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A coupled IBM/Euler-Lagrange framework for simulating shock-induced particle size segregation 被引量:1
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作者 Archana Sridhar Jesse Capecelatro 《Acta Mechanica Sinica》 2026年第1期35-48,共14页
We present a numerical framework for simulating viscous compressible flows in the presence of solid particles with large size ratios.The volume-filtered Navier-Stokes equations are discretized using a class of high-or... We present a numerical framework for simulating viscous compressible flows in the presence of solid particles with large size ratios.The volume-filtered Navier-Stokes equations are discretized using a class of high-order low-dissipative finite difference operators with energy-preserving properties.No-slip,adiabatic boundary conditions are enforced at the surface of large particles(with diameters significantly larger than the local grid spacing)using a ghost-point immersed boundary method.Two-way coupling between the gas phase and small particles(with diameters proportional to the grid spacing)is accounted for through volumetric source terms for interphase momentum and energy exchange.A simple and efficient approach for collision detection between small and large particles is proposed.The framework is applied to simulations of planar shocks interacting with bidisperse distributions of particles with size ratios of approximately thirty.Particle dispersion and size segregation are reported and a simple analytical model for size segregation is proposed. 展开更多
关键词 PARTICLE BIDISPERSE segregation Shock Immersed boundary EULER-LAGRANGE
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Effect of Channel Segregation on Microstructure and Mechanical Properties of Ti45Nb Alloy Wire
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作者 Shang Jinjin Yang Hui +6 位作者 Bai Huiwen Wu Yulun Zhao Xiaohua Lei Qiang He Tao Liu Xianghong Zeng Weidong 《稀有金属材料与工程》 北大核心 2026年第4期869-876,共8页
The effects of channel segregation on the macro-and micro-scale chemical composition,microstructure,hardness,and tensile deformation behavior of Ti45Nb wires were investigated.The results show that wires with severe c... The effects of channel segregation on the macro-and micro-scale chemical composition,microstructure,hardness,and tensile deformation behavior of Ti45Nb wires were investigated.The results show that wires with severe channel segregation exhibit a macroscopic chemical composition identical to those without segregation,and 3D X-ray imaging result also reveals no abnormalities.After annealing,both types of wires exhibit an equiaxed single-phase microstructure with comparable grain sizes,suggesting that channel segregation has negligible influence on the macroscopic composition and grain size.Metallographic examination reveals that channel segregation manifests as spot-like features in the transverse section and band-like structures in the longitudinal section.EDS analysis identifies these regions as Ti-enriched segregations,with a Ti content higher than that of the surrounding matrix by approximately 4.42wt%.Compared to segregation-free wires,those containing extensive channel segregation demonstrate a 15.5%increase in ultimate tensile strength and a 12.3%increase in yield strength,but suffer a reduction in elongation and reduction of area by 19.8%and 18.9%,respectively.Furthermore,the mechanical properties of wires with segregation show significant fluctuations.Fractographic analysis reveals a larger fracture surface area in segregated wires.Severe dislocation pile-ups occur at the interfaces of these segregated regions,initiating microcrack nucleation.This promotes rapid crack propagation of the Ti45Nb wire,leading to a significant decrease in plasticity and reduction of area. 展开更多
关键词 Ti45Nb alloy channel segregation mechanical properties
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Cohesin variants and meiotic timing shape chromosome segregation accuracy
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作者 Yuanyuan Liu Bohan Liu +6 位作者 Shuo Wang Li Zhao Qian Li Feifei Qi Ruoxi Wang Jun Zhou Jinmin Gao 《Journal of Genetics and Genomics》 2026年第2期293-304,共12页
The frequency of aneuploid gamete formation increases with maternal age,yet the effects of genetic variants on meiotic chromosome segregation accuracy during aging remain poorly understood.Using the multicellular orga... The frequency of aneuploid gamete formation increases with maternal age,yet the effects of genetic variants on meiotic chromosome segregation accuracy during aging remain poorly understood.Using the multicellular organism Caenorhabditis elegans,we investigate the impact of mutations in the conserved cohesin complex on age-associated meiotic errors.Point mutations in the head domain of the cohesin component SMC-1,which alter local hydrophobicity,cause meiotic defects that vary with age.A severe mutation causes incomplete synapsis and defective crossover formation,and a minor one causes age-related diakinesis bivalent abnormalities.Notably,while the mild mutation causes defects only in aged worms,worms with the severe mutation exhibit significantly alleviated phenotypes with age.Genetic and cytological analyses suggest that this alleviation results from a slowed meiotic progression during early prophase,which restores impaired cohesin loading.These findings reveal that cohesin variants,meiotic progression speed during early prophase,and the overall duration of meiosis collectively shape the accuracy of meiotic chromosome segregation. 展开更多
关键词 MEIOSIS Chromosome segregation COHESIN SMC-1 Reproductive aging Caenorhabditis elegans
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Effect of cooling rate on solidification behavior and micro-segregation of high-alloyed wrought superalloy GH4975
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作者 Guang-di Zhao Xi-min Zang +1 位作者 Yi-xuan Sun Xiao-yu Yao 《China Foundry》 2026年第1期83-93,共11页
The high-alloyed wrought superalloy GH4975 tends to form coarse MC carbides and eutectic(γ+γ′)phases,which adversely affect the cogging and homogenization process.To provide theoretical guidance for control of MC c... The high-alloyed wrought superalloy GH4975 tends to form coarse MC carbides and eutectic(γ+γ′)phases,which adversely affect the cogging and homogenization process.To provide theoretical guidance for control of MC carbides and eutectic(γ+γ′)formation,differential thermal analysis(DTA)was utilized to investigate the effect of cooing rate(10-90℃·min^(-1))on solidification behavior and micro-segregation of GH4975 alloy.According to the thermodynamic calculation and distribution characteristics of precipitates,the MC carbides can act as nucleation sites forγdendrites,but the nucleation ofγdendrites becomes less dependent on the MC carbide primers at higher cooling rates.As theγdendrites grow,the elements including Ti and Nb gradually accumulate in the residual liquid and leads to the formation of more MC carbides near the interdendritic region.Finally,the solidification is terminated with the formation of eutectic(γ+γ′).With an increase in cooling rate,the liquidus temperature rises,but the solidus temperature decreases,and thus the solidification range is obviously enlarged.The dendritic structure is significantly refined by the increase of cooling rate.The secondary dendrite arm spacing,λ_(2),as a function of cooling rate,T,can be expressed asλ_(2)=216.78T^(-0.42).Moreover,the increasing cooling rate weakens the back diffusion of Al,Ti,and Nb,increases the undercooling,and limits the growth of precipitates.Consequently,the sizes of MC carbides,eutectic(γ+γ′),and primaryγ′significantly decrease,but the area fraction of eutectic(γ+γ′)linerly increases as the cooling rate rises.Thus moderate cooling rate(such as 30℃·min^(-1))should be selected during the solidification process of GH4975 alloy. 展开更多
关键词 Ni-based superalloy cooling rate solidification segregation MC carbides eutectic(γ+γ′)
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Influence of interfacial segregation of Sn microalloying on internal oxidation of Fe-Mn-Si based alloys
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作者 Wen-Tao Zhang Yi-Ming Liu +4 位作者 Qin Luo Wei-Chen Mao Ju-Feng Hong Xin-Yan Jin Guang-Xin Wu 《Journal of Iron and Steel Research International》 2026年第3期31-44,共14页
Severe internal oxidation formed in advanced high-strength steels(AHSSs)during the hot-rolled coiling process compromises subsequent cold rolling and galvanizing processes.Herein,we report how Sn microalloying governs... Severe internal oxidation formed in advanced high-strength steels(AHSSs)during the hot-rolled coiling process compromises subsequent cold rolling and galvanizing processes.Herein,we report how Sn microalloying governs internal oxidation behavior and modulates iron oxide phase transition process.Sn addition significantly reduces the depth of grain boundaries oxidation and the area of internal oxidation,as well as retards the process of oxide scale transformation.Sn preferentially segregates at the iron oxide/substrate interface,forming a diffusion barrier that suppresses outward diffusion of alloying elements and inward oxygen transport.Concurrently,Sn enrichment at grain boundaries obstructs short-circuit oxygen diffusion pathways,significantly reducing the depth of oxidation at the grain boundaries.Furthermore,Sn segregation decreases the interfacial oxygen chemical potential and oxygen availability for selective oxidation reaction.The strategic incorporation of surface-active elements has emerged as a viable metallurgical approach to reduce internal oxidation in hot-rolled coils for AHSS applications. 展开更多
关键词 Sn microalloying Interface segregation Oxidation kinetics Grain boundaries oxidation Hot-rolled coil
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Characterizing dynamic segregation behavior in cemented paste during pipeline transport through electrical resistance tomography
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作者 Yingjie Chang Aixiang Wu +4 位作者 Zhu’en Ruan Shaoyong Wang Jiandong Wang Shulong Liu Shuangcheng Du 《International Journal of Minerals,Metallurgy and Materials》 2026年第3期798-808,共11页
Cement paste backfill(CPB)technology is a key method for mine waste treatment,and pipeline transport is critical for safe and efficient waste transfer.Variations in raw material properties can cause slurry segregation... Cement paste backfill(CPB)technology is a key method for mine waste treatment,and pipeline transport is critical for safe and efficient waste transfer.Variations in raw material properties can cause slurry segregation,increase pipeline wear and resistance,raise the risk of blockages or bursts,and disrupt operations.To study CPB slurry segregation during transport,CPB was prepared using cement as the cementitious material and unclassified tailings as inert materials.A small annular-tube device using an electrical resistance tomography system was developed to analyze its flow characteristics,and quantitative segregation assessment methods were developed.The results indicated that CPB conductivity increases with transport time but decreases with higher solid mass content,with the latter having a greater impact.At a low solid content,solid particles migrated toward the bottom of the pipe as the flow time increased,and the migratory behavior of the particles diminished as the solid content increased.At a flow rate of 1.25 m/s,the heterogeneity index for CPB with 58wt% solid content increased by 1.24 in 20 min,whereas that for CPB with 62wt% solid content increased by 2.17.Higher solid mass content amplifies the effect of conveying time on segregation,emphasizing the need to balance these factors for minimizing segregation.These insights can guide the optimization of mine pipeline transport systems. 展开更多
关键词 cement paste backfill electrical resistance tomography dynamic segregation pipeline transport
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Dynamic covalent bond-mediated suppression of phase segregation in wide-bandgap perovskites
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作者 Xiyue Wang Na Wang +4 位作者 Xinyu Yuan Mengyao Guo Jinling Zhang Yanlin Song Ziqiu Ren 《Journal of Energy Chemistry》 2026年第3期217-227,共11页
Phase segregation triggered by illumination is a typical stimulus response in wide-bandgap perovskites,and addressing it is vital for overcoming the stability bottleneck of perovskite devices by mitigating phase segre... Phase segregation triggered by illumination is a typical stimulus response in wide-bandgap perovskites,and addressing it is vital for overcoming the stability bottleneck of perovskite devices by mitigating phase segregation and implementing dynamic management.To tackle this,a dynamic covalent bond-mediated approach is proposed to deal with phase segregation in wide-bandgap perovskites.Results show that adding dynamic disulfide and diselenide bonds effectively suppresses phase segregation while keeping halogen homogeneity.A 1.77 eV wide-bandgap perovskite device attains a peak conversion efficiency of 21.02% and retains over 90% of its initial efficiency after 1200 h of continuous illumination at the maximum power point.A fabricated perovskite/perovskite tandem device reaches an optimal conversion efficiency of 28.45%.Incorporating dynamic covalent bonds presents a new strategy for mitigating phase segregation in wide-bandgap perovskites and is expected to drive further progress in this area. 展开更多
关键词 Wide-bandgap perovskites Phase segregation Dynamic covalent bonds Illumination stability All-perovskite tandem device
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Effect of alloying element segregation inheritance on microstructure and properties of low carbon microalloyed steel
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作者 Yong-Kun Yang Zi-Yi Ge +3 位作者 Chuang Feng Guo-Xing Qiu Xiao-Ming Li Dong-Ping Zhan 《Journal of Iron and Steel Research International》 2026年第1期78-86,共9页
The microstructure and mechanical properties of Ti-Zr deoxidized low carbon microalloyed steel after‘quenching+tempering’(Q+T)and‘quenching+intercritical quenching+tempering’(Q+IQ+T)heat treatment were analyzed us... The microstructure and mechanical properties of Ti-Zr deoxidized low carbon microalloyed steel after‘quenching+tempering’(Q+T)and‘quenching+intercritical quenching+tempering’(Q+IQ+T)heat treatment were analyzed using the metallographic microscope,scanning electron microscope,electron probe microanalyzer,electronic universal testing machine and impact testing machine.The effect of element segregation band after hot rolling on the anisotropy of microstructure and mechanical properties of subsequent heat treatment was investigated.The results show that the essence of improving the banded structure by oxide metallurgy technology in the hot rolling process is to promote the formation of intragranular ferrite to break the bainite band,but the element segregation band produced during hot rolling will be inherited to the subsequent heat treatment process.After Q+T heat treatment,the microstructure is mainly martensite,and there is no obvious banded structure.The shear transformation of martensite weakens the influence of alloying element segregation and avoids the directionality of microstructure and the anisotropy of mechanical properties.After Q+IQ+T heat treatment,the martensite/ferrite bands or continuous martensite bands appear in the microstructure,and with the increase in intercritical quenching temperature,continuous martensite bands become more obvious.The appearance of banded structure aggravates the difference of mechanical properties in all directions,especially the difference of plasticity and toughness in longitudinal and transverse directions.Therefore,the banded structure can be avoided by regulating the nucleation rate difference between the element enrichment and depleted zones during the heat treatment process.The alloying elements segregation is a necessary condition for the formation of banded structure after heat treatment,but it is not a sufficient condition. 展开更多
关键词 Alloying element segregation inheritance Heat treatment MICROSTRUCTURE Mechanical property Low carbon microalloyed steel
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Effect of atomic structure on migration characteristic and solute segregation of ordered domain interfaces formed in Ni_(75)Al_xV_(25-x) 被引量:2
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作者 张明义 陈铮 +3 位作者 王永欣 马光 卢艳丽 范晓丽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期604-611,共8页
Based on the microscopic phase-field model, ordered domain interfaces formed between D022 (Ni3V) phases along [001] direction in Ni75AlxV25-x alloys were simulated, and the effects of atomic structure on the migrati... Based on the microscopic phase-field model, ordered domain interfaces formed between D022 (Ni3V) phases along [001] direction in Ni75AlxV25-x alloys were simulated, and the effects of atomic structure on the migration characteristic and solute segregation of interfaces were studied. It is found that the migration ability is related to the atomic structure of interfaces, and three kinds of interfaces can migrate except the interface (001)//(002) which has the characteristic of L12 (Ni3Al) structure. V atoms jump to the nearest neighbor site and substitute for Ni, and vice versa. Because of the site selectivity behaviors of jumping atoms, the number of jumping atoms during the migration is the least and the jumping distance of atoms is the shortest among all possible modes, and the atomic structures of interfaces are unchanged before and after the migration. The preferences and degree of segregation or depletion of alloy elements are also related to the atomic structure of interface. 展开更多
关键词 atomic migration characteristic solute segregation site selectivity microscopic phase-field ordered domain interface
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Formation and solute segregation for an asymmetric tilt boundary on{1012}twin boundaries 被引量:1
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作者 Qiang Yang Shuhui Lv +3 位作者 Peng Chen Zefeng Xie Shuo Zhou Xin Qiu 《Journal of Magnesium and Alloys》 2025年第2期583-591,共9页
Asymmetric tilt boundaries on conventional twin boundaries(TBs)are significant for understanding the role of twins on coordinating plastic deformation in many metallic alloys.However,the formation modes of many asymme... Asymmetric tilt boundaries on conventional twin boundaries(TBs)are significant for understanding the role of twins on coordinating plastic deformation in many metallic alloys.However,the formation modes of many asymmetric tilt boundaries are hard to be accounted for based on traditional theoretical models,and the corresponding solute segregation is complex.Herein,atomic structures of a specific asymmetric boundary on{1012}TBs were reveled using aberration-corrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),molecular dynamics(MD)and density functional theory(DFT)simulations.Reaction between<a60>M dislocations and the{1012}TB can generate a~61°/25°asymmetric tilt boundary.The segregation of Gd and Zn atoms is closely related to the aggregateddislocations and the interfacial interstices of the asymmetric tilt boundary,which is energetically favorable in reducing the total system energy. 展开更多
关键词 Magnesium alloy Transmission electron microscopy Twin boundary DISLOCATION segregation
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Effective suppression of surface cation segregations on double perovskite oxides through entropy engineering 被引量:1
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作者 Zhe Wang Mengke Yuan +5 位作者 Juntao Gao Hongru Hao Jingwei Li Lingling Xu Zhe Lv Bo Wei 《Journal of Rare Earths》 2025年第2期345-353,I0005,共10页
Cation segregation on cathode surfaces plays a key role in determining the activity and operational stability of solid oxide fuel cells(SOFCs).The double perovskite oxide PrBa_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(PBCC)has been... Cation segregation on cathode surfaces plays a key role in determining the activity and operational stability of solid oxide fuel cells(SOFCs).The double perovskite oxide PrBa_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(PBCC)has been widely studied as an active cathode but still suffer from serious detrimental segregations.To enhance the cathode stability,a PBCC derived A-site medium-entropy Pr_(0.6)La_(0.1)Nd_(0.1)Sm_(0.1)Gd_(0.1)Ba_(0.8)Ca_(0.2)Co_(2)O_(5+δ)(ME-PBCC)oxide was prepared and its segregation behaviors were investigated under different conditions.Compared with initial PBCC oxide,the segregations of BaO and Co_(3)O_(4)on the surface of ME-PBCC material are significantly suppressed,especially for Co_(3)O_(4),which is attributed to its higher configuration entropy.Our results also confirm the improved electrochemical performance and structural stability of ME-PBCC material,enabling it as a promising cathode for SOFCs. 展开更多
关键词 Solid oxide fuel cells CATHODE Double perovskite Configuration entropy Cation segregation Rare earths
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Segregation behaviors in{101^(-)1}compressive twin boundaries of Mg-RE alloy under deformation at room temperature 被引量:1
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作者 Yujie Cui Lili Guo +6 位作者 Yunwei Gui Kenta Aoyagi Haotian Tong Qinqin Wei Fangzhou Liu Yuichiro Hayasaka Akihiko Chiba 《Journal of Magnesium and Alloys》 2025年第1期330-337,共8页
Solute atoms and precipitates significantly influence the mechanical properties of Mg alloys.Previous studies have mainly focused on the segregation behaviors of Mg alloys after annealing.In this study,we investigated... Solute atoms and precipitates significantly influence the mechanical properties of Mg alloys.Previous studies have mainly focused on the segregation behaviors of Mg alloys after annealing.In this study,we investigated the segregation behaviors of an Mg-RE alloy under deformation.We found that the enrichment of solute atoms occurred in{101^(-)1}compressive twin boundaries under compression at 298 K without any annealing in an Mg-RE alloy by scanning transmission electron microscopy and energy-dispersive X-ray analysis.The segregated solutes and precipitates impeded the twin growth,partially contributing to the formation of small-sized{101^(-)1}compressive twins.This research indicates the twin boundaries can be strengthened by segregated solutes and precipitates formed under deformation at room temperature. 展开更多
关键词 Magnesium alloys Compression test Scanning/transmission electron microscopy(STEM) segregation Twin boundaries
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Atomic-scale insights into microscopic mechanisms of grain boundary segregation in Al−Cu alloys 被引量:1
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作者 Xiong SHUAI Hong MAO +2 位作者 Sai TANG Yi KONG Yong DU 《Transactions of Nonferrous Metals Society of China》 2025年第1期1-12,共12页
This study aims to clarify the mechanisms for the grain boundary(GB)segregation through investigating the absorption of excess solute atoms at GBs in Al−Cu alloys by using the hybrid molecular dynamics/Monte Carlo sim... This study aims to clarify the mechanisms for the grain boundary(GB)segregation through investigating the absorption of excess solute atoms at GBs in Al−Cu alloys by using the hybrid molecular dynamics/Monte Carlo simulations.Two segregation mechanisms,substitutional and interstitial mechanisms,are observed.The intergranular defects,including dislocations,steps and vacancies,and the intervals in structural units are conductive to the prevalence of interstitial mechanism.And substitutional mechanism is favored by the highly ordered twin GBs.Furthermore,the two mechanisms affect the GB structure differently.It is quantified that interstitial mechanism is less destructive to GB structure than substitutional one,and often leads to a segregation level being up to about 6 times higher than the latter.These findings contribute to atomic scale insights into the microscopic mechanisms about how solute atoms are absorbed by GB structures,and clarify the correlation among intergranular structures,segregation mechanisms and kinetics. 展开更多
关键词 grain boundaries segregation Al−Cu alloy intergranular structure molecular dynamics simulation Monte Carlo simulation
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Effects of Mg on P Segregation at α-Fe Σ3(111) GB
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作者 Wang Pengjia Ma Yuning +3 位作者 Peng Baoying Lin Kun Li Xiaobing Liu Kui 《稀有金属材料与工程》 北大核心 2025年第5期1156-1164,共9页
First-principles theory calculations were used to investigate the segregation behavior of P and Mg as well as the interactions between Mg and P atα-FeΣ3(111)[11¯0]symmetrical tilt grain boundary(GB).Results dem... First-principles theory calculations were used to investigate the segregation behavior of P and Mg as well as the interactions between Mg and P atα-FeΣ3(111)[11¯0]symmetrical tilt grain boundary(GB).Results demonstrate that both P and Mg are segregated at GB,and P has a stronger segregation potency.Mg prefers to substitute at grain boundary plane with the largest absorbable vacancy,whereas P inclines to substitute at the sites near Fe atoms to form strong covalent Fe-P bonds.When Mg exists at GB,the segregation behavior of P may be greatly inhibited by the decrease in possible solution sites and the increase in segregation energy.P has stronger interactions with Mg at GB,forming a lower energy hybridization peak.These results can be used to explain why the addition of a small amount of Mg can ameliorate the temper embrittlement phenomenon. 展开更多
关键词 Α-FE GB P Mg segregation density functional theory
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AIMD study on correlation between chemical effects and segregation behavior in liquid Sb-based alloy
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作者 Zong-bo LI Yan FENG +2 位作者 Ze-hang ZHUANG Xiang PENG Ri-chu WANG 《Transactions of Nonferrous Metals Society of China》 2025年第9期3043-3056,共14页
Elements(As,Bi)and(Cu,Fe)exhibiting two typical segregation behavior in liquid Sb alloys were selected as solute atoms for analysis.Ab initio molecular dynamics(AIMD)simulations were employed to study the molten Sb al... Elements(As,Bi)and(Cu,Fe)exhibiting two typical segregation behavior in liquid Sb alloys were selected as solute atoms for analysis.Ab initio molecular dynamics(AIMD)simulations were employed to study the molten Sb alloy at different temperatures.By analyzing its pair correlation function(PCF),bond pairs,bond angle distribution function(BADF),and Voronoi polyhedron(VP),the short-range order(SRO)of the alloy was investigated.In the Sb melt,the solute atoms Cu and Fe,which have smaller distribution coefficients,exhibit a stronger affinity for Sb than the solute atoms As and Bi,which have larger distribution coefficients.The BADF of As and Bi with larger distribution coefficients shows a lower probability of small-angle peaks compared to large-angle peaks,whereas the BADF of Cu and Fe with smaller distribution coefficients exhibits the opposite trend.The BADF reveals that Sb-As and Sb-Bi approach pure Sb melt,while Sb-Cu and Sb-Fe deviate significantly.Compared to Sb-Cu and Sb-Fe,the Sb-As and Sb-Bi systems exhibit more low-index bonds,suggesting weaker interactions and more disorder.The VP fractions around As and Bi atoms are lower than those around Cu and Fe,and the VP face distributions around As and Bi are more complex.There are differences in the VP around different solute atoms,primarily due to the varying bond pair fractions associated with each solute atom.Fe has the smallest diffusion coefficient,primarily due to its compact local structure. 展开更多
关键词 AIMD segregation liquid Sb-based alloys short-range order AS Bi Cu Fe
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Circle structure and orderly hydrocarbon accumulation of whole petroleum system in a continental rifted basin:A case study of Kong-2 Member in Cangdong Sag,Bohai Bay Basin,China 被引量:1
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作者 ZHAO Xianzheng PU Xiugang +8 位作者 LUO Qun XIA Guochao GUI Shiqi DONG Xiongying SHI Zhannan HAN Wenzhong ZHANG Wei WANG Shichen WEN Fan 《Petroleum Exploration and Development》 2025年第3期587-599,共13页
Guided by the fundamental principles of the whole petroleum system,the control of tectonism,sedimentation,and diagenesis on hydrocarbon accumulation in a rifted basin is studied using the data of petroleum geology and... Guided by the fundamental principles of the whole petroleum system,the control of tectonism,sedimentation,and diagenesis on hydrocarbon accumulation in a rifted basin is studied using the data of petroleum geology and exploration of the second member of the Paleogene Kongdian Formation(Kong-2 Member)in the Cangdong Sag,Bohai Bay Basin,China.It is clarified that the circle structure and circle effects are the marked features of a continental fault petroliferous basin,and they govern the orderly distribution of conventional and unconventional hydrocarbons in the whole petroleum systems of the rifted basin.Tectonic circle zones control sedimentary circle zones,while sedimentary circle zones and diagenetic circle zones control the spatial distribution of favorable reservoirs,thereby determining the orderly distribution of hydrocarbon accumulations in various circles.A model for the integrated,systematic accumulation of conventional and unconventional hydrocarbons under a multi-circle structure of the whole petroleum system of continental rifted basin has been developed.It reveals that each sag of the rifted basin is an independent whole petroleum system and circle system,which encompasses multiple orderly circles of conventional and unconventional hydrocarbons controlled by the same source kitchen.From the outer circle to the middle circle and then to the inner circle,there is an orderly transition from structural and stratigraphic reservoirs,to lithological and structural-lithological reservoirs,and finally to tight oil/gas and shale oil/gas enrichment zones.The significant feature of the whole petroleum system is the orderly control of hydrocarbons by multi-circle stratigraphic coupling,with the integrated,orderly distribution of conventional and unconventional reserves being the inevitable result of the multi-layered interaction within the whole petroleum system.This concept of multi-circle stratigraphic coupling for the orderly,integrated accumulation of conventional and unconventional hydrocarbons has guided significant breakthroughs in the overall,three-dimensional exploration and shale oil exploration in the Cangdong Sag. 展开更多
关键词 circle structure whole petroleum system continental rifted basin Huanghua Depression Bohai Bay Basin Cangdong Sag Paleogene Kong-2 Member orderly hydrocarbon accumulation
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Amplifying Suzuki segregation and hardening in a concentrated solid solution alloy
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作者 Qing Cheng Fusheng Tan +7 位作者 Prajna Paramita Mohapatra Wenquan Ming Jun Ding Qingyang Gao Mingwei Chen Jianghua Chen Xiandong Xu En Ma 《Journal of Materials Science & Technology》 2025年第29期156-169,共14页
Upon ageing of a deformed metal,compositional segregation to dislocations and stacking faults is well known to elevate strength.However,Suzuki segregation effects typically result in a modest strength in-crease on the... Upon ageing of a deformed metal,compositional segregation to dislocations and stacking faults is well known to elevate strength.However,Suzuki segregation effects typically result in a modest strength in-crease on the order of 10 MPa for many substitutional face-centered-cubic solid solutions.Severe pre-deformation can lead to significant hardening but often at the cost of substantial tensile ductility af-ter subsequent aging.Here we propose a novel strategy to improve the Suzuki hardening effect in a single-phase CoCrNi alloy by meticulously controlling repetitive straining and annealing conditions with-out compromising ductility.Our findings revealed that multiple stages of annealing along the way of pre-straining significantly increase the fraction of dislocations that trap partitioning species(i.e.Cr),far exceeding the levels achievable through single-shot annealing after straight pre-deformation to the same accumulative strain(40%).Thermodynamically,the segregation of Cr into stacking faults is driven by re-duced local stacking fault energy(SEF)and system energy.The decreased SFE inhibits dislocation cross-slip,promotes partial dislocation nucleation,and facilitates dislocation intersection,leading to a high den-sity of extended stacking fault ribbons in the multi-pass strained and annealed samples.As a result,the yield strength increments of multi-pass treated samples(75±10 MPa)are four times higher than those of single-pass treated samples(18±8 MPa),while retaining an adequate strain hardening rate,thus pre-serving tensile ductility despite of plastic flow at higher stresses.Our strategy shows promise for broader applications,particularly in scenarios where conventional thermomechanical treatments fail to yield sat-isfactory results. 展开更多
关键词 Suzuki segregation Stacking faults Multi-principal-element alloys Cr segregation Mechanical properties
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Understanding the extrusion microstructures in Mg alloys due to solute segregation
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作者 Dongfang Shi Ziliang Lu +3 位作者 Yunhao Fan Yinghang Liu Xiaoqin Zeng Leyun Wang 《Journal of Magnesium and Alloys》 2025年第6期2670-2679,共10页
Grain boundary segregation(GBS)of solutes influences the grain size,texture,and strength of Mg wrought alloys.So far,solutes'GBS in Mg has mostly been investigated by qualitative experimental observations.In this ... Grain boundary segregation(GBS)of solutes influences the grain size,texture,and strength of Mg wrought alloys.So far,solutes'GBS in Mg has mostly been investigated by qualitative experimental observations.In this work,we develop a quantitative model to compute the grain boundary segregation energy(ΔE_(seg))in binary Mg based alloys that takes the relative atomic density of GB into account.The model is utilized to computeΔE_(seg)of Al,Zn,Ca,Sn,Y,Gd,and Nd solutes in Mg.The result suggests that rare earth elements and Ca are more prone to GBS than Al,Zn,and Sn.Segregation of Gd solutes can explain the smaller grain size and slower grain growth in Mg-Gd extruded alloys than Mg-Al and Mg-Zn counterparts.It also provides an explanation for the weak extrusion texture in Mg-Gd. 展开更多
关键词 Mg alloys solute segregation grain boundary segregation gbs grain boundary segregation qualitative experimental observationsin rare earth elemen relative atomic density quantitative model
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Excellent synergy of formability and strength of a Mg-Zn-Y-Ca-Zr alloy by tailoring segregation-assisted weak elliptical ring texture
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作者 Ming Yang Hai-Long Jia +5 位作者 Run Jiang Xiao-Li Zhou Pin-Kui Ma Zhi-Gang Li Min Zha Hui-Yuan Wang 《Journal of Magnesium and Alloys》 2025年第5期2120-2143,共24页
In this work,a good balance of strength and ductility(a yield strength of 185 MPa and a uniform elongation of 20%)has been obtained in a dilute Mg-1.8Zn-0.3Y-0.3Ca-0.3Zr(wt.%)alloy using hard plate rolling(HPR)followe... In this work,a good balance of strength and ductility(a yield strength of 185 MPa and a uniform elongation of 20%)has been obtained in a dilute Mg-1.8Zn-0.3Y-0.3Ca-0.3Zr(wt.%)alloy using hard plate rolling(HPR)followed by annealing,with a low anisotropy in mechanical properties.More importantly,the HPR-annealed alloy shows an excellent formability at the same time,i.e.,the index Erichsen(I.E.)value reaches 7.9 mm(the Erichsen cupping test)at room temperature,which is higher compared with the Mg-1.8Zn-0.3Y-0.3Ca0.3Zr alloy produced by conventional multi-pass rolling(CR)followed by annealing.The excellent synergy of strength and formability of the HPR-annealed alloy is mainly attributed to a weak elliptical ring texture,as well as finer and denser Zn_(2)Zr_(3)precipitates.The formation of weak elliptical ring texture is related to the preferential co-segregation of Zn and Ca elements at boundaries of basal grains with smal misorientation angles during annealing,which inhibits the growth of basal grains and promotes the preferential growth of non-basal grains At the same time,in comparison with the CR-annealed alloy,the HPR-annealed alloy contains finer and denser Zn_(2)Zr_(3)precipitates that ar less likely to become sources of cracks,leading to the higher strength and formability of the HPR-annealed alloy.The results in this work can provide reference for the development of high strength Mg alloy sheets with excellent room temperature formability,which also shed light on mitigating planar anisotropy in mechanical properties for Mg alloy sheets. 展开更多
关键词 Magnesium alloy TEXTURE FORMABILITY segregation PRECIPITATE
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Publisher Correction:Controlling segregation and hardenability of gear steel based on as-cast structure
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作者 Hai-jie Wang Ze Zhang +4 位作者 Peng Lan Gang Chen Pu Wang Chuan-hui Jiang Jia-quan Zhang 《Journal of Iron and Steel Research International》 2025年第12期4529-4529,共1页
Correction to:J.Iron Steel Res.Int.(2025)32:144-158 https://doi.org/10.1007/s42243-024-01416-x The publication of this article unfortunately contained mistakes.Only one corresponding author was named instead of three.... Correction to:J.Iron Steel Res.Int.(2025)32:144-158 https://doi.org/10.1007/s42243-024-01416-x The publication of this article unfortunately contained mistakes.Only one corresponding author was named instead of three.The corrected corresponding authors are given below. 展开更多
关键词 gear steel HARDENABILITY cast structure segregation
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