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Designing gradient nanograined dual-phase structure in duplex stainless steel for superior strength-ductility synergy

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Journal of materials Science & Technology 2024年第3期170卷 122-128页

作者： Songsong Xu Ying Han Jiapeng Sun Guoqing Zu Mingkun Jiang Weiwei Zhu Xu Ran key laboratory of Advanced structural materials Ministry of EducationChangchun University of TechnologyChangchun 130012China School of materials Science and Engineering Changchun University of TechnologyChangchun 130012China Provincial key laboratory of Advanced materials processing and Application for Rail Transit Changchun University of TechnologyChangchun 130012China College of Mechanics and materials Hohai UniversityNanjing 211100China

Similar to other metallic materials,duplex stainless steel dramatically loses its advantage of high ductility as they are strengthened.Here,we produce a gradient nanograined dual-phase structure in the 2101 duplex stainless steel,thus facilitating a superior strength-ductility synergy:a yield strength of 1009.5 MPa being two times higher than that of the as-received sample,a total elongation of 23.4%and a uniform elongation of 5.9%.This novel structure is produced through a processing route of ultrasonic severe surface rolling and annealing,which realizes a superposition of gradient nanostructure and lamellar dual-phase structure with austenite and ferrite.During the tension deformation of gradi-ent nanograined dual-phase structured duplex stainless steel,a significant accumulation of geometrically necessary dislocations occurs.These dislocations are formed to accommodate the deformation incompat-ibility caused by the layer-by-layer difference in strength and hardness of individual phase domains,as well as the inherent difference in properties between the austenite and ferrite domains.This results in a stronger hetero-deformation induced strengthening and hardening significantly contributing to superior mechanical properties.Our study provides a new avenue to develop advanced steels with high strength and ductility.

关键词： Gradient structure Duplex stainless steel Synergetic strengthening Strength Ductility

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high strength mullite-bond SiC porous ceramics fabricated by digital light processing

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Journal of Advanced Ceramics 2024年第1期13卷 53-62页

作者： Jian Sun Jingde Zhang Xu Zhang Zihe Li Jianzhang Li Sijie Wei Weibin Zhang Weili Wang Guifang Han key laboratory for Liquid-Solid structural Evolution and processing of materials(Ministry of education) School of Materials Science and EngineeringShandong UniversityJinan 250061China key laboratory of Special Functional Aggregated materials Ministry of EducationShandong UniversityJinan 250100China materials and Structures Research Centre Department of Mechanical EngineeringUniversity of BathBath BA27AYUK National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology Xi’an Golden Mountain Ceramic Composites Co.Ltd.Xi’an 710118China School of Physics and materials Science Changji UniversityChangji 831100China

Fabricating SiC ceramics via the digital light processing(DLP)technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders,which highly differ from those of resin,and thus significantly affect the curing performance of the photosensitive SiC slurry.In this paper,a thin silicon oxide(SiO_(2))layer was in-situ formed on the surface of SiC powders by pre-oxidation treatment.This method was proven to effectively improve the curing ability of SiC slurry.The SiC photosensitive slurry was fabricated with solid content of 55 vol%and viscosity of 7.77 Pa·s(shear rate of 30 s^(−1)).The curing thickness was 50μm with exposure time of only 5 s.Then,a well-designed sintering additive was added to completely convert low-strength SiO_(2) into mullite reinforcement during sintering.Complexshaped mullite-bond SiC ceramics were successfully fabricated.The flexural strength of SiC ceramics sintered at 1550℃in air reached 97.6 MPa with porosity of 39.2 vol%,as high as those prepared by spark plasma sintering(SPS)techniques.

关键词： digital light processing(DLP) SiC ceramics pre-oxidation mullite-bond SiC mechanical properties

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3D anchoring structured for LiFe_(0.5)Mn_(0.5)PO_(4)@cornstalk-C cathode materials

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中国化学快报:英文版 2023年第8期34卷 302-305页

作者： Guangliang Zhang Riran Zang Man Mo Zhijie Fang Yangxian Huang Kunsong Hu Jiali Huang Xinxiang Liu Lingyun Huang Guohui Kang Weijian Li Haiqing Zhan Xianquan Ming Guanhan Huang Guiliang Li Feng Zhan School of Resources Environment and materials Guangxi UniversityNanning 530004China School of Electronics Engineering Guangxi University of Science and TechnologyLiuzhou 545006China State key laboratory of Featured Metal materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China guangxi higher education key laboratory of high performance structural materials and heat treatment&surface processing Guangxi UniversityNanning 53004China South Manganese Group Limited Nanning 530029China

The organic carbon source coating LiFe_(x)Mn_(1-x)PO_(4)suffers from the problem of non-uniform carbon cladding.Too thick carbon cladding layer instead hinders the de-embedding of lithium ions.In this paper,we choose cornstalk as the carbon source,then LiFe_(0.5)Mn_(0.5)PO_(4)@cornstalk-C(LFMP@C-C)with 3D anchoring structure is prepared by the solvothermal method.The results show that the LFMP with cornstalk as the carbon source has better performance compared to the sucrose-coated LFMP material(LFMP@C).The discharge capacity of LFMP@C-C is 116 mAh/g for the first cycle at 1 C and the capacity retention rate is 94.0%after 500 cycles,and the discharge capacity of LFMP@C-C is more than 17.17%higher than that of LFMP@C.

关键词： LiFe_(0.5)Mn_(0.5)PO_(4) Cornstalk Solvothermal method 3D anchoring structure Cathode materials

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Strength-toughness improvement of 13Cr4NiMo martensitic stainless steel with thermal cyclic heat treatment

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1499-1510页

作者： Jie Xiong Yao-lin Tong Jie-long Peng Sheng-hua Zhang State key laboratory of Featured Metal materials and Life-Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materialsand School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004GuangxiChina key laboratory of high performance structural materials and Thermo-surface processing Education Department of Guangxi Zhuang Autonomous RegionGuangxi UniversityNanning 530004GuangxiChina

To improve the strength-toughness of 13Cr4NiMo martensitic stainless steel(13-4MSS),a thermal cyclic heat treatment(TCHT)combined with the advantage of tempering was proposed.The microstructures were characterized by scanning electron microscopy,X-ray diffraction and electron backscattered diffraction,and the mechanical behaviors in terms of tensile properties and impact toughness were analyzed in correlation with microstructural evolution.It was found that grains and the martensitic matrix were refined by TCHT through the cyclic quenching transformation and austenite recrystallization,which was conducive to more nucleation quantity of reversed austenite during tempering.Two-sphericalcap nucleation model was used to explain the effect of refined grains of TCHT on the nucleation of reversed austenite.Grain refinement by TCHT improved the brittle fracture stress to reduce the ductile-brittle transition temperature and thus improved the cryogenic impact toughness of 13-4MSS.Reversed austenite distributed at the martensitic lath boundary enhances the crack arrest performance and increases the britle fracture stress.It is concluded that reasonable TCHT plus tempering process significantly improves the strength-toughness of 13-4MSS,reflecting the comprehensive effect of grain refinement and reversed austenite.

关键词： Strength-Toughness 13Cr4NiMo martensitic stainless steel Thermal cyclic heat treatment Grain refinement Reversed austenite

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Facile surface Engineering of NiCo_(2)O_(4) to Boost Propane Oxidation Activity

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China Petroleum processing & Petrochemical Technology 2024年第1期26卷 19-26页

作者： Yang Jialei Wang Fengyi Lei Yang Zhang Mingchao Sun Shiqiang Xu Wenfan Ke Jiaxiang Wu Haojie Li Xingyun Qi Jian Institute of materials for Energy and Environment College of Materials Science and EngineeringQingdao UniversityQingdao 266071China School of Chemistry and Chemical Engineering Hubei Key Laboratory of Coal Conversion and New Carbon MaterialsWuhan University of Science and TechnologyWuhan 430081China Department of Burn and Plastic Surgery Qingdao Municipal Hospital Affiliated to Rehabilitation UniversityQingdao 266000China State key laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Spinel oxide(NiCo_(2)O_(4))has demonstrated great potential to replace noble metal catalysts for the oxidation reaction of air pollutants.To further boost the oxidation ability of such catalysts,in this study,a facile surface-engineering strategy wherein NiCo_(2)O_(4) was treated with different alkali solvents was developed.The obtained catalyst(NiCo_(2)O_(4)-OH)showed a higher surface alkalinity and more surface defects compared to the pristine spinel oxide,including enhanced structural distortion as well as promoted oxygen vacancies.The propane oxidation ability of NiCo_(2)O_(4)-OH was greatly enhanced,with a propane conversion rate that was approximately 6.4 times higher than that of pristine NiCo_(2)O_(4) at a reaction temperature 193℃.This work sets a valuable paradigm for the surface modulation of spinel oxide via alkali treatment to ensure a high-performance oxidation catalyst.

关键词： NiCo_(2)O_(4) surface defects alkali treatment propane oxidation

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An ultra-porous g-C_(3)N_(4) micro-tube coupled with MXene(Ti_(3)C_(2)TX)nanosheets for efficient degradation of organics under natural sunlight

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Journal of Environmental Sciences 2024年第3期137卷 258-270页

作者： Zongyang Ya Qiyou Wang Jingjin Cai Peng Wang Xinyu Jiang Zhiyin Cai Shanglin Xiang Tingwei Wang Dongyu Cai College of materials Science&Engineering Nanjing Tech University30 South PuZhu RoadNanjing 211816China key laboratory of Flexible Electronics(KLOFE)&Institute of Advanced materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University30 South PuZhu RoadNanjing 211816China

It remains as a challenge for realizing efficient photo-responsive catalysts towards largescale degradation of organic pollutants under natural sunlight.This work reports a new pore engineering strategy for creating ultra-porous g-C_(3)N_(4) micro-tubes with an unprecedentedly high specific surface area of 152.96 m^(2)/g.This is mainly associated with releasing internal vapor pressure in the autoclave where the hydrothermal treatment of the urea/melamine mixture is processed.Supported by microscopic observation,porosity measurement and spectroscopic characterization,it is found that releasing the pressure at halfway of hydrothermal process is vital for forming exfoliated rod-like precursors and the de-aggregation of these rods presents substantial benefits on the production of mesopores on g-C_(3)N_(4) microtubes during the calcination of precursors.This offers a large number of reactive sites required by photocatalytic reaction.Coupling these micro-tubes with Ti_(3)C_(2)T_(X) nanosheets via electrostatic interaction yields a 1D/2D heterojunction with a close interfacial contact.The addition of metallically conductive Ti_(3)C_(2)T_(X) nanosheets accelerates the separation between electrons and holes,and also enhances the light absorption.All these merits of structural design lead to forming a group of highly efficient catalysts demonstrating an excellent photocatalytic degradation rate of k=0.0560 min^(-1)for RhB dyes under 100 mW/cm~2 visible light radiation that micks sunlight outdoors.This laboratory valuation is further supported by an outdoor test that shows a fast degradation rate of 0.0744 min^(-1)under natural sunlight.

关键词： Carbon nitride MXene Heterojunction Photocatalysis

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Design and fabrication of NiFe_(2)O_(4)/few-layers WS_(2) composite for supercapacitor electrode material

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Frontiers of materials Science 2023年第3期17卷 83-94页

作者： Xicheng Gao Jianqiang Bi Lulin Xie Chen Liu key laboratory for Liquid-Solid structural Evolution and processing of materials(Ministry of education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

Few-layers WS_(2) was obtained through unique chemical liquid exfoliation of commercial WS_(2).Results showed that after the exfoliation process,the thickness of WS_(2) reduced significantly.Moreover,the NiFe_(2)O_(4) nanosheets/WS_(2) composite was successfully synthesized through a facile hydrothermal method at 180°C,and then proven by the analyses of field emission scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The composite showed a high specific surface area of 86.89 m^(2)·g^(−1) with an average pore size of 3.13 nm.Besides,in the threeelectrode electrochemical test,this composite exhibited a high specific capacitance of 878.04 F·g^(−1) at a current density of 1 A·g^(−1),while in the two-electrode system,the energy density of the composite could reach 25.47 Wh·kg^(−1) at the power density of 70 W·kg^(−1) and maintained 13.42 Wh·kg^(−1) at the higher power density of 7000 W·kg^(−1).All the excellent electrochemical performances demonstrate that the NiFe_(2)O_(4) nanosheets/WS_(2) composite is an excellent candidate for supercapacitor applications.

关键词： WS_(2) chemical liquid exfoliation NiFe_(2)O_(4) composite supercapacitor

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Abnormal grain growth behavior and mechanism of 6005A aluminum alloy extrusion profile

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Journal of materials Science & Technology 2023年第26期157卷 42-59页

作者： Haixiao Zhao Lu Sun Guoqun Zhao Junquan Yu Fei Liu Ximan Sun Zhengfeng Lv Shanpeng Cao key laboratory for Liquid-Solid structural Evolution and processing of materials(Ministry of education) Shandong UniversityJinan 250061China Shandong Nanshan Aluminum Co. Ltd.Longkou 264000China

Peripheral coarse grain(PCG)structure is a common microstructural defect appearing in the aluminum alloy extrusion process,which seriously affects the mechanical properties of the profiles.In this work,a series of extrusion experiments and numerical simulations were conducted to investigate the influence of billet temperature and ram speed on the microstructure,mechanical properties and thickness of PCG layers of 6005A aluminum alloy profiles.The mechanism of abnormal grain growth(AGG)occurring on the surface and in the core of profiles was revealed.The result showed that lower ram speed could sup-press the formation of coarse grains.The AGG on the surface of the profiles was activated by the shear deformation and lattice distortion derived from the friction on the interface between the profile and die.When the billet was heated to a relatively high temperature,dynamic recrystallization(DRX)was dominant,and the Cube{100}and R-Cube{100}grains underwent abnormal growth to form surface coarse grains.When the billet was heated to a relatively low temperature,the degree of static recrystallization(SRX)became stronger,and the Goss{110}and R-Cube{100}grains under-went abnormal growth to form surface coarse grains.The AGG in the core of profiles was activated by the large grain boundary misorientation and a strain gradient formed because the Cube{100}re-crystallized grains were surrounded by the Copper{112}and Brass{110}deformed grains.The second phases in the 6005A aluminum alloy extrusion profiles were mainlyβ(Mg_(2) Si)and AlFeMnCrSi.As the billet temperature increased,moreβphases dissolved into the aluminum matrix,thus enhancing the strength and hardness of the profiles.As the ram speed decreased,the thickness of PCG layers reduced,thus resulting in higher strength and hardness of the profiles.Due to the integrated effect of solution strengthening and grain refinement strengthening mechanisms,the combination of extrusion parameters for the profile to obtain the best mechanical prope

关键词： Recrystallization Abnormal grain growth Microstructure Mechanical properties Solution strengthening Grain refinement strengthening

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Stable operation of polymer electrolyte-solid-state batteries via lonepair electron fillers

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Nano Research 2023年第11期16卷 12727-12737页

作者： Hongbin Liu Qing Sun Jun Cheng Hongqiang Zhang Xiao Xu Yuanyuan Li Zhen Zeng Yue Zhao Deping Li Jingyu Lu Lijie Ci State key laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Research Center for Carbon Nanomaterials Key Laboratory for Liquid–Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJinan 250061China College of materials and Chemistry China Jiliang UniversityHangzhou 310018China

Due to the increasing demand and wide applications of lithium-ion batteries,higher requirements have been placed on the energy density and safety.Polymer solid-state electrolytes have gained significant popularity due to their excellent interface compatibility and safety.However,their applications have been greatly restricted by the high crystallinity at room temperature,which hinders the transport of lithium ions.Herein,we utilize inorganic tubular fillers with abundant lone-pair atoms to reduce the crystallinity of the polyethylene oxide(PEO)solid-state electrolyte membrane and improve its ionic conductivity at room temperature,enabling stable operation of the battery.The tubular lone-pair-rich inorganic fillers play a key role in providing avenues for both internal and external charge transportation.The surface lone-pair electrons facilitate the dissociation and transport of lithium ions,while the internally tubular electron-rich layer attracts ions into the cavities,further enhancing the ion transport.After 100 cycles at room temperature,the lithium battery loaded with this solid-state electrolyte membrane delivers a specific capacity of 141.6 mAh·g−1,which is 51.3%higher compared to the membrane without the fillers.

关键词： nanotube filler polymer electrolyte ion transport room temperature(RT)operation

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Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 339-349页

作者： Hang Zhang Haipeng Li Rongguang Li Boshu Liu Ruizhi Wu Dongyue Zhao Shanshan Li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China key laboratory of Superlight materials&surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Magnesium(Mg)alloys are the lightest metal structural material for engineering applications and therefore have a wide market of applications.However,compared to steel and aluminum alloys,Mg alloys have lower mechanical properties,which greatly limits their application.Extrusion is one of the most important processing methods for Mg and its alloys.However,the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking investigation.In this work,commercial AZ80 alloys with different initial microstructures(as-cast and as-homogenized)were selected and extruded at a low extrusion temperature of 220℃and a low extrusion ratio of 4.The microstructure and mechanical properties of the two extruded AZ80 alloys were investigated.The results show that homogenized-extruded(HE)sample exhibits higher strength than the cast-extruded(CE)sample,which is mainly attributed to the high number density of fine dynamic precipitates and the high fraction of recrystallized ultrafine grains.Compared to the coarse compounds existing in CE sample,the fine dynamical precipitates of Mg17(Al,Zn)12form in the HE sample can effectively promote the dynamical recrystallization during extrusion,while they exhibit a similar effect on the size and orientation of the recrystallized grains.These results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

关键词： Magnesium alloy Low temperature and low ratio extrusion Bimodal grain structure Dynamic precipitate Dynamic recrystallization

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