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High Strength and Ductility of a MgAg/MgGdYAg/MgAg Sandwiched Plate Produced by High-Pressure Torsion

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 343-351页

作者： Qile Huo Yaxin chen Bo Gao Yi Liu Manping Liu xuefei chen Hao Zhou School of Materials Science and Engineering Jiangsu UniversityZhenjiang212013China State Grid Yangzhou Power Supply Company Yangzhou225000China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China

Due to their unique precipitation behavior,magnesium-rare earth(Mg-RE)alloys exhibit excellent strength and high thermal ***,owing to the negative blocking effect of precipitation on dislocation slipping,the plasticity and ductility of Mg-RE alloys become deteriorate after aging *** this work,a novel strategy to improve the combination of strength and ductility by designing a laminate heterostructured Mg alloy is ***-pressure torsion(HPT)processing is employed to fabricate a clean and well-bonded interface between MgGdYAg and MgAg *** two alloys have huge differences in precipitation hardening,and ductility is improved due to two *** one thing,the density of the second phases in the MgAg alloy is much lower than that of MgGdYAg alloy;for another,the non-basal〈c+a〉slipping is continuously activated during *** this mechanism,the uniform elongation of the heterostructured MgAg/MgGdYAg/MgAg alloy is improved to 7.1%.

关键词： Heterogeneous Mechanical properties Mg-RE alloys Laminate

Unexpected high-temperature brittleness of a Mg-Gd-Y-Ag alloy

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Journal of Magnesium and Alloys 2022年第9期10卷 2510-2515页

作者： Lirong Xiao xuefei chen Huiyan Ning Ping Jiang Yi Liu Bin chen Dongdi Yin Hao Zhou Yuntian Zhu Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanical and Electrical Engineering Heilongjiang Institute of TechnologyHarbin 150050China ThermoFisher Scientific Shanghai 201210China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuan 610031China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

Rare earth(RE)can produce excellent precipitation hardening in Mg ***,when forming a solid solution,it also deteriorates formability,a problem that can usually be overcome by raising deformation *** we report an unexpected observation of high temperature brittleness in a Mg-Gd-Y-Ag *** the temperature reached 500℃,the formability decreased drastically,leading to severe intergranular fracture under only 0.5% *** was caused by failure of grain boundaries,which are weakened by segregated interfacial compounds.

关键词： Interfacial compounds Formability High temperature brittleness Grain boundary sliding

Optimizing Spatial Relationships in GCN to Improve the Classification Accuracy of Remote Sensing Images

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Intelligent Automation & Soft Computing 2023年第7期37卷 491-506页

作者： Zimeng Yang Qiulan Wu Feng Zhang xuefei chen Weiqiang Wang XueShen Zhang School of Information Science&Engineering Shandong Agricultural UniversityTaian271018China

Semantic segmentation of remote sensing images is one of the core tasks of remote sensing image *** the continuous develop-ment of artificial intelligence technology,the use of deep learning methods for interpreting remote-sensing images has *** neural networks disregard the spatial relationship between two targets in remote sensing *** segmentation models that combine convolutional neural networks(CNNs)and graph convolutional neural networks(GCNs)cause a lack of feature boundaries,which leads to the unsatisfactory segmentation of various target feature *** this paper,we propose a new semantic segmentation model for remote sensing images(called DGCN hereinafter),which combines deep semantic segmentation networks(DSSN)and *** the GCN module,a loss function for boundary information is employed to optimize the learning of spatial relationship features between the target features and their relationships.A hierarchical fusion method is utilized for feature fusion and classification to optimize the spatial relationship informa-tion in the original feature *** experiments on ISPRS 2D and DeepGlobe semantic segmentation datasets show that compared with the existing semantic segmentation models of remote sensing images,the DGCN significantly optimizes the segmentation effect of feature boundaries,effectively reduces the noise in the segmentation results and improves the segmentation accuracy,which demonstrates the advancements of our model.

关键词： Remote sensing image semantic segmentation GCN spatial relationship feature fusion

Mechanical property comparisons between CrCoNi medium-entropy alloy and 316 stainless steels

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Journal of Materials Science & Technology 2022年第13期108卷 256-269页

作者： Xiaoru Liu Hao Feng Jing Wang xuefei chen Ping Jiang Fuping Yuan Huabing Li En Ma Xiaolei Wu State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China School of Metallurgy Northeastern UniversityShenyang 110819China Center for Alloy Innovation and Design(CAID) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi’an 710049China

We systematically compared the mechanical properties of CrCoNi,a recently emerged prototypical medium-entropy alloy(MEA)with face-centered-cubic(FCC)structure,with hallmark FCC alloys,in particular,the well-known austenitic 316 L and 316 LN stainless steels,which are also concentrated singlephase FCC solid solutions and arguably next-of-kin to the *** tensile and impact properties,across the temperatures range from 373 K to 4.2 K,as well as fracture toughness at 298 K and 77 K,were *** room temperature to cryogenic temperature,all three alloys exhibited similarly good mechanical properties;CrCoNi increased its tensile uniform elongation and fracture toughness,which was different from the decreasing trend of the 316 L and 316 *** the other hand,the stainless steels showed higher fracture toughness than CrCoNi at all *** explain the differences in macroscopic mechanical properties of the three alloys,microstructural hardening mechanisms were *** MEA relied on abundant mechanical twinning on the nanoscale,while martensitic transformation was dominant in 316 L at low *** deformation mechanisms in the plastic zone ahead of the propagating crack in impact and fracture toughness tests were also analyzed and compared for the three alloys.

关键词： Medium-entropy alloy Austenite stainless steel Strain hardening Ductility Fracture toughness Charpy impact toughness

Effects of Steam Curing on the Resistance of Cementitious Materials to Chloride Penetration

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 885-891页

作者： chen xuefei HE Yongjia Lü Linnü ZHANG Xulong HU Shuguang State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China Hubei Provincial Academy of Building Research and Design Co. LtdWuhan430071China

The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,LF-NMR and rapid chloride migration *** results show that the curing regime has influences on the types and structure of the hydration products,which in turn affects their ability to bind chloride *** binding capacity of cementitious materials to chloride ions,porosity and chloride ion migration coefficient increased with the increase of water-cement ratio,while steam curing increased the porosity and chloride ion migration coefficient at the same time as it increased the chloride ion binding capacity of the *** lower water-cement ratios,the effect of steam curing on the resistance of cementitious materials to chloride ingress is negligible.

关键词： chloride penetration chloride binding capacity pore structure steam curing cementitious materials

Strengthening and ductilization of laminate dual-phase steels with high martensite content

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Journal of Materials Science & Technology 2021年第6期65卷 29-37页

作者： Bo Gao Rong Hu Zhiyi Pan xuefei chen Yi Liu Lirong Xiao Yang Cao Yusheng Li Qingquan Lai Hao Zhou Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

The steels with excellent strength and ductility are expected to be achieved by tailoring the microstructural *** this work,laminate dual-phase(DP)steels with high martensite content(laminate HMDP steels)were produced by a combination of warm rolling and intercritical *** of rolling strain and annealing temperature on the microstructural evolution and mechanical properties of laminate HMDP steels were systematically *** strength of HMDP steels was significantly improved to~1.6 GPa associated with a high uniform elongation of 7%,as long as the laminate structure is *** strengthening and ductilizing mechanisms of laminate HMDP steels are discussed based on the influence of laminate structure and the high martensite content,which promote the development of internal stresses and can be correlated to the Bauschinger effect as measured by the cyclic loadingunloading-reloading *** transmission electron microscopy(TEM)observation was applied to characterize the dislocation structure in the deformed ferrite.

关键词： Dual phase steel Warm rolling Laminate structure Bauschinger effect HDI stress

Formation mechanism of co-axial grain boundaries in a Mg alloy

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Journal of Magnesium and Alloys 2023年第3期11卷 1094-1101页

作者： Zhen Peng Yi Liu Lirong Xiao Yue Yang Bo Gao Mengning Xu Zhaohua Hu Yandong Yu xuefei chen Hao Zhou School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Association for Science and Technology Nanjing University of Science and TechnologyNanjing 210094China Ansteel Beijing Research Institute Co. Ltd.Beijing 102209China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China

Due to the insufficient slip systems in hexagonal close-packed structure,twinning is frequently activated to support stable plastic deformation of Mg *** this work,we found four typical twin-like interfaces with misorientations of 102°,109°,142°and 149°,respectively,which had not only a shared[1120]zone axis of neighboring grains,but also overlapped diffraction spots similar to ***,highresolution transmission electron microscope(HRTEM)analysis revealed that the interfaces in real space deviated from the supposed twinning planes in reciprocal space,*** overlapped diffraction *** clarified that the incoherent interfaces were co-axial grain boundaries(CGBs).Additionally,a special angle ofθ,close to 90°,between the interface and one side of basal plane,was frequently formed in *** proposed that interaction of multiple twinning contributes to the formation of CGBs,and theθis formed due to alternative tensile and compression twinning under a uniaxial loading.

关键词： Interface Twinning Tilt boundaries TEM Formation mechanism

Contamination Identification of Lentinula Edodes Logs Based on Improved YOLOv5s

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Intelligent Automation & Soft Computing 2023年第9期37卷 3143-3157页

作者： xuefei chen Wenhui Tan Qiulan Wu Feng Zhang Xiumei Guo Zixin Zhu School of Information Science&Engineering Shandong Agricultural UniversityTai’an271018China Department of Regulations Tai’an Service Center for Urban Comprehensive ManagementTai’an271018China

In order to improve the accuracy and efficiency of Lentinula edodes logs contamination identification,an improved YOLOv5s contamination identification model for Lentinula edodes logs(YOLOv5s-CGGS)is proposed in this ***,a CA(coordinate attention)mechanism is introduced in the feature extraction network of YOLOv5s to improve the identifiability of Lentinula edodes logs contamination and the accuracy of target ***,the CIoU(Complete-IOU)loss function is replaced by an SIoU(SCYLLA-IoU)loss function to improve the model’s convergence speed and inference ***,the GSConv and GhostConv modules are used to improve and optimize the feature fusion network to improve identification *** method in this paper achieves values of 97.83%,97.20%,and 98.20%in precision,recall,and mAP@0.5,which are 2.33%,3.0%,and 1.5%better than YOLOv5s,***@0.5 is better than YOLOv4,Ghost-YOLOv4,and Mobilenetv3-YOLOv4(improved by 4.61%,5.16%,and 6.04%,respectively),and the FPS increased by two to three times.

关键词： Lentinula edodes logs contamination identification deep learning attention mechanism loss function

The Binarity of Early-type Stars from LAMOST medium-resolution Spectroscopic Survey

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Research in Astronomy and Astrophysics 2022年第2期22卷 92-107页

作者： Yanjun Guo Jiao Li Jianping Xiong Jiangdan Li Luqian Wang Heran Xiong Feng Luo Yonghui Hou Chao Liu Zhanwen Han xuefei chen Yunnan Observatories Chinese Academy of SciencesP.O.Box 110Kunming650011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing100049China Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Research School of Astronomy and Astrophysics Mount Stromlo ObservatoryThe Australian National UniversityACT 2611Australia Nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China School of Astronomy and Space Science University of Chinese Academy of SciencesChina Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100012China

Massive binaries play significant roles in many *** massive stars,particularly massive binaries,is of great *** this paper,by adopting the technique of measuring the equivalent widths of several spectral lines,we identified 9382 early-type stars from the LAMOST medium-resolution survey and divided the sample into four groups,T1(~O-B4),T2(~B5),T3(~B7)and T4(~B8-A).The relative radial velocities RVrelwere calculated using Maximum Likelihood *** stars with significant changes of RVreland at least larger than 15.57 km s-1 were identified as spectroscopic *** found that the observed spectroscopic binary fractions for the four groups are 24.6%±0.5%,20.8%±0.6%,13.7%±0.3%and 7.4%±0.3%,*** that orbital period(P)and mass ratio(q)have intrinsic distributions as f(P)∝Pπ(1

关键词： early-type stars:statistics (stars:)binaries:spectroscopic catalogs