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The microstructure characteristics and fracture behavior of the polyhedral primary iron-rich phase and plate-shaped eutectic iron-rich phase in a high-pressure die-cast AlSi10mnmg alloy

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Journal of materials Science & Technology 2023年第9期140卷 201-209页

作者： X.y.Jiao y.X.liu J.Wang W.N.liu A.X.Wan Stuart Wiesner S.m.Xiong School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Lightweight Structural materials Liaoning ProvinceNortheastern UniversityShenyang 110819China Key Laboratory for Advanced materials Processing Technology Tsinghua UniversityBeijing 100084China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Ein Unternehmen der ALUmINIUm RHEINFELDEN Group RHEINFELDEN 79618Germany

The characterization of multiple iron-rich phases in high-pressure die-cast AlSi10mnmg alloy was *** was focused on the formation and fracture behavior of the primary iron-rich phase((P-ImC)_(I))formed in the shot sleeve and plate-shaped eutectic iron-rich phase in high-pressure die cast(HPDC)AlSi10mnmg *** show that multiple types of iron-rich phases with various morphologies,in-cluding primary iron-rich phases(polyhedral(P-ImC)_(I) and(P-ImC)_(II))and eutectic iron-rich phases(plate-shaped,net shape,and fish-bone shape),were found in HPDC ***(P-ImC)_(I) formed in the shot sleeve were distributed in the interface between primaryα-Al and binary Al-Si *** size(P-ImC)_(II) and various eutectic iron-rich phases formed in the die cavity and they were distributed in Al-Si binary *** primary iron-rich phases belonged to a simple cubic crystal structure with a lattice constant a=1.265 nm and they exhibited a lateral growth characteristic with a termination of{110}surface.βphase was surrounded byδphase and they coexisted in a plate-shaped iron-rich ***-density stacking fault inβphase andδ/βinterface provided an excellent nucleation site forδ*** mechanical behavior,the stress concentration caused by eutectic iron-rich phases was far less than(P-ImC)_(I) and it would not cause crack initiation along the eutectic cluster *** addition,(P-ImC)_(I) showed the worst deformation coordination with primaryα-Al while the plate-shaped eutectic iron-rich phase exhibited similar deformation characteristics with silicon particles.

关键词： AlSi10mnmg High-pressure die casting multiple iron-rich phases

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EFFECT OF NANOCRySTALLINE AND TWIN BOUNDARIES ON CORROSION BEHAVIOR OF 316L STAINLESS STEEL USING SmAT

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Acta metallurgica Sinica(English Letters) 2006年第3期19卷 183-189页

作者： A.Q. Lü y. Zhang y. Li G. liu Q.H. Zang C.m. liu School of materials and metallurgy Northeastern University Shenyang 110004 China Jiuquan Iron ＆ Steel （Group） Go. Ltd Jiayuguan 735100 China State Key Laboratory for Corrosion and Protection of metals Institute of Metal Research The Chinese Academy of Sciences Shenyang 110015 China Shenyang National Laboratory for materials Science Institute of Metal Research The Chinese Academy of Science Shenyang 110016 China

By means of surface mechanical attrition treatment （ SmAT）, the groin size with a diameter of aboat 60hm formed at about 20μm depth and numerous mechanical twins at about 50μm depth from the treated surface were synthesized in 316L stainless steel because of the different distributions of strain and strain rate along depth orientation. For instance the maximum strain rate reached 10^3-10^4s^-1 on the top surface. The relationship between the microsturcture and the corrosion property was studied in 0.05m H2SO4＋ 0.25m Na2SO4 aqueous solution, and the results show an extreme improvement of corrosion resistance owing to the appearance of twin boundaries and the obvious reduction in corrosion resistance attributed to the presence of nanocrystaline boundaries.

关键词： surface mechanical attrition treatment 316L stainless steel corrosion property twin boundary nanocrystaline boundary

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INTERACTIONS BETWEEN La_(2)O_(3) PARTICLES AND DISLOCATIONS IN mo-La_(2)O_(3) ALLOyS

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Acta metallurgica Sinica(English Letters) 2005年第6期18卷 714-718页

作者： J.X. Zhang D.m. liu y. Q. liu m.L. Zhou T. y. Zuo The Key Laboratory of Advanced Functional materials Ministry of EducationBeijing University of Technology Beijing 100022 China

The mechanical properties of molybdenum wires doped with different contents of La2O3 were investigated systematicaUy and the interaction between La2O3 particles with dislocations in mo- La2O3 wires were observed by SEm and TEm. It is shown that mo-La2O3 wires possess much higher tensile strength than the pure mo. In wires the dislocation motion is strongly hindered by La2O3 particles, which remains up to much higher temperature. moreover, a number of prismatic dislocation loops and hexagonal dislocation network have been formed in annealed mo-La2O3 wires. The higher strength of mo-LazOs than the pure mo is attributed to the La2O3 particles dispersion strengthening and dislocation strengthening.

关键词： molybdenum La2O3 dislocation strengthening

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Interest of D-dimer level,severity of COVID-19 and cost of management in Gabon

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World Journal of Critical Care medicine 2025年第1期14卷 91-99页

作者： Berthe A Iroungou Arnaud Nze O Helga m Kandet y Neil-michel Longo-Pendy Nina D mezogho-Obame Annicet-Clotaire Dikoumba Guignali L mangouka Unitémixte de Recherche Centre International de Recherches Médicales de Franceville et le Service de SantéMilitaireLibreville 20404EstuaireGabon AP-HP Health Economics Research UnitHtel Dieu HospitalParis 75004Ilede-FranceFrance Laboratory Hôpital D'Instruction des Armées D'AkandaLibreville 20404EstuaireGabo Unitéde Recherche enÉcologie de la Santé Centre Interdisciplinaire de Recherches Médicales de FrancevilleFranceville 769Gabon Laboratory Hôpital D'Instruction des Armées Omar Bongo OndimbaLibreville 20404EstuaireGabon Department of medecine Polyvalente Hôpital D'Instruction des Armées Omar Bongo OndimbaLibreville 20404EstuaireGabon

BACKGROUND Coronavirus disease 2019(COVID-19)is strongly associated with an increased risk of thrombotic events,including severe outcomes such as pulmonary *** D-dimer levels are a critical biomarker for assessing this *** Gabon,early implementation of anticoagulation therapy and D-dimer testing has been crucial in managing *** study hypothesizes that elevated Ddimer levels are linked to increased COVID-19 *** To determine the impact of D-dimer levels on COVID-19 severity and their role in guiding clinical *** This retrospective study analyzed COVID-19 patients admitted to two hospitals in Gabon between march 2020 and December *** study included patients with confirmed COVID-19 diagnoses and available D-dimer measurements at *** on demographics,clinical outcomes,D-dimer levels,and healthcare costs were ***-19 severity was classified as non-severe(outpatients)or severe(inpatients).A multivariable logistic regression model was used to assess the relationship between D-dimer levels and disease severity,with adjusted odds ratios(OR)and 95%*** A total of 3004 patients were included,with a mean age of 50.17 years,and the majority were female(53.43%).Elevated D-dimer levels were found in 65.81%of patients,and 57.21%of these experienced severe *** analysis showed that patients with elevated D-dimer levels had 3.33 times higher odds of severe COVID-19(OR=3.33,95%CI:2.84-3.92,Pmained significant in the multivariable analysis,adjusted for age,sex,and year of *** financial analysis revealed a substantial burden,particularly for uninsured *** D-dimer predicts COVID-19 severity and guides treatment,but the high cost of anticoagulant therapy highlights the need for policies ensuring affordable access in resource-limited settings like Gabon.

关键词： D-dimers COVID-19 management Disease severity Healthcare costs Gabon

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Reactive destabilization and bidirectional catalyzation for reversible hydrogen storage of LiBH_(4) by novel waxberry-like nano-additive assembled from ultrafine Fe_(3)O_(4) particles

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Journal of materials Science & Technology 2024年第6期173卷 63-71页

作者： S.Wang m.H.Wu y.y.Zhu Z.L.Li y.X.yang y.Z.Li H.F.liu m.X.Gao Department of material Science Shenzhen MSU-BIT UniversityShenzhen 518172China State Key Laboratory of Silicon and Advanced Semiconductor materials&School of materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Resources Utilization and Rare Earth Development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021China National Supercomputing Center in Shenzhen Shenzhen 518055China

LiBH_(4) containing 18.5 wt.%H_(2) is an attractive high-capacity hydrogen storage material,however,it suffers from high operation temperature and poor ***,a novel and low-cost bifunctional additive,waxberry-like Fe_(3)O_(4) secondary nanospheres assembled from ultrafine primary Fe_(3)O_(4) nanoparticles,is synthesized,which exhibits significant destabilization and bidirectional catalyzation towards(de)hydrogenation of LiBH_(4).With an optimized addition of 30 wt.% waxberry-like Fe_(3)O_(4),the system initiated dehydrogenation below 100℃ and released a total of 8.1 wt.%H_(2) to 400℃.After 10 cycles,a capacity retention of 70% was achieved,greatly superior to previously reported oxides-modified *** destabilizing and catalyzing mechanisms of waxberry-like Fe_(3)O_(4) on LiBH_(4) were systematically analyzed by phase and microstructural evolutions during dehydrogenation and hydrogenation cycling as well as density functional theory(DFT)*** present work provides new insights in developing advanced nano-additives with unique structural and multifunctional designs towards LiBH4 hydrogen storage.

关键词： LiBH_(4) Hydrogen storage Waxberry-like Fe_(3)O_(4) Destabilization Catalysis

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EFFECT OF LASER INPUT ENERGy ON AuSn_x INTERmETALLIC COmPOUNDS FORmATION IN SOLDER JOINTS WITH DIFFER-ENT THICKNESS OF Au SURFACE FINISH ON PADS

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Acta metallurgica Sinica(English Letters) 2008年第3期21卷 183-190页

作者： W. liu C.Q. Wang y.H. Tian m.y. Li Department of Electronics Packaging Technology State Key Lab of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China Shenzhen Graduate School of Harbin Institute of Technology Shenzhen 518055 China

Formation of AuSnx intermetallic compounds （ImCs） in laser reflowed solder joints was investigated. The results showed that few ImCs formed at the solder/0. 1μm Au interface. Needlelike AuSn4 ImCs were observed at the solder/0.5μm Au interface. In Sn-2.0Ag-O,75Cu-3,0Bi and Sn-3.5Ag-O.75Cu solder joints, when the laser input energy was increased, AuSn4 ImCs changed .from a layer to needlelike or dendritic distribution at the solder/0.9μm Au interface. As for the solder joints with 4.0 μm thickness of Au surface finish on pads, AuSn4 , AuSnx, AuSn ImCs, and Au2Sn phases formed at the interface. moreover, the content of AuSnx ImCs, such as, AuSn4 and AuSn2, which contained high Sn concentration, would become larger as the laser input energy increased. In the Sn-37Pb solder joints with 0.9 μm or 4.0 μm thickness of the Au surface finish on pads, AuSn4 ImCs were in netlike distribution. The interspaces between them were filled with Pb-rich phases.

关键词： Laser soldering Inlermetallics Au films

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Point process microstructural model of metallic thin films with implications for coarsening

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npj Computational materials 2023年第1期9卷 2074-2082页

作者： J.m.Rickman K.Barmak y.Epshteyn C.liu Department of materials Science and Engineering Lehigh UniversityBethlehemPA 18015USA Department of Physics Lehigh UniversityBethlehemPA 18015USA Department of Applied Physics and Applied mathematics Columbia UniversityNew YorkNY 10027USA Department of mathematics The University of UtahSalt Lake CityUT 84112USA Department of Applied mathematics Illinois Institute of TechnologyChicagoIL 60616USA

We develop a thin-film microstructural model that represents structural markers(i.e.,triple junctions in the two-dimensional projections of the structure of films with columnar grains)in terms of a stochastic,marked point process and the microstructure itself in terms of a grain-boundary *** advantage of this representation is that it is conveniently applicable to the characterization of microstructures obtained from crystal orientation mapping,leading to a picture of an ensemble of interacting triple junctions,while providing results that inform grain-growth models with experimental *** specifically,calculated quantities such as pair,partial pair and mark correlation functions,along with the microstructural mutual information(entropy),highlight effective triple junction interactions that dictate microstructural *** validate this approach,we characterize microstructures from Al thin films via crystal orientation mapping and formulate an approach,akin to classical density functional theory,to describe grain growth that embodies triple-junction interactions.

关键词： grain microstructure process

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Dislocation ordering and texture strengthening of naturally aged Al-Cu-mg alloy

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Journal of materials Science & Technology 2022年第23期118卷 1-14页

作者： F.liu Z.y.liu G.y.He L.N.Ou School of materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous metal materials Science and Engineering Ministry of EducationCentral South UniversityChangsha 410083China National Key Laboratory of Science and Technology on High-Strength Structural materials Central South UniversityChangsha 410083China

Stability of grain structure,dislocation ordering and strengthening mechanisms of the naturally aged AlCu-mg alloy after solution treatment are investigated by using optical microscope(Om),scanning electron microscope(SEm),electron back-scattered diffraction(EBSD),X-ray diffraction(XRD) and transmission electron microscope(TEm).Results show that {100},{100},{110} and {110}slip systems can be activated after solution treatment,which can promote the formation of {110}Goss *** combination effect of T-Al_(20)Cu_(2) mn_(3) phase and Goss-oriented grains with large Taylor factor makes the solution-treated alloys display excellent stability of grain *** enhanced yield strength of the alloy is ascribed to grain-refine strengthening,dispersed particles strengthening,dislocation strengthening and texture *** coarsening of the second phase is responsible for softening of the alloy after annealing at 400 ℃+solution treatment at 475 ℃.

关键词： Al-Cu-mg alloy Dislocation ordering Goss texture Grain structure stability Texture strengthening

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Sora文生视频大模型对学术期刊出版的机遇、挑战及应对

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新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 79-88页

作者：刘娟新疆师范大学期刊社新疆乌鲁木齐830017

随着Sora文生视频大模型的迅猛发展,学术期刊出版正在经历深刻的变革与重塑。Sora技术的多模态特征与智能化能力,一方面促进学术信息的动态整合与开放获取,推动传统出版模式向协同创新与知识共享的新范式转型;另一方面,赋予著作权归属... 详细信息

随着Sora文生视频大模型的迅猛发展,学术期刊出版正在经历深刻的变革与重塑。Sora技术的多模态特征与智能化能力,一方面促进学术信息的动态整合与开放获取,推动传统出版模式向协同创新与知识共享的新范式转型;另一方面,赋予著作权归属和著作权风险治理等新的价值意蕴。面对Sora文生视频大模型对学术期刊出版带来的机遇和挑战,学术期刊应构建跨学科协作网络、重塑基于价值的学术评价标准、创新人才培养机制,强化全球学术出版治理。文本通过系统分析大语言模型、文生视频大模型驱动下的新兴学术生态,旨在为学术界提供理论视角和实践样态,实现知识生产的原创性与伦理性,推动学术出版在新技术环境中的学术治理现代化及可持续高质量发展。

关键词： Sora 学术期刊出版技术伦理学术伦理学术生态系统

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Study of Physicochemical Properties and Active Oxygen in Structures ofLayered mixed La_(4)BaCu_(5-x)mxO_(13+λ)(m=mn,Co)

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Journal of Rare Earths 1999年第2期17卷 52-56页

作者： liu, y yang, XG Wu, y Chinese Acad Sci Changchun Inst Appl Chem Changchun 130022 Peoples R China

Two series of layered mixed oxides La4BaCu5-xmxO13+(m=mn, Co, x=05) were prepared and characterized by means of XRD, XPS, O2TPD and chemical analysis. The results show that their structures are 5layered ABO3 perovskite, and the XPS and O2TPD investigation confirms that there exists synergistic effect between Cu ion and m when m ion is doped into the lattice of La4BaCu5O13+, and the synergistic effect between mn and Cu is stronger than that of CuCo.

关键词： Rare earths Layered mixed oxides Synergistic effect Active oxygen species

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