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Role of grain boundary character on Bi segregation-induced embrittlement in ultrahigh-purity copper

Journal of Materials Science & technology 2023年第28期159卷 52-61页

作者： Y.X.Hua K.X.Song H.t.liu J.W.Wang C.M.Zhang Y.J.Zhou B.Pang J.t.Song J.L.He H.L.Zhao School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Academy of Sciences Zhengzhou 450000China Henan Key Laboratory of Advanced Conductor Materials Zhengzhou 450046China Provincial and Ministerial Co-construction of Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing technology Luoyang 471023China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Bismuth(Bi),as an impurity element in copper and copper-based alloys,usually has a strong tendency of grain boundary(GB)segregation,which depends on the GB ***,the influence of such a segregation on the properties of ultrahigh-purity copper has been rarely reported and the exact structural arrangements of Bi atoms at different GBs remain largely *** this study,we investigated the influ-ence of trace amounts of Bi(50-300 wt ppm)on the ductility of an ultrahigh-purity copper(99.99999%)in the range of room temperature to 900°*** tensile results show that the addition of Bi seriously damages the ductility of the ultrahigh-purity copper at temperatures of 450-900°C,which is due to the GB segregation of *** this basis,such a segregation behavior at different types of GBs,including high and low angle GBs(HAGBs/LAGBs),and twin boundaries(tBs),via the scanning electron microscope-electron backscattered diffraction(SEM-EBSD)and aberration-corrected scanning transmission electron microscope(AC-StEM)investigations,combined with the first-principles calculations were systematically *** atomistic characterizations demonstrate an anisotropic Bi segregation,where severe enrich-ment of Bi atoms typically occurs at the HAGBs,while the absence of Bi adsorption prevails at LAGBs or *** particular,the segregated Bi at random HAGBs exhibited the directional bilayer adsorption,while the special symmetrical7 HAGB presented a unique Bi-rich cluster *** findings pro-vide a comprehensive experimental and computational understanding on the atomic-scale segregation of impurities in metallic materials.

关键词： Grain boundary character Embrittlement Bi segregation Atomic configuration Ultrahigh-purity copper

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tailoring nanoprecipitates for ultra-strong high-entropy alloys via machine learning and prestrain aging

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Journal of Materials Science & technology 2021年第10期69卷 156-167页

作者： tao Zheng Xiaobing Hu Feng He Qjngfeng Wu Bin Han Chen Da Junjie Li Zhijun Wang Jincheng Wang Ji-jung Kai Zhenhai Xia C.t.liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Institute of Atomic and Molecular Science.Shaanxi University of Science and technology Xi'an710021China Department of Material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina Department of Materials Science and Engineering University of North TexasDentonTXUSA Center for Advanced Structural Materials Department of Mechanical EngineeringCollege of Science and EngineeringCity University of Hong KongHong KongChina

the multi-principal-component concept of high-entropy alloys(HEAs) generates numerous new *** them,nanoscale precipitated HEAs have achieved superior mechanical properties and shown the potentials for structural ***,it is still a great challe nge to find the optimal alloy within the numerous *** to now,the reported nanoprecipitated HEAs are mainly designed by a trialand-error approach with the aid of phase diagram calculations,limiting the development of structural *** the current work,a novel method is proposed to accelerate the development of ultra-strong nanoprecipitated *** the guidance of physical metallurgy,the volume fraction of the required nanoprecipitates is designed from a machine learning of big data with thermodynamic foundation while the morphology of precipitates is kinetically tailored by prestrain *** a proof-of-principle study,an HEA with superior strength and ductility has been designed and systematically *** newly developed γ’-strengthened HEA exhibits 1.31 GPa yield strength,1.65 GPa ultimate tensile strength,and 15% tensile *** probe tomography and transmission electron microscope characterizations reveal the well-controlled high γ’ volume fraction(52%) and refined precipitate size(19 nm).the refinement of nanoprecipitates originates from the accelerated nucleation of the γ’ phase by prestrain aging.A deeper understanding of the excellent mechanical properties is illustrated from the aspect of strengthening mecha ***,the versatility of the current design strategy to other precipitation-hardened alloys is discussed.

关键词： High-entropy alloys Machine learning Prestrain aging Mechanical properties Strengthening mechanisms

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Short Notes ON tHE γ—ε tRANSFORMAtION BELOW tHE NEEL tEMPERAtURE IN Fe—Mn—Si ALLOYS

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同步辐射装置用户科技论文集 1999年第1期 26-29页

作者： t.liu Z.t.ZHAO 等 BeijingSynchrotronRadiationFacility InstituteofHighEnergyPhysicsChineseAcademyofSciencesBeijing100039P.R.China DepartmentofMaterialsPhysics UniversityofScience＆TechnologyBeijing

there are two tpyes of phase transformations in Fe-Mn and Fe-Mn-Si alloys when the temperature is decreased,γ(fcc)→ε(hcp) martensitic transformation(Mt) and paramagnetic-antiferromagnetic transition (AMt) of γ *** the thermodynamic point of view,the former usually appears in a slightly higher temperature range than the latter because if is generally accepted that the magnetic tansition has a suppressing effect on the thermally induced ε martensite(Sato et al.,1984.,Bogachev and Zvigintzeva,1976;Murakami et al.,1987:Yang et al.,1992) Gartstein and Robinkin(1979) even thought that the γ-ε transformation should be terminated below Neel temperature(tN) due to the decrease of free energy arising from the AMt of γ ***,some experimental results hae indicated the formation of ε phase below t(Li and Wayman,1994:Fujimori.1966).In the present *** behavor of γ-ε transformation below tN was furtherinvestigated by clectrical resistance measurements.

关键词：相变 Fe-Mn-Si合金 γ(fcc)-ε(hcp)

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Autopilot Design for a Side-Jet Missile based on MRVSS with an Adaptive Approach Law

Autopilot Design for a Side-Jet Missile based on MRVSS with ...

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第二十九届中国控制会议

作者： Hugh H.t.liu University of toronto Institute for Aerospace Studies

the autopilot design of a side jet and aero-fin blending control air-to-air missile is discussed in this paper and a Model Reference Variable Sliding Structure（MRVSS）method is *** side jets are in the discontinuous on-off pulse forms which are different from the conventional continuous side *** control parameters are sought though Genetic Algorithm（GA）.Further,a novel adaptive variable-rate exponential approach law is introduced to approach the sliding surface *** proposed method is verified by simulations on a research side-jet missile model and it’s convenient to be carried out on other multi-actuator applications which is meaningful in actual engineering.

关键词： Side Jet Model Reference Variable Sliding Structure Adaptive Approach Law

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the Functional Significance of Education In Dementia

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上海精神医学 1992年第S1期 59-64页

作者： William t. liu Elena Yu MPH

this paper uses the sociological perspective to address the issue of the meaning in the observed association between education and dementia which we found in Shanghai. If a reduction in syuaptic reserve is the biologically plausible explanation for the development of dementia and AD, then it must have a social behavioral dimension for us to be able to assess the changes in the brain through neuropsychological tests and clinical evaluations, in the absence of autopsies. What are the socially plausible hypotheses which would be consistent with the biologically plausible explanation concerning synapse loss (or reduction in brain reserve) and dementia or AD? Sociological concepts are introduced to answer this question.

关键词： the Functional Significance of Education In Dementia

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硼对有序态Ni_3Fe合金氢气环境中氢脆敏感性的影响

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南京大学学报（自然科学版） 2009年第2期45卷 241-247页

作者：马杰陈业新 liu C t 上海大学材料研究所上海 200072 田纳西大学材料科学与工程系美国TN37996-2200

硼含量(0.01～0.06wt.%B)对有序态Ni-24at.%Fe合金在真空和氢气环境中的力学性能有较大的影响,对有序态Ni3Fe合金在氢气环境中的氢脆敏感性也有较大的作用.研究结果表明,加硼后有序Ni3Fe合金的晶粒尺寸得到细化,材料的强韧性提高;硼有... 详细信息

硼含量(0.01～0.06wt.%B)对有序态Ni-24at.%Fe合金在真空和氢气环境中的力学性能有较大的影响,对有序态Ni3Fe合金在氢气环境中的氢脆敏感性也有较大的作用.研究结果表明,加硼后有序Ni3Fe合金的晶粒尺寸得到细化,材料的强韧性提高;硼有效抑制了有序态Ni-24at.%Fe合金在氢气环境中的氢脆.当合金中硼含量为0.06wt.%时,有序态Ni3Fe合金在氢气环境中的氢脆因子(IH2)为1%,与无硼Ni3Fe合金相比,合金氢脆因子的下降幅度达到98.7%.在氢气环境中拉伸时,无硼有序态Ni3Fe合金的断口形貌为完全的沿晶断口;随着Ni3Fe合金中硼含量的增加,合金断口形貌中的沿晶断口所占比例逐渐减少;当合金中的硼含量大于0.03wt.%后,断口形貌变为全部塑性的韧窝状断口.合金的断口形貌变化表明,有序态Ni3Fe合金中的硼提高了合金的晶界强度.硼对有序态Ni3Fe合金在氢气环境中力学性能和氢脆因子的作用变化表明,硼对有序态Ni3Fe合金中由氢气诱发的环境氢脆有较强的抑制作用.

关键词： Ni3Fe金属间化合物环境氢脆硼含量

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Incorporating Magnetic Hysteresis of Molecular Nanowire and Anisotropic thermal-Expansion-Induced Hysteretic Magnetic transition

Incorporating Magnetic Hysteresis of Molecular Nanowire and ...

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第七届全国物理无机化学学术会议

作者： t.liu L.Zhao State Key Laboratory of Fine Chemicals Dalian University of Technology

Magnetic bistable materials can potentially be used as memory and switch *** multifaceted materials by incorporating two or more hysteretic magnetic transitions that respond to different perturbations into a single material is *** this study,inorganic W-CoN-Fe chains were linked by ditopic organic ligands to a 3D framework,which exhibited both thermal hysteresis and

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CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds

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Particuology 2024年第5期88卷 266-281页

作者： Lin Jiang Mofan Qiu Rongzheng liu Bing liu Youlin Shao Malin liu Institute of Nuclear and New Energy technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

the spouted bed has been used in the coating process of high-density nuclear fuel *** particle fluidization behaviors in pseudo-2D and 3D spouted beds were simulated and *** effects of four independent variables(cone angle,particle density,inlet gas velocity,and particle loading)on particle fluidization behaviors in the 3D spouted bed were investigated *** cone angle effect on fluidization mechanism was studied quantitatively first time.A new fluidization quality index was proposed based on the particle entrainment principle,and an extreme value was obtained when the cone angle was 60°,considered to be the optimum value for the 3D conical spouted *** was indicated the gas–solid contact efficiency can be kept up if the gas velocity was proportional to ρ_(p)^(0.65) and N_(p)^(0.78) when the particle density or loading was *** results will be useful for geometry and operation parameters design of the 3D conical spouted bed and helpful for developing the fluidization mechanism of high-density particles.

关键词： Spouted bed High-density particle CFD-DEM Fluidization quality index Particle loading

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An XAFS measurement of copper thin film by a simple detector in total—electron—yield mode

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同步辐射装置用户科技论文集 2000年第1期 22-27页

作者： t.liu Y.N.Xie 等

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Lanthanide-based microlasers:Synthesis,structures,and biomedical applications

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Nano Research 2024年第1期17卷 97-111页

作者： Qian Zhang Yawei liu Kai liu Hongjie Zhang Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Xiangfu Laboratory Jiaxing 314102China

the large size of lasers limits their applications in confined spaces,such as in biosensing and in vivo brain tissue *** this regard,micron-sized lasers have been *** exhibit great potential for biological detecting,remote sensing,and depth tracking due to their small sizes,sensitive properties of their spectral fingerprints,and flexible positional modulation in the ***-based luminescent materials that possess long excited-state lifetime,narrow emission bandwidth,and upconversion behaviors are promising as gain mediums for novel *** addition,lanthanide-based microlasers could be generated under natural ambient conditions with pumped or continuous light sources,which significantly promotes the practical applications of *** progress in the design,synthesis,and biomedical applications of lanthanide-based microlasers has been outlined in this *** ions doped and upconverted lanthanide-based microlasers are highlighted,which exhibit advantageous structures,miniaturized dimensions,and high lasing *** applications of lanthanide-based microlasers are further discussed,the upconverted microlasers show great advantages for biological applications owing to their tunable excitation and emission characteristics and excellent environmental ***,perspectives and challenges in the field of lanthanide-based microlasers are presented.

关键词： microlasers lanthanide-based luminescent materials upconversion nanoparticles biological applications

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