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Dislocation behavior in Cu single crystal joints under the ultrasonically excited high-strain-rate deformation

Journal of materials Science & technology 2023年第10期141卷 66-77页

作者： Qiuchen Ma Jingyuan Ma Jianli Zhou Xiaoxiong Zheng Hongjun Ji The State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology at ShenzhenShenzhen 518055China Sauvage Laboratory for Smart materials Shenzhen Key Laboratory of Flexible Printed Electronics TechnologySchool of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology at ShenzhenShenzhen 518055China

The coupling effects of ultrasonic excitation and high-strain-rate deformation are the core factors for weld formation during ultrasonic ***,interfacial deformation behavior still shrouds in uncer-tainty because of the contradictory features between mutual dislocation retardation caused by severely frictional deformation and ultrasonic-accelerated dislocation motion.[101]and[111]-oriented Cu single crystals which tended to form geometrically necessary boundaries(GNBs)were selected as the welding substrates to trace the uniquely acoustoplastic effects in the interfacial region under the ultrasonically excited high-strain-rate *** was indicated that for a low energy input,micro-welds localized at the specific interface region,and equiaxed dislocation cells substituting for GNBs dominated in the ini-tial single crystal rotation *** the welding energy increased,continuous shear deformation drove the dynamic recrystallization region covered by equiaxed grains to spread *** discrete dislocations inside the recrystallized grains and nascent dislocation cells at the grain boundaries were ob-served in[101]and[111]joints simultaneously,suggesting that the ultrasonic excitation promoted motion of intragranular dislocation and pile-up along the sub-grain *** interfacial morphology be-fore and after expansion of recrystallization region all exhibited the weakening of orientation constraint on dislocation motion,which was also confirmed by the similar micro-hardness in joint *** first-principle calculation and applied strain-rate analysis further revealed that ultrasonic excitation en-hanced dislocation slipping,and enabled dislocation motion to accommodate severe plastic deformation at a high-strain-rate.

关键词： Acoustoplasticity Ultrasonic welding Cu single crystal Dynamic recrystallization Dislocation cell High-strain-rate deformation

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Effects of lanthanum on hot deformation behaviour of Mn-Cr-Mo bainitic rail steel

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Journal of Rare Earths 2018年第7期36卷 772-780页

作者： Xirong Bao Jun'an Wang Xiaodong Wang Feng Guo Yongzhen Liu institute of materials School of Materials Science and EngineeringShanghai University School of Material and Metallurgy Inner Mongolia University of Science and Technology School of materials Science and Engineering Inner Mongolia University of Technology School of Mining and Coal Inner Mongolia University of Science and Technology

Effects of lanthanum（La） as micro-alloying element on the hot deformation behaviour of the high strength Mn-Cr-Mo bainitic rail steel were investigated under a range of deformation conditions. The results indicate that La increases the flow stress by 10-30 MPa through strengthening nanoscale strain induced precipitation（SIP） θ-（Fe,La）3 C during hot deformation. The hot deformation activation energy increases by 10-40 kJ/mol due to the ＂Zener effect＂ of SIP and the dynamic recrystallization（DRX） is retarded due to the competitive behaviour between SIP and DRX. Bainite plates in the DRX domain can be refined by adding La, resulting in the improvement of hot workability. The DRX domain with peak power dissipation efficiency of 52% is determined to be the optimal processing region for Mn-Cr-Mo-La bainitic rail steel.

关键词： Rare earth Hot deformation Strain induced precipitation Dynamic recrystallization Dissipation map Microstructure

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Formation of texture of Ni_(48)Mn_(31)Ga_(21) polycrystalline alloy by thermal simulation pack rolling technology

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中国有色金属学会会刊：英文版 2006年第4期16卷 843-847页

作者：卢斌王花宾刘岩刘吉轩王洪磊 School of materials Science and Engineering Central South University Changsha 410083 China Center of Research and Development of special materials Institute of Shanghai Silicate Research Chinese Academy of Scienc es Shanghai 200050 China

The hot deformation behavior of Ni48Mn31Ga21 alloy was studied by thermal simulation rolling technology. Microstructure evolution of the alloys under different rolling processes was studied by optical microscopy(OM) and X-ray diffractometry(XRD).The results show that, by thermal simulation pack rolling technology, textures appear in polycrystalline Ni48Mn31Ga21 alloy, and big cracks can be avoided under large deformation ratio. The rolling process with few passes and strong deformation makes Ni48Mn31Ga21 alloy obtain (202), (400) and (323) textures of martensitic variants more easily, especially (400) texture. Besides the interface between package materials and the Ni48Mn31Ga21 alloy is clear, which is beneficial for Ni48Mn31Ga21 alloy to separate from pack.

关键词： Ni-Mn-Ga 镍合金形状记忆合金热模拟轧制马氏体转变

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A review on the high energy oxidizer ammonium dinitramide:Its synthesis,thermal decomposition,hygroscopicity,and application in energetic materials

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Defence technology（防务技术） 2023年第1期19卷 163-195页

作者： Fu-yao Chen Chun-lei Xuan Qiang-qiang Lu Lei Xiao Jun-qing Yang Yu-bing Hu Guang-Pu Zhang Ying-lei Wang Feng-qi Zhao Ga-zi Hao Wei Jiang National special Superfine Powder Engineering technology Research Center Nanjing University of Science and TechnologyNanjingChina Xi'an Modern Chemistry Research institute Xi'anChina

Ammonium dinitramide(ADN)is considered as a potential substitute for ammonium perchlorate in energetic materials due to its high density,positive oxygen balance,and halogen-free ***,its application has been severely limited because of its strong hygroscopicity,difficult storage,and incompatibility with isocyanate curing *** order to better bloom the advantages of the highly energetic and environment-friendly ADN in the fields of energetic materials,an in-depth analysis of the current situation and discussion of key research points are particularly *** this paper,a detailed overview on the synthesis,thermal decomposition,hygroscopic mechanism,and antihygroscopicity of ADN has been discussed,its application in powdes and explosives are also presented,and its future research directions are proposed.

关键词： Ammonium dinitramide High energy oxidizer Synthesis Properties Applications

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Copper-catalyzed conjugate addition of allene-derived nucleophiles to alkenyl-substituted carboxamides

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Chinese Chemical Letters 2024年第3期35卷 239-242页

作者： Bin Fu Yue Zhao Xiuping Yuan Yanfei Li Jianjun Yin Simin Wang Tao Xiong Qian Zhang Jilin Province Key Laboratory of Organic Functional Molecular Design&Synthesis Department of ChemistryNortheast Normal UniversityChangchun 130024China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun 130012China

Catalytic Michael addition reaction represents a fundamental importance in organic synthetic *** corresponding conversions toward intrinsically low reactive enamide remains an ongoing *** herein report a copper-catalyzed conjugate addition of allenes toβ-substituted alkenyl amides,one of the most challenging Michael *** present method utilizes readily available allenes as the latent carbon-based nucleophiles and simple,commonβ-substituted alkenyl amides as starting materials,unlike previous methods that usually preinstall an activating group to improve the reactivity of amide or uses highly reactive stoichiometric quantities of ***,this approach shows good functional group compatibility and can be implemented under mild reaction conditions with excellent level of chemo-and regioselectivities.

关键词： CuH catalysis Allenes Unsaturated amide Conjugate addition Regioselectivity

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Optical and electrical properties of room temperature preparedα-IGZO thin films using an In_(2)Ga_(2)ZnO_(7) ceramic target

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Journal of Central South University 2022年第4期29卷 1062-1074页

作者： ZHANG Yu CHEN Jie SUN Ben-shuang LIU Shuai WANG Zhi-jun LIU Shu-han SHU Yong-chun HE Ji-lin School of materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China College of Sciences Xi’an Shiyou UniversityXi’an 710065China State Key Laboratory of special Rare Metal materials Northwest Rare Metal Materials Research InstituteShizuishan 753000China

In this study,a high-purity In_(2)Ga_(2)ZnO_(7) ceramic target was used to deposit indium gallium zinc oxide(IGZO)films by RF magnetron sputtering *** microstructure,growth state,optical and electrical properties of the IGZO films were *** results showed that the surface of the IGZO film was uniform and smooth at room *** the substrate temperature increased,the surface roughness of the film gradually *** room temperature to 300℃,all the films maintained amorphous phase and good thermal ***,the transmission in the visible region decreased from 91.93%to 91.08%,and the band gap slightly decreased from 3.79 to 3.76 *** characterization of the film via atomic force microscope(AFM)and X-ray photoelectron spectroscopy(XPS)demonstrated that the film prepared at room temperature exhibited the lowest surface roughness and the largest content of oxygen *** the rise in temperature,the non-homogeneous particle distribution,increase in the surface roughness,and reduction in the number of oxygen vacancies resulted in lower performance of theα-IGZO *** analysis showed that the best optical and electrical properties can be obtained by depositing IGZO films at room temperature,which indicates their potential applications in flexible substrates.

关键词： oxide ceramic sputtering film microstructure photoelectric performance

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Natural killer cell-derived extracellular vesicle significantly enhanced adoptive T cell therapy against solid tumors via versatilely immunomodulatory coordination

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Science China Chemistry 2021年第11期64卷 1999-2009页

作者： Weidong Nie Wenlin Fan Anqi Jiang Guanghao Wu Houli Liu Li-Li Huang Hai-Yan Xie School of materials Science and Engineering Beijing Institute of TechnologyBeijing100081China School of Life Science Beijing Institute of TechnologyBeijing100081China institute of Engineering Medicine Beijing Institute of TechnologyBeijing100081China

Insufficient tumor tropism,MHC classⅠmolecules(MHC-I)defects of tumor cells,and immunosuppressive tumor microenvironment(TME)seriously imperil the efficacy of adoptive T cell therapy on solid ***,natural killer cell-derived extracellular vesicle(Nev)is used as a versatile toolkit to synergistically improve adoptive T cell therapy for solid ***,Nev is modified with dibenzocyclooctynes(DBCO)linked with p H-sensitive benzoic-imine bonds;meanwhile,cytotoxic T lymphocyte(CTL)is decorated with azide *** CTL is armed with Nev(CTL-Nev)through the click chemistry *** systematic administration,Nev obviously promotes the tumor-targeting accumulation of CTL coming from its native tumor-tropism ***,the cleavage of benzoic-imine bonds in the slightly acidic TME leads to the release of Nev,which not only directly induces tumor apoptosis but also promotes the action of CTL via multiplex pathways,such as up-regulating the MHC-I expression on tumor cells,reprogramming tumor-associated macrophages from pro-tumoral M2 phenotypes to tumoricidal M1 *** all-around coordination of Nev with CTL results in potent tumor repression.

关键词： click chemistry adoptive T cell therapy natural killer cell extracellular vesicle tumor immunotherapy

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Heterostructured crystallization mechanism and its effect on enlarging the processing window of Fe-based nanocrystalline alloys

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Journal of materials Science & technology 2021年第9期68卷 53-60页

作者： Tao Liu Aina He Fengyu Kong Anding Wang Yaqiang Dong Hua Zhang Xinmin Wang Hongwei Ni Yong Yang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China GAS Key Laboratory of Magnetic materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081China Department of materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong Kong Special Administrative RegionChina

The harsh melt-spinning and annealing processes of high saturation magnetization nanocrystalline softmagnetic alloys are the biggest obstacles for their industrialization. Here, we proposed a novel strategy to enlarge the processing window by annealing the partially crystallized precursor ribbons via a heterostructured crystallization process. The heterostructured evolution of Fe_(84.75)Si_(2)B_(9)P_(3)_(C0.5)Cu_(0.75)(at.%)alloy ribbons with different spinning rate were studied in detail, to demonstrate the gradient nucleation and grain refinement mechanisms. The nanocrystalline alloys made with industrially acceptable spinning rate of 25-30 m/s and normal annealing process exhibit excellent magnetic properties and fine nanostructure. The small quenched-in crystals/clusters in the free surface of the low spinning rate ribbons will not grow to coarse grains, because of the competitive grain growth and shielding effect of metalloid elements rich interlayer with a high stability. Avoiding the precipitation of quenched-in coarse grains in precursor ribbons is thus a new criterion for the composition and process design, which is more convenient than the former one with respect to the homogenous crystallization mechanism, and enable us to produce high performance nanocrystalline soft-magnetic alloys. This strategy is also suitable for improving the compositional adjustability, impurity tolerance, and enlarging the window of melt temperature,which is an important reference for the future development of composition and process.

关键词： Nanocrystalline alloy Processing window Surface crystallization Soft-magnetic property Heterostructured crystallization

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Nitrogen-rich hierarchically porous carbon foams as high-performance electrodes for lithium-based dual-ion capacitor

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Journal of Energy Chemistry 2020年第9期29卷 187-194,I0006页

作者： Yue Chen Xiaoming Qiu Li-Zhen Fan Beijing Advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanxi Key Laboratory of New Energy materials and Devices Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Nitrogen-rich porous carbonaceous materials have shown great potential in energy storage and conversion applications due to their facile fabrication,high electronic conductivity,and improved hydrophilic ***,three-dimensional porous N-rich carbon foams are fabricated through a one-step carbonization-activation method of the commercial melamine foam,and displaying hierarchically porous structure(macro-,meso-,and micro-pores),large surface area(1686.5 m2 g^-1),high N-containing level(3.3 at%),and excellent *** as-prepared carbon foams as electrodes for quasi-solid-state supercapacitors exhibit enhanced energy storage ability with 210 F g^-1 and 2.48c at 0.1 A g^-1,and150 F g^-1 and 1.77 F cm^-2 at 1 A g^-1,***,as an electrode for lithium-based dual-ion capacitor,this distinctive porous carbon also delivers remarkable specific capacitance with 143.6 F g^-1 at0.1 A g^-1 and 116.2 F g^-1 at 1 A g^-*** simple preparation method and the fascinating electrochemical performance endow the N-rich porous carbon foams great prospects as high-performance electrodes for electrochemical energy storage.

关键词： Nitrogen-rich Carbon foam Hierarchically porous structure Dual-ion capacitor

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退火热处理对增材制造AlSi10Mg合金宏观和微观变形行为的影响

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金属学报 2024年第8期60卷 1091-1099页

作者：张星星 LUTZ Andreas 甘为民 MAAWAD Emad KRIELE Armin 中国科学院高能物理研究所多学科研究中心北京100049 Mercedes Benz AG Research and Development DepartmentLeibnizstr.271032 BöblingenGermany institute of materials Physics Helmholtz-Zentrum HereonMax-lanck-Str.121502 GeesthachtGermany German Engineering materials Science Centre(GEMS)at Heinz Maier-Leibnitz Zentrum(MLZ) Helmholtz-Zentrum Hereon85748 GarchingGermany

增材制造AlSi10Mg合金存在显著的残余应力,对零件的形状尺寸精度、服役安全性和抗腐蚀性能等产生不利影响。在实际应用中,对残余应力敏感的应用需采用去应力退火以消除残余应力。然而,目前对增材制造AlSi10Mg合金退火后力学特性的理解... 详细信息

增材制造AlSi10Mg合金存在显著的残余应力,对零件的形状尺寸精度、服役安全性和抗腐蚀性能等产生不利影响。在实际应用中,对残余应力敏感的应用需采用去应力退火以消除残余应力。然而,目前对增材制造AlSi10Mg合金退火后力学特性的理解还停留在宏观层面。为了更深入地揭示其微观力学行为与内在机制,本工作利用同步辐射X射线衍射技术,对合金进行原位变形研究,分析Al和Si相的晶格应变应力演化,明确各物相对合金加工硬化率的具体贡献,并对位错密度的演变进行了量化分析,从而阐明了退火热处理对增材制造AlSi10Mg合金载荷传递行为与位错行为的影响。

关键词：同步辐射X射线衍射原位变形增材制造 AlSi10Mg合金热处理

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