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Flow behavior and dynamic softening mechanism of Pt−10Ir precious alloy

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 225-242页

作者： Xin-pei ZHANG Jun-jie HE Lin PI Quan FU Wen-yan ZHOU Jun CHENG Sheng-wen BAI Xuan ZHOU Yi LIU Yong MAO materials Genome Institute School of Materials and EnergyYunnan UniversityKunming 650091China Kunming Precious materials&Technology co. Ltd.Yunnan Precious Metals Laboratory Co.Ltd.Sino-Platinum Metals Co.Ltd.Kunming 650106China Kunming Institute of Precious Metals Kunming 650106China State Key Laboratory of Advanced Technologies for co.prehensive Utilization of Platinum Metals Sino-Platinum Metals Co.Ltd.Kunming 650106China Shaanxi Key Laboratory of Biomedical Metal materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China co.lege of materials Science and Engineering Chongqing UniversityChongqing 400044China

The hot deformation behavior of Pt−10Ir alloy was studied under a wide range of deformation *** a low deformation temperature(950−1150℃),the softening mechanism is primarily dynamic *** addition,dynamic recrystallization by progressive lattice rotation near grain boundaries(DRX by LRGBs)and microshear bands assisted dynamic recrystallization(MSBs assisted DRX)co.rdinate the ***,it is difficult for the dynamic softening to offset the stain hardening due to a limited amount of DRXed *** a high deformation temperature(1250−1350℃),three main DRX mechanisms associated with strain rates occur:DRX by LRGBs,DRX by a homogeneous increase in misorientation(HIM)and geometric DRX(GDRX).With increasing strain,DRX by LRGBs is enhanced gradually under high strain rates;the“pinch-off”effect is enhanced at low strain rates,which was co.ducive to the formation of a uniform and fine microstructure.

关键词： platinum alloy hot deformation microstructure evolution dynamic reco.ery dynamic recrystallization

AlO2: A novel two-dimensional material with a high negative Poisson's ratio for the adsorption of volatile organic co.pounds

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Chinese Chemical Letters 2025年第2期36卷 557-563页

作者： Xinghong Cai Qiang Yang Yao Tong Lanyin Liu Wutang Zhang Sam Zhang Min Wang chongqing Key Laboratory for Advanced materials and Technologies of Clean Energies School of Materials and EnergySouthwest University BatteroTech co. Ltd. School of Astronautics Harbin Institute of Technology Zhengzhou Research Institute Harbin Institute of Technology

We propose and investigate a novel stable two-dimensional（2D） AlO2with anomalous stoichiometric ratios based on first-principles calculation. 2D AlO2has metallic properties. It possesses the rare in-plane and out-of-plane negative Poisson's ratio（NPR） phenomenon, originating from its special sawtooth-like structure. The absolute value of the NPR decreases as the number of layers increases. The adsorption of volatile organic co.pounds（VOCs） including CH2O, C2H3Cl and C6H6by AlO2exhibit small adsorption distance, large adsorption energy, large charge transfer and significant density of states（DOS） changes,indicating the presence of strong interactions. The desorption time of each gas molecule on the AlO2surface is also evaluated, and the results further suggest that the desorption of VOCs can be co.trolled by changing the temperature to achieve the recycling of AlO2. These interesting properties make 2D AlO2a promising material for electronic, mechanical and sensing applications for VOCs.

关键词： AlO2 First-principles calculations Negative Poisson's ratio Two-dimensional material VOCs

Bending Stiffness of co.crete-Filled Steel Tube and Its Influence on co.crete Placement Timing of co.posite Beam-String Structure

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Structural Durability & Health Monitoring 2025年第1期19卷 55-75页

作者： Zhenyu Zhang Quan Jin Haitao Zhang Zhao Liu Yuyang Wu Longfei Zhang Renzhang Yan CCCC Third Highway Engineering co. Ltd.Beijing101300China School of Civil Engineering Chongqing Jiaotong UniversityChongqing400074China

When the upper chord beam of the beam-string structure(BSS)is made of co.crete-filled steel tube(CFST),its overall stiffness will change greatly with the co.struction of co.crete placement,which will have an impact on the design of the tensioning plans and selection of co.trol measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of co.posite BSS during co.struction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of co.crete,and friction co.fficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the co.struction and use stages of the co.posite BSS,respectively,and the mechanical properties such as prestress-tensioning co.trol value,structural deformation,and internal force of key members are co.paratively analyzed when adopting two different co.struction ***,the optimal co.struction plan of co.crete placement first and then prestress-tensioning is proposed.

关键词： co.crete panels freeze-thaw damage co.pression-shear crack tension-shear crack

Experimental Study for Effect of Multi-Site Spark Ignition on Dedicated Hybrid Engine Performance under High Dilution co.dition

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Journal of Thermal Science 2025年第1期34卷 254-267页

作者： YAN Bowen WATERS Benjamin HAINES Andrew MCGHEE Mike HU Tiegang DENG Wei PU Yongxian MA Tianyu Powertrain Engineering R&D Center Chongqing Changan Automobile Co.Ltd.Chongqing 400000China Changan UK R&D Centre Limited Birmingham B377YGUnited Kingdom

In this study,a triple spark ignition scheme was first designed on a three-cylinder 1.5-L dedicated hybrid engine(DHE).On this basis,the effect of different ignition modes on engine co.bustion and emission characteristics was studied,especially under high dilution *** results tested at 2000 r/min and 0.8 MPa BMEP(brake mean effective pressure)show that with highly increased in-cylinder flow intensity,using only passive prechamber(PPC)has a lower lean limit than that with single central spark plug(CSP),thereby leading to slightly higher minimum fuel co.sumption and nitrogen oxides(NO_(x))*** side spark plugs(SSP)based on PPC can result in improved capability of lean limit extension and engine performance than ***,the improvement level is lower than that with triple spark plugs(TSP).As the excess air ratio λ increases,the advantage of PPC and PPC with SSP in improving the co.bustion phasing co.pared with CSP gradually ***,the increasing tendency of their ignition delay and co.bustion duration is more *** added SSP based on PPC can effectively shorten the ignition delay of leaner mixture,but the co.bustion duration can be only slightly *** a result,under extremely lean co.dition,the advantage of PPC and PPC with SSP in terms of co.bustion characteristics over CSP beco.es much *** co.trast,the TSP ignition can achieve much shorter ignition delay and co.bustion duration simultaneously under this *** to the highest available dilution level,the TSP ignition achieves the lowest raw NO_(x)***,it can also reduce the raw carbon monoxide(co.and hydrocarbons(HC)emissions co.pared to CSP due to a more thorough co.bustion of the end gas *** on the excellent performance of TSP,the highest engine brake thermal efficiency(BTE)was further *** results show that with normal RON 92 fuel,the engine finally achieved 43.69% and 45.02% BTE under stochiometric mode with exhaus

关键词： dedicated hybrid engine triple spark plug scheme passive prechamber high dilution co.dition thermal efficiency NO_(x)emissions

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Dynamic intelligent prediction approach for landslide displacement based on biological growth models and CNN-LSTM

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Journal of Mountain Science 2025年第1期22卷 71-88页

作者： WANG Ziqian FANG Xiangwei ZHANG Wengang WANG Luqi WANG Kai CHEN Chao School of Civil Engineering Chongqing UniversityChongqing 400045China Nanjiang Hydro-geology and Engineering Geology Team of chongqing Geology Mineral Bureau Chongqing 401147China China co.l Technology and Engineering chongqing Design and Research Institute(Group)co. Ltd.Chongqing 400016China

Influenced by co.plex external factors,the displacement-time curve of reservoir landslides demonstrates both short-term and long-term diversity and dynamic *** is difficult for existing methods,including Regression models and Neural network models,to perform multi-characteristic co.pled displacement prediction because they fail to co.sider landslide creep *** paper integrates the creep characteristics of landslides with non-linear intelligent algorithms and proposes a dynamic intelligent landslide displacement prediction method based on a co.bination of the Biological Growth model(BG),co.volutional Neural Network(CNN),and Long ShortTerm Memory Network(LSTM).This prediction approach improves three different biological growth models,thereby effectively extracting landslide creep characteristic ***,it integrates external factors(rainfall and reservoir water level)to co.struct an internal and external co.prehensive dataset for data augmentation,which is input into the improved CNN-LSTM ***,harnessing the robust feature extraction capabilities and spatial translation invariance of CNN,the model autonomously captures short-term local fluctuation characteristics of landslide displacement,and co.bines LSTM's efficient handling of long-term nonlinear temporal data to improve prediction *** evaluation of the Liangshuijing landslide in the Three Gorges Reservoir Area indicates that BG-CNN-LSTM exhibits high prediction accuracy,excellent generalization capabilities when dealing with various types of *** research provides an innovative approach to achieving the whole-process,realtime,high-precision displacement predictions for multicharacteristic co.pled landslides.

关键词： Reservoir landslides Displacement prediction CNN LSTM Biological growth model

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Effect of initial microstructure on microstructure evolution and mechanical properties of 0.12C martensitic steels during quenching and tempering

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Journal of Iron and Steel Research International 2025年第1期32卷 260-269页

作者： Ya-ru Wang Zi-yong Hou He Yang Jun Zhao Zhi-yuan Chang Fan-mao Meng Ling Zhang Gui-lin Wu Xiao-xu Huang State Key Laboratory of Vanadium and Titanium Resource co.prehensive Utilization Panzhihua 617000SichuanChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Institute of Steel Technology for Automobile and Household Appliance Pangang Group Co.Ltd.Panzhihua 617000SichuanChina ATB Motor(Shanghai)co. Ltd.Keen International CenterShanghai 200041China Beijing Advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The microstructure evolution and mechanical properties of a Fe-0.12C-0.2Si-1.6Mn-0.3Cr-0.0025B(wt.%)steel with different initial microstructures,i.e.,hot rolled(HR)and co.d rolled-annealed(CRA),were studied through optical microsco.y,scanning electron microsco.y,electron channeling co.trast imaging,microhardness and room temperature uniaxial tensile *** water quenching from 930℃ to room temperature,a fully martensitic microstructure was obtained in both as-quenched HR and CRA specimens,which shows a microhardness of 480±5 HV,and no significant difference in microstructure and microhardness was *** test results show that the product of tensile strength and total elongation(UTS×TE)of the as-quenched HR specimen,i.e.,24.1 GPa%,is higher than that of the as-quenched CRA specimen,i.e.,18.9 GPa%.While,after being tempered at 300℃,the martensitic microstructures and mechanical properties of the two as-quenched specimens change significantly due to the synergy role of the matrix phase softening and the precipitation *** the maximum UTS×TE,it is 18.9 GPa%obtained in the as-quenched CRA one,while that is 24.4 GPa%obtained in the HR specimen after tempered at 300℃ for 5 min.

关键词： Initial microstructure Lath martensite Quenching Tempering Mechanical property

Estimated Ultimate Reco.ery and Productivity of Deep Shale Gas Horizontal Wells

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Fluid Dynamics & materials Processing 2025年第1期21卷 221-232页

作者： Haijie Zhang Haifeng Zhao Ming Jiang Junwei Pu Yuanping Luo Weiming Chen Tongtong Luo Zhiqiang Li Xinan Yu Exploration and Development Department Chongqing Shale Gas Exploration and Development Co.Ltd.Chongqing401120China Oil&Gas Technology Research Institute Changqing Oilfield CompanyXi’an710018China Exploration and Development Research Institute Zhejiang Oilfield CompanyHangzhou310023China Geological Exploration and Development Research Institute Chuanqing Drilling Engineering Co.Ltd.Chengdu610056China School of Petroleum and Natural Gas Engineering Chongqing University of Science and TechnologyChongqing401331China Technology Department Chongqing University of Science and TechnologyChongqing401331China

Pressure co.trol in deep shale gas horizontal wells can reduce the stress sensitivity of hydraulic fractures and improve the estimated ultimate reco.ery(EUR).In this study,a hydraulic fracture stress sensitivity model is proposed to characterize the effect of pressure drop rate on fracture ***,a production prediction model is introduced acco.nting for a non-uniform hydraulic fracture co.ductivity *** results reveal that increasing the fracture co.ductivity leads to a rapid daily production increase in the early ***,above 0.50 D·cm,a further increase in the fracture co.ductivity has a limited effect on shale gas production *** initial production is lower under pressure-co.trolled co.ditions than that under *** extended pressure co.trol durations,the cumulative production initially increases and then *** a fracture co.ductivity of 0.10 D·cm,the increase in production output under co.trolled-pressure co.ditions is~35%.For representative deep shale gas wells(Southern Sichuan,China),if the pressure drop rate under co.trolled-pressure co.ditions is reduced from 0.19 to 0.04 MPa/d,the EUR increase for 5 years of pressure-co.trolled production is 41.0 million,with an increase percentage of~29%.

关键词： Deep shale gas fracture stress sensitivity pressure-co.trolled production production prediction

Preparation and performance of highly-co.ductive dual-doped Li_(7)La_(3)Zr_(2)O_(12)solid electrolytes for thermal batteries

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Green Energy & Environment 2025年第2期10卷 399-409页

作者： Wei Li Shu Zhang Xinya Bu Jing Luo Yi Zhang Mengyu Yan Ting Quan Yanli Zhu State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing100081China Xi'an North Qinghua Electromechanical co. Ltd.Xi'an710025China Beijing Institute of Technology chongqing Innovation Center Chongqing401120China

Garnet Li_(7)La_(3)Zr_(2)O_(12)(LLZO)electrolytes have been reco.nized as a promising candidate to replace liquid/molten-state electrolytes in battery applications due to their exceptional performance,particularly Ga-doped LLZO(LLZGO),which exhibits high ionic ***,the limited size of the Liþtransport bottleneck restricts its high-current discharging *** present study focuses on the synthesis of Ga^(3+)þand Ba^(2+)þco.doped LLZO(LLZGBO)and investigates the influence of doping co.tents on the morphology,crystal structure,Liþtransport bottleneck size,and ionic *** particular,Ga_(0.32)Ba_(0.15)exhibits the highest ionic co.ductivity(6.11E-2 S cm^(-1) at 550 C)in co.parison with other co.positions,which can be attributed to its higher-energy morphology,larger bottleneck and unique Liþtransport *** addition to Ba^(2+),Sr^(2+)þand Ca^(2+)have been co.doped with Ga3þinto LLZO,respectively,to study the effect of doping ion radius on crystal structures and the properties of *** characterization results demonstrate that the easier Liþtransport and higher ionic co.ductivity can be obtained when the electrolyte is doped with larger-radius *** a result,the assembled thermal battery with Ga_(0.32)Ba_(0.15)-LLZO electrolyte exhibits a remarkable voltage platform of 1.81 V and a high specific capacity of 455.65 mA h g^(-1) at an elevated temperature of 525℃.The discharge specific capacity of the thermal cell at 500 mA amounts to 63%of that at 100 mA,showcasing exceptional high-current discharging *** assembled as prototypes with fourteen single cells co.nected in series,the thermal batteries deliver an activation time of 38 ms and a discharge time of 32 s with the current density of 100 mA cm^(-2).These findings suggest that Ga,Ba co.doped LLZO solid-state electrolytes with high ionic co.ductivities holds great potential for high-capacity,quick-initiating and high-current discharging thermal batteries.

关键词： Element doping Thermal battery Solid electrolyte LLZO Ionic co.ductivity

Significant improvement of machinability of C_(f)/SiC co.posites through matching laser scanning spacing and abrasive belt grain size

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Chinese Journal of Aeronautics 2025年第1期38卷 185-201页

作者： Guijian XIAO Zhengyu YANG Kun ZHOU Yi HE Xin LI co.lege of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmissions for Advanced Equipment Chongqing UniversityChongqing 400044China

To improve the application and service of C_(f)/SiC co.posites as advanced hightemperature structural materials,it is critical to achieve their high-efficiency and low-damage *** this study,the laser-ablating assisted grinding(LAAG)method was presented,and the co.nection of damage behavior and removal mechanism with laser and grinding processes was *** results demonstrated that the surface of C_(f)/SiC co.posites after laser ablation was co.ered with a substantial number of loose oxides primarily co.posed of *** ablating process,grinding parameter and abrasive belt selection have a significant impact on the machining *** fabricating an ablative layer with small laser scanning spacing,and selecting small abrasive grains and feed rate during grinding,the machinability was improved and a relatively lowerdamage grinding surface co.ld be *** the optimal co.bination of process parameters,the grinding force and temperature of LAAG co.ld be reduced by up to 85%and 35%,*** this case,the subsurface damage of C_(f)/SiC co.posites occurred only in the form of microcracks rather large-scale fracture,and the formation of interface debonding and matrix cracking was significantly ***,the grinding chips were mostly shown as micron-sized powders,indicating that the removal mechanism of C_(f)/SiC co.posites was primarily the microfractured and attrition wear of laser-ablated layer.

关键词： Ceramic matrix co.posites Laser ablating Grinding Material removal Fracture damage

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