeO2-x,in situ grown on nickel foam(NF),holds great promise as a high-efficient bifunctional electrocatalyst(named R-CoFe/Ce/NF)for water *** characterization verifies surface reconstruction from CoFe alloy/oxide to highly active CoFeOOH during in situ electrochemical *** virtues of three-dimensional nanoporous architecture and abundant electroactive CoFeOOH/CeO2-x heterostructure interfaces,the R-CoFe/Ce/NF electrode achieves low overpotentials for oxygen evolution(η10=227 mV;η500=450 mV)and hydrogen evolution(η10=35 mV;η408=560 mV)reactions with high nor-malized electrochemical active surface areas,***,the alkaline full water splitting electrolyzer of R-CoFe/Ce/NF‖R-CoFe/Ce/NF achieves a current den-sity of 50 mA·cm-2 only at 1.75 V;the decline of activity is satisfactory after 100-h durability test at 300 mA·*** functional theory also demonstrates that the elec-tron can transfer from CeO2-x by virtue of O atom to CoFeOOH at CoFeOOH/CeO2-x heterointerfaces and enhancing the adsorption of reactant,thus optimizing electronic structure and Gibbs free energies for the improvement of the activity for water splitting.

关键词： Lamellar nanoporous structure Electronic structure regulation High current density Theoretical calculation Overall water splitting

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Cyclic deformation behavior of a high-strength low-alloy(HSLA)magnesium alloy with heterostructures

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Journal of Magnesium and Alloys 2024年第11期12卷 4610-4621页

作者： H.Wang D.T.Zhang C.Qiu D.L.Chen Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou510640China Department of Mechanical Industrial and Mechatronics EngineeringToronto Metropolitan University(Formerly Ryerson University)TorontoOntario M5B 2K3Canada

Strain-controlled cyclic deformation behavior of a high-strength low-alloy(HSLA)Mg-1.2Zn-0.1Ca alloy fabricated via low-temperature extrusion at 150℃ was investigated at different strain *** to the partial dynamic recrystallization(DRX)during extrusion,the extruded HSLA magnesium alloy consisted of a unique heterostructure containing coarse unDRX grains and ultra-fine DRX grains of0.8μm,leading to a high tensile yield strength of 374 MPa and an elongation of 14%.The HSLA magnesium alloy exhibited cyclic stabilization at strain amplitudes of≤0.4%,while cyclic hardening occurred at strain amplitudes of≥0.6%.In contrast,the homogenized alloy with a uniform coarse-grained microstructure showed a strong cyclic hardening *** with the homogenized alloy,the HSLA magnesium alloy had a significantly higher cyclic stress level at all strain amplitudes,along with a longer fatigue life at lower and intermediate strain amplitudes owing to its higher monotonic ***,the homogenized alloy showed a longer fatigue life at a high strain amplitude of 0.8%due to its better ductility and stronger capacity of storing ***{10-12}<10-11>extension twinning occurred in both the homogenized and HSLA samples at high strain amplitudes,twins were primarily formed in the coarse un DRX grains in the compressive phase during cyclic deformation due to the c-axes of un DRX grains perpendicular to the loading direction,with twinning in the ultra-fine DRX grains being *** low-cycle fatigue life of both the homogenized and HSLA samples can be well predicted through an accumulative damage model based on the strain-energy density calculation and intrinsic fatigue toughness concept.

关键词： High-strength low-alloy(HSLA)magnesium alloy Low-temperature extrusion Heterostructure Low-cycle fatigue Cyclic deformation

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Epitaxial growth of Cu_(2-x)Se on Cu(220)crystal plane as high property anode for sodium storage

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Chinese Chemical Letters 2024年第7期35卷 519-523页

作者： Zhijia Zhang Shihao Sun Yuefang Chen Yanhao Wei Mengmeng Zhang Chunsheng Li Yan Sun Shaofei Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China

Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion ***,the thorough exploration of 3D architecture with a facile strategy is still *** we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy *** functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy *** virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current *** investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different *** novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.

关键词： Cu_(2)se 3D architecture Anode materials Density functional theory calculation Sodium-ion battery

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Effect of Acid-Producing Bacterium Citrobacter Farmeri on the Corrosion Behaviors of X70 Pipeline Steel in Simulated Seawater Culture Medium

SSRN

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SSRN 2024年

作者： Ma, Jing Chen, Jia-Hui Liu, Dan Feng, Zhi-Hao Wang, Jian-Gang Li, Jian-Hui Zhang, Xin School of Material Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-Net Forming Technology Shijiazhuang050018 China

Microbial corrosion causes significant harm to pipeline steel in seawater. In this paper, the effect of acid-producing bacterium Citrobacter farmeri on the corrosion behaviors of X70 steel in simulated seawater culture medium was investigated. Open circuit potentials (OCP), linear polarization resistances (LPR), and electrochemical impedance spectra (EIS), biofilm and pitting morphology observation results show that the presence of acid-producing bacterium C. farmeri accelerates the corrosion of X70 steel. The icorr in the C. farmeri medium is about 2.2 times that in sterile solution after 7 days of corrosion. The charge transfer resistance Rct of X70 steel in C. farmeri solution is much lower and the corrosion pits are numerous, which are concentrated at microbial enrichment sites and gather together to form a larger one. Oxygen differential concentration cell caused by the microbial film layer of transparent mucosa, complexation reactions and citric acid generated by C. farmeri accelerate local corrosion of the X70 steel, resulting in a relatively high corrosion rate. © 2024, The Authors. All rights reserved.

关键词： Corrosion rate

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High-strength extruded magnesium alloys:A critical review

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Journal of materials Science & technology 2024年第32期199卷 27-52页

作者： H.Wang X.C.Luo D.T.Zhang C.Qiu D.L.Chen Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Department of Mechanical Industrial and Mechatronics EngineeringToronto Metropolitan UniversityTorontoOntario M5B 2K3Canada School of Electrical and Mechanical Engineering Guangzhou Railway PolytechnicGuangzhou 510430China

Magnesium(Mg)has great potential for application in the automotive and aerospace sectors due to its abundant resources and low ***,the industrial applications of Mg alloys are far below alu-minum *** present,most commercial Mg alloys exhibit a low yield strength of<300 MPa,and their specific strength does not exhibit an advantage over that of aluminum alloys and high-strength *** the strength of Mg alloys is one of the key topics in this *** the past two decades,high-strength Mg alloys made by powder metallurgy and severe plastic deformation techniques have been reported,but the small sample dimension and high-cost limit their industrial ***-sion can be used to fabricate bulk materials with fine-grained microstructures and improved mechanical properties,which is considered as a suitable route of producing high-strength Mg alloys at the indus-trial *** this review,recent advances in the extrusion of different Mg alloys are briefly summa-rized,including commercial Mg alloys,high-alloyed Mg-RE alloys,and Ca-containing Mg *** strengthening strategies,including alloying,grain refinement,texture modification,etc.,are employed in developing high-strength Mg alloys,with special attention to a novel strengthening mechanism,namely hetero-deformation-induced strengthening,which has recently been applied to simultaneously improve the strength and ductility of Mg ***,the heterostructured Mg alloys prepared by extrusion are also introduced in this work,and the influences of alloying elements and extrusion parameters on the preparation of heterostructured Mg alloys are discussed ***,this review summa-rizes the effect of post-extrusion treatment on the mechanical properties of extruded Mg alloys,along with a brief comparison of the mechanical properties between Mg and Al ***,some poten-tial research directions for further advancing the high-performance and low-cost extr

关键词： Magnesium alloys Extrusion Heterostructure High strength

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Achieving superior strength-ductility synergy in a heterostructured magnesium alloy via low-temperature extrusion and low-temperature annealing

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Journal of materials Science & technology 2023年第32期163卷 32-44页

作者： H.Wang D.T.Zhang C.Qiu W.W.Zhang D.L.Chen Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)350 Victoria StreetTorontoON M5B 2K3Canada

A low-alloyed Mg-1.2Zn-0.1Ca(wt.%)alloy was fabricated via low-temperature extrusion and annealing at 250℃for different times(10,30,and 90 min)to attain heterostructures with different fine-grained fractions,focusing on the effect of heterostructure on the mechanical *** dynamic recrystallization(RX)occurred during extrusion at 150℃,and a lamellar structure consisting of fine RX grains and coarse unRX grains was *** subsequent annealing promoted static RX in the as-extruded alloy,leading to an increased fine-grained fraction from 67%to 95%.Meanwhile,the co-segregation of Zn and Ca atoms impeded the migration of grain boundaries,thus achieving a fine grain size of 0.8–1.6μ*** sample annealed for 10 min with a fine-grained fraction of 73%and an average RX grain size of 0.9μm exhibited a superior combination of high yield strength(305 MPa)and good ductility(20%).In comparison,an excellent elongation of 30%was achieved in the alloy with a nearly fully-RXed microstructure and an average grain size of 1.6μm after 90 min annealing,despite a lower yield strength of 228 *** unRX grains,the hard orientation with(01–10)parallel to the extrusion direction and high-density dislocations made it more difficult to deform compared with the RX grains,thus producing hetero-deformation induced(HDI)*** fine grains and high-density dislocations,HDI strengthening is the key to achieving the superior mechanical properties of the low-alloyed Mg alloy.

关键词： Low-alloyed magnesium alloy Low-temperature extrusion Annealing Heterostructure Mechanical properties

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Hierarchical microstructure enables high strength and good ductility in as-cast Fe_(27)Ni_(35)Cr_(18.25)Al_(13.75)Co_(2)Ti_(2)Mo_(2) high-entropy alloy

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Journal of materials Science & technology 2024年第12期179卷 9-21页

作者： Jiacheng Niu Zhiqiang Fu Weiping Chen Tiwen Lu Liangyan Hao Wei Xiong Haiming Wen Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou 510640China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Key Laboratory of Pressure Systems and Safety Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Physical Metallurgy and Materials Design Laboratory Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPittsburghPA15261United States of America Department of Materials Science and Engineering Missouri University of Science and TechnologyRollaMissouri 65409United States of America

As-cast alloys often require complex thermomechanical processing to obtain a hierarchical structure to achieve a good combination of strength and *** in this work,a novel hierarchical Fe_(27)Ni_(35)Cr_(18.25)Al_(13.75)Co_(2)Ti_(2)Mo_(2) high-entropy alloy(HEA)with ultra-high tensile strength and excellent ductility was fabricated by direct *** as-cast alloy exhibits hierarchical structure with an ul-trafine lamellar microstructure(ULM),ultrafine rhombus microstructure(URM),ultrafine vermicular mi-crostructure(UVM),nanosized precipitates and spinodal decomposition(SP)that develops during casting and *** incompatibility of face-centered cubic(FCC)and body-centered cubic(BCC)phases in the deformation process leads to heterogeneous deformation-induced(HDI)hardening,which brings the alloy a tensile yield strength(YS)of~1056 MPa,an ultimate tensile strength(UTS)of~1526 MPa and a total elongation(El)of~15.6%.Additionally,the numerous interfaces generated by the hierarchical structure absorb the energy during deformation,effectively retarding the dislocation motion and causing strong work-hardening.

关键词： Direct casting High-entropy alloy Hierarchical microstructure Mechanical properties

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High-strength and thermally stable TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy fabricated via selective laser melting

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International Journal of Minerals,Metallurgy and materials 2024年第10期31卷 2221-2232页

作者： Jiang Yu Yaoxiang Geng Yongkang Chen Xiao Wang Zhijie Zhang Hao Tang Junhua Xu Hongbo Ju Dongpeng Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China CEMMPRE-Centre for Mechanical Engineering Materials and Processes Department of Mechanical EngineeringUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal

To increase the processability and plasticity of the selective laser melting(SLM)fabricated Al-Mn-Mg-Er-Zr alloys,a novel TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy with a mixture of Al-Mn-Mg-Er-Zr and nano-TiB_(2) powders was fabricated by *** pro-cessability,microstructure,and mechanical properties of the alloy were systematically investigated by density measurement,microstruc-ture characterization,and mechanical properties *** alloys fabricated at 250 W displayed higher relative densities due to a uni-formly smooth top surface and appropriate laser energy *** maximum relative density value of the alloy reached(99.7±0.1)%,demonstrating good *** alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB_(2),Al6Mn,and Al3Er phases distributed along the grain *** directly aging treatment at a high tem-perature of 400℃,the strength of the SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy increased due to the precipitation of the secondary Al6Mn *** maximum yield strength and ultimate tensile strength of the aging alloy were measured to be(374±1)and(512±13)MPa,*** SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth,the incorporation of TiB_(2) nanoparticles,and the precipitation of secondary Al6Mn nanoparticles.

关键词： selective laser melting aluminum alloy processability mechanical properties thermal stability

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Enhancing Mechanical Performance and Cavitation Erosion-Corrosion Resistance in fcc Multi-Principal Element Alloy Through L12 Precipitates 75

Enhancing Mechanical Performance and Cavitation Erosion-Corr...

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75th World Foundry Congress, WFC 2024

作者： Niu, Jiacheng Fu, Zhiqiang Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510640 China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology Guangzhou510640 China

The effects of L12 nano-precipitates on the mechanical properties and resistance to cavitation erosion-corrosion (CE-C) of multi-principal element alloy (MPEA) with a fcc structure were investigated. Heat treatment involving homogenization and aging introduces abundant spherical L12 precipitates into the fcc MPEA matrix. This not only significantly enhances the alloy’s strength but also reduces volume loss in deionized water and NaCl solution, thereby improving its CE-C resistance. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Cavitation

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Microstructure and properties of TiAl/Ti2AlNb joint with TC1 intermediate layer obtained by spark plasma sintering diffusion welding 9

Microstructure and properties of TiAl/Ti2AlNb joint with TC1...

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9th International Conference on Mechanical Engineering, materials, and Automation technology, MMEAT 2023

作者： Fan, Jiafeng Li, Xiaoqiang Hou, Jinbao Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of Technology Guangzhou510640 China Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology Institute Beijing100024 China

ISBN: (纸本)9781510668584

Joining of high Nb content TiAl (TNM) and Ti2AlNb alloy is a research hotspot in aircraft engines. In the work, the TC1 thin was designed as the intermediate layer for joining TNM with Ti2AlNb alloy and the firm joint of TNM/TC1/Ti2AlNb was obtained by spark plasma diffusion welding. The joint was composed of TNM/TNM impacted zone/TC1 with TNM diffusion reaction zone/TC1 with Ti2AlNb diffusion reaction zone/Ti2AlNb impacted zone/Ti2AlNb. The TNM impacted zone consists of γ phase matrix and equiaxed α2 phase and Ti2AlNb impacted zone consists of needle-shaped β phase and α matrix phase. The TC1 diffusion reaction zone was composed of α matrix phase and some large equiaxed β phase and the Nb element from Ti2AlNb is the main reason for the formation of large equiaxed β-phase in this zone. The high temperature tensile strength of the joint at 700 ℃ reached 377 MPa, with the main fracture location at TC1 with TNM diffusion reaction zone. © 2023 SPIE.

关键词： Titanium alloys

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