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Effects of deformation parameters on microstructure and mechanical properties of magnesium alloy AZ31B

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Rare metals 2006年第Z2期25卷 105-110页

作者： ZHANG Shaoming YANG Bicheng XU Jun SHI Likai CHEN Guoliang State Key laboratory for Advanced metals and Materials University of Science and Technology Beijing Beijing 100083 China General Research Institute for non-ferrous metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China General Research Institute for Non-Ferrous Metals Beijing 100088 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

Plastic deformation and dynamic recrystallization (DRX) behaviors of magnesium alloy AZ31B during thermal compression and extrusion processes were studied. In addition, effects of deformation temperature and rates on the microstructure and mechanical properties were investigated. The results show that the DRX grains nucleate initially at the primary grain boundaries and the twin boundaries, and the twinning plays an important role in the grain refinement. The DRX grain size depends on the deformation temperature and strain rate The average grain size is only 1 μm when the strain rate is 5 s-1 and temperature is 250 ℃. It is also found that the DRX grain can grow up quickly at the elevated temperature. The microstructure of extruded rods was consisted of tiny equal-axis DRX grains and some elongated grains. The rods extruded slowly have tiny grains and exhibit good mechanical properties.

关键词： magnesium alloy thermal simulation extrusion dynamic recystallization

Phosphorus-doped NiS_(2)electrocatalyst with a hybrid structure for hydrogen evolution

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Science China(Technological Sciences) 2022年第7期65卷 1506-1512页

作者： ZHOU Qi LIU HaoRui JIAO SunZhi FENG ChenChen State Key laboratory of Advanced Processing and Recycling of non-ferrous metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China College of Mechanical Engineering Longdong UniversityQingyang 745000China

In this article,P-NiS_(2)/Ni_(x)P electrocatalysts were synthesized by dealloying the Ni-Al precursor followed by phosphosulfide *** found that the hybrid structure of P-NiS_(2)/Ni_(x)P provides rich active sites for the surface hydrogen evolution reaction (HER),and the doping of P enhances the electronic conductivity of *** particular,the obtained electrode shows a low overpotential of 196 mV at 10 mA cm^(-2)and a small Tafel slope of only 110 mV dec^(-1)in the ***,longterm constant current electrolysis test experiments indicate that P-NiS_(2)/Ni_(x)P has good service *** research will help to open a new window on the design and fabrication of HER electrocatalysts.

关键词： nickle phosphosulfides hybrid structure hydrogen evolution reaction dealloying

Effect of high shear rate on solidification microstructure of semisolid AZ91D alloy

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中国有色金属学会会刊：英文版 2010年第S3期20卷 868-872页

作者：朱光磊徐骏张志峰刘国钧 General Research Institute for non-ferrous metals

To investigate the effects of rotation speed and shearing time on morphology of semisolid AZ91D alloy,experimental work was undertaken using a twin-screw slurry *** results show that increasing the rotation speed and reasonable time can give rise to substantial grain refinement during continuous shearing stage,which can be attributed to the increasing of effective nucleation rate caused by the extremely uniform temperature due to high shear rate and high degree of *** with low rotation speed at the same thermal condition,the analysis indicates that the microstructures obtained at high rotation speed are homogenous spherical and fine grains instead of dendritic or rosette and exhibits uniform distribution in the eutectic matrix.

关键词： semisolid high shear rate solidification AZ91D rotation speed

Effect of lanthanum addition on microstructure and corrosion behavior of Al-Sn-Bi anodes

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Journal of Rare Earths 2011年第2期29卷 129-132页

作者：侯德龙李德富韩莉纪连芹 General Research Institute for non-ferrous metals

Novel Al-Sn-Bi anodes with and without lanthanum （La） were *** evaluate the corrosion properties of the anodes,constant current and dynamic loop tests were carried out to determine its efficiency and corrosion *** microscopy （OM）,transmission electron microscopy （TEM） and energy spectrum analysis techniques were used to examine and analyze microstructure and corrosion behavior of the *** result showed that the Al-Sn-Bi anodes with La additions revealed higher current efficiency and anticorrosion in artificial *** phase of anodes with La additions got more homogenous than that without La *** grains were fined and the amount of segregation Fe-phase was reduced.

关键词： Al-Sn-Bi sacrificial anodes lanthanum microstructure comprehensive property rare earths

Microstructure and electrolysis behavior of self-healing Cu-Ni-Fe composite inert anodes for aluminum electrowinning

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International Journal of Minerals,Metallurgy and Materials 2018年第10期25卷 1208-1216页

作者： Ying Liu Yong-an Zhang Wei Wang Dong-sheng Li Jun-yi Ma State Key laboratory of non-ferrous metals and Processes General Research Institute for Nonferrous MetalsBeijing 100088China Zhengzhou non-ferrous metals Research Institute Co.Ltd.of CHALCO Zhengzhou 450041China

The microstructure evolution and electrolysis behavior of(Cu_(52)Ni_(30)Fe_(18))–x Ni Fe_2O_4(x=40wt%,50wt%,60wt%,and 70wt%)composite inert anodes for aluminum electrowinning were *** Fe_2O_4 was synthesized by solid-state reaction at 950°*** dense anode blocks were prepared by ball-milling followed by sintering under a N_2 *** phase evolution of the anodes after sintering was determined by scanning electron microscopy and energy-dispersive X-ray *** results indicate that a substitution reaction between Fe in the alloy phase and Ni in the oxide phase occurs during the sintering *** samples were also examined as inert anodes for aluminum electrowinning in the low-temperature KF–NaF–AlF_3 molten electrolyte for 24 *** cell voltage during electrolysis and the corrosion scale on the anodes were *** results confirm that the scale has a self-repairing function because of the synergistic reaction between the alloy phase with Fe added and the oxide *** estimated wear rate of the(Cu_(52)Ni_(30)Fe_(18))–50Ni Fe_2O_4 composite anode is 2.02 cm·a^(-1).

关键词： aluminum electrolysis inert anode composites aluminum electrowinning corrosion

Mn,N co-doped Co nanoparticles/porous carbon as air cathode for highly efficient rechargeable Zn-air batteries Hide Author's Information

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Nano Research 2022年第3期15卷 1942-1948页

作者： Hanzhen Zheng Fei Ma Hongcen Yang Xiaogang Wu Rui Wang Dali Jia Zhixia Wang Niandi Lu Fen Ran Shanglong Peng National&Local Joint Engineering laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China State Key laboratory of Advanced Processing and Recycling of non-ferrous metals School of Material Science and EngineeringLanzhou University of TechnologyLanzhou 730050China

Oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are generally catalyzed by precious metals(Pt)and metal oxides(IrO_(2))which still have many shortages including expensive price,poor selectivity and undesirable *** this work,we report a Mn0-doped CoN_(x) on N-doped porous carbon(Mn-CoN_(x)/N-PC)composite from carbonizing metal-organic framework(MOF)derivative as the dual-functional catalyst to boost both the ORR and OER *** to the strong coordination effect between nitrogen and metal elements,the introduction of N can obviously improve the content of Co-N-C active sites for ***,the Mn-doping significantly regulates the electronic structure of the Co element and increases the content of Co^(0) which provide efficient OER active ***-CoN_(x)/N-PC catalyst delivers super dual-functional activity with a half-wave potential of 0.85 V,better than the 20%Pt/C catalyst(0.82 V).When used in Zn-air batteries for testing,Mn-CoN_(x)/N-PC electrocatalyst shows a high power density(145 mW·cm^(−2))and good cycle performance.

关键词： bifunctional electrocatalysts Co-N-C Mn-doped Zn-air batteries

Energy Storage Mechanism of Vanadium Nitride via Intercalating Different Atomic Radius for Expanding Interplanar Spacing

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Energy & Environmental Materials 2022年第2期5卷 565-571页

作者： Ying Liu Lingyang Liu Long Kang Fen Ran State Key laboratory of Advanced Processing and Recycling of non-ferrous metals School of Material Science and EngineeringLanzhou University of TechnologyLanzhou 730050China Shandong Provincial Key laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China

As a promising anode material in supercapacitors,vanadium nitride has been widely concerned due to its ultra-high theoretical specific ***,its routine test capacitance value is still far from the theoretical value and its energy storage mechanism is *** order to solve these two key problems,here we prepare interplanar spacing expanded vanadium nitride materials with different impurity atoms intercalation from two anionic precursors of vanadium-based metal organic frameworks with different functional *** obtained vanadium nitride reaches a higher specific capacitance;and further,through ex situ X-Ray diffraction and in situ Raman,the charge storage of vanadium nitride is contributed by two processes:the first benefit is from the K^(+) de/intercalation in the interplanar spacing,and the other one is derived from the redox reaction with OH−by adsorption on ***,both of the first principle calculation and extended experiments support this *** believe that such detailed research on the energy storage mechanism can provide a clear idea for the application of metal nitrides in supercapacitors and other energy storage devices.

关键词： electrode materials energy storage mechanism supercapacitors vanadium nitride V-MOFs

Break-up Process of Perturbed Molten Metal Jet and Preparation of Lead-Free Solder Balls

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Journal of Rare Earths 2004年第Z2期22卷 174-177页

作者： He Lijun Zhang Shuguang Zhang Shaoming Xu Jun Shi Likai National Engineering Research Center for non-ferrous metals Composites General Research Institute for Non-Ferrous MetalsBeijing 100088China

Solder balls, which are used in advanced electronics packages such as BGA (Ball Grid Array) and CSP (Chip Scale Package) to substitute the leads and realize the electrical and mechanical connections between substrate and chip,have severe specifications in diameter tolerance, roundness and surface quality, and therefore challenge the traditional technologies for fabrication of metallic particles and powders. The present work made a survey of perturbed molten metal jet break-up process, observed the formation and growth of capillary wave of tin-lead melt jet by way of rapid solidification, and on the basis of the above research, successfully obtained tin-lead eutectic and Sn-4.0Ag-0.5Cu lead free solder balls with tight distribution and good sphericity of particles through optimization of processing parameters, forming a solid base for cost effectively producing solder balls.

关键词： solder balls jet break-up capillary wave perturbation

In Situ Transmission Electron Microscopy and Three-Dimensional Electron Tomography for Catalyst Studies

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Chinese Journal of Structural Chemistry 2022年第10期41卷 56-76页

作者： Chen Sun Kuo Liu Jian Zhang Qian Liu Xijun Liu Lili Han College of Chemistry Fuzhou UniversityFuzhou 350116China State Key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Key laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Institute for Advanced Study Chengdu UniversityChengdu 610106 China MOE Key laboratory of New Processing Technology for non-ferrous metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China

An in-depth understanding of the catalytic reaction mechanism is the key to designing efficient and stable catalysts. In situ transmission electron microscope(TEM) is the most powerful tool to visualize and analyze the microstructures of catalysts during catalysis. In situ TEM combined with three-dimensional(3D) electron tomography(ET) reconstruction technique enables interrogations of catalysts’ structural dynamics and chemical changes in high temporal and spatial dimensions. In this review, we discuss and summarize the recent advances in in situ TEM together with 3D ET for catalyst studies. Topics include the latest research progress of in situ TEM imaging as well as 3D visualization and quantitative analysis of catalysts. We also pay particular attention to artificial intelligence(AI)-enhanced smart 3D ET. These include deep learning(DL)-based data compression and storage for the analysis of large TEM data, recovery of wedge-shaped information lost in 3D ET reconstructions, and DL models for reducing residual artifacts in 3D reconstructed images. Finally, the challenges and development prospects of current in situ TEM and 3D ET research are discussed.

关键词： in situ TEM catalyst electron tomography 3D reconstruction artificial intelligence machine learning