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solid-state phase transformation of TC11 titanium during unstable thermal cycling in laser melting deposition process

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Journal of Iron and Steel Research International 2019年第7期26卷 743-750页

作者： Xiao-dong Li Jin Liu Yan-yan Zhu Xu Cheng Dong Liu Ji-kui Zhang National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Yuding Additive Manufacturing Research Institute Co. Ltd. Beijing 100096 China School of Aircraft Design Beihang University Beijing 100191 China

Thermal cycling procedure during laser additive manufacturing (LAM) process causes the appearance of bright and dark patterns on the etched surface of TC11 alloy components. The formation mechanisms of these patterns and the solid-state transformation related to LAM process are systematically investigated with the predication of temperature fields using the finite element software ABAQUS. The results indicate that by increasing subsequent thermal cycles, the peak temperatures for every cycle decrease. When peak temperatures are above Tβ(phase transition temperature of β phase), which is 1010℃ in TC11 alloy, no pattern is observed. Meanwhile, a decrease in peak temperature leads to appearance of an ultrafine basket-weave α+β microstructure (dark contrast) with gradually increased amount of α colonies in the alloy. A special bimodal microstructure with ‘fork-like'α lamella appears in the layer when the peak temperatures of thermal cycles firstly fall into α+β dual-phase region. And this special bimodal microstructure gives a bright contrast and only appears at the region where the peak temperatures are below 970℃, leaving the rest region with a dark contrast. With the continuous increase in thermal cycles in α+β dual-phase region,α lamella gradually coarsens. After five thermal cycles in α+β two-phase region, no further changes in microstructure are observed, and the morphologies of α lamella in dark and bright regions are almost the same but with different amounts of α phase.

关键词： Thermal cycling Laser melting deposition TC11 solid-state phase transformation Temperature field

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solid-state NMR for metal-containing zeolites:from active sites to reaction mechanism

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Frontiers of Chemical Science and Engineering 2020年第2期14卷 159-187页

作者： Xingling Zhao Jun Xu Feng Deng National Center for Magnetic Resonance in Wuhan State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsCAS Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

Metal-containing zeolite catalysts have found a wide range of applications in heterogeneous *** understand the nature of metal active sites and the reaction mechanism over such catalysts is of great importance for the establishment of structure-activity *** advanced solid-state NMR(SSNMR)spectroscopy is robust in the study of zeolites and zeolite-catalyzed *** this review,we summarize recent developments and applications of SSNMR for exploring the structure and property of active sites in metal-containing ***,detailed information on host-guest interactions in the relevant zeolite catalysis obtained by SSNMR is also ***,we highlight the mechanistic understanding of catalytic reactions on metal-containing zeolites based on the observation of key surface species and active intermediates.

关键词： metal-containing zeolites solid-state NMR active site host-guest interaction reaction mechanism

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solid-state nanopores for ion and small molecule analysis

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Chinese Chemical Letters 2019年第9期30卷 1607-1617页

作者： Qi Zhang Yue Cheng Peisheng Cao Zhiyuan Gu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Collaborative Innovation Center of Biomedical Functional Materials College of Chemistry and Materials Science Nanjing Normal University

solid-state nanopore in analytical chemistry has developed rapidly in the 1990s and it is proved to be a versatile new tool for bioanalytical chemistry. The research field of solid-state nanopore starts from mimicking the biological nanopore in living cells. Understanding the transport mechanism of biological nanopore in vivo is a big challenge because of the experimental difficulty, so it is essential to establish the basic research of artificial nanopores in vitro especially for the analysis of ions and small molecules. The performance of solid-state nanopores could be evaluated by monitoring currents when ions and molecules passed through. The comparison of the two types of nanopores based on current-derived information can reveal the principle of biological nanopores, while the solid-state nanopores are applied into practical bioanalysis. In this review, we focus on the researches of the solid-state nanopores in the fabrication process and in the analysis of ions and small molecules. Fabrication methods of nanopores,ion transport mechanism, small molecule analysis and theoretical studies are discussed in detail.

关键词： solid-state nanopores Single nanopore Ion Small molecule Nonlinear current-voltage curves Ionic current rectification

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solid-state emissive biphenylene bridged bisaroyl-S,N-ketene acetals as distinct aggregation-induced enhanced emitters and fluorometric probes

Aggregate

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Aggregate 2021年第5期2卷 179-184页

作者： Lukas Biesen Thomas J.J.Muller Institut fur Organische und Makromolekulare Chemie Heinrich-Heine-Universitat DusseldorfDüsseldorfGermany

Biphenylene bridged bisaroyl-S,N-ketene acetals can be readily synthesized by a one-pot Masuda borylation-Suzuki arylation sequence,thus,yielding a library of 20 bisaroyl-S,N-ketene acetals with tunable solid-state emission and aggregationinduced enhanced emission characteristics depending on the para substituents in the starting *** applications as fluorometric probe of alcoholic beverages are outlined.

关键词： aggregation-induced emission aroyl-S N-ketene acetals liquor sensors one-pot reaction solid-state

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solid-state fermented plant protein sources in the diets of broiler chickens:A review

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Animal Nutrition 2019年第4期5卷 319-330页

作者： Oladapo Olukomaiya Chrishanthi Fernando Ram Mereddy Xiuhua Li Yasmina Sultanbawa Centre for Nutrition and Food Sciences Queensland Alliance for Agriculture and Food Innovation(QAAFI)The University of QueenslandArcherfield BCQLD4108Australia Department of Agriculture and Fisheries The University of QueenslandArcherfield BCQLD4108Australia Poultry Science Unit School of Agriculture and Food SciencesThe University of QueenslandQLD4343Australia

Protein sources are the second most important component in poultry *** to the fluctuation in price of soybean meal(SBM) and persistent increase in feed prices,nutritionists have been exploring alternative protein *** of SBM with alternative protein sources in poultry diets could reduce human-live stock competition for soybean and support the production of more animal ***,the use of alternative protein sources is limited to low inclusion due to the presence of antinutritional factors(ANF) such as glucosinolates(rapeseed meal),gossypol(cottonseed meal),nonstarch polysaccharides(NSP) in lupin flour,high fibre(palm kernel cake),total phenolic contents and phytic acid(canola meal) known to impair animal performance,nutrient digestibility and feed *** a processing technique,solid-state fermentation(SSF) has been researched for a long time in the food *** important objective of SSF is the production of enzymes,organic acids and other metabolites of economic *** recent times,SSF has been employed to enhance nutrient bioavailability,inhibit gut pathogenic bacteria and reduce ANF in plant protein sources resulting in improved nutrient digestibility,thereby improving performance and gut health of broiler *** pigs,there is still a dearth of information on feeding solid-state fermented feed ingredients to broiler *** review aims to describe the nutritional value of the solid-state fermented products of rapeseed meal,canola meal,cottonseed meal,palm kernel cake and lupin flour on performance and intestinal health of broiler chickens.

关键词： Anti-nutritional factor Broiler chicken Nutritional value Protein source solid-state fermentation

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Designing solid-state interfaces on lithium-metal anodes: a review

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Science China Chemistry 2019年第10期62卷 1286-1299页

作者： Chen-Zi Zhao Hui Duan Jia-Qi Huang Juan Zhang Qiang Zhang Yu-Guo Guo Li-Jun Wan Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China

Li-metal anodes are one of the most promising energy storage systems that can considerably exceed the current technology to meet the ever-increasing demand of power applications. The apparent cycling performances and dendrite challenges of Li-metal anodes are highly influenced by the interface layer on the Li-metal anode because the intrinsic high reactivity of metallic Li results in an inevitable solid-state interface layer between the Li-metal and electrolytes. In this review, we summarize the recent progress on the interfacial chemistry regarding the interactions between electrolytes and ion migration through dynamic interfaces. The critical factors that affect the interface formation for constructing a stable interface with a low resistance are reviewed. Moreover, we review emerging strategies for rationally designing multiple-structured solid-state electrolytes and their interfaces, including the interfacial properties within hybrid electrolytes and the solid electrolyte/electrode interface. Finally, we present scientific issues and perspectives associated with Li-metal anode interfaces toward a practical Li-metal battery.

关键词： lithium-metal anode solid-state electrolyte energy chemistry rechargeable lithium-metal batteries solid electrolyte/electrode interface

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Particles in composite polymer electrolyte for solid-state lithium batteries:A review

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Particuology 2022年第1期20卷 14-36页

作者： Nan Meng Xiaogang Zhu Fang Lian School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

solid-state lithium batteries(SSLBs)have been identified as one kind of the most promising energy conversion and storage devices because of their safety,high energy density,and long cycling *** development of solid-state electrolyte is vital to commercialize *** polymer electrolyte(CPE),derived by compositing inorganic particles into solid polymer electrolyte has become the most practical species for SSLBs because it inherits the advantages of polymer electrolyte and simultaneously achieves enhanced ionic conductivity and mechanical *** characteristics of inorganic particles and their interaction with polymers strongly impact the performance of CPE,improving its ionic conductivity,mechanical properties,thermal and electrochemical stability,as well as interface compatibility with both *** this review,the effects of particle characteristics including its species,size,proportion,morphology on the ionic conductivity and mechanical properties of CPE are ***,some novel composite strategies are also introduced including surface modification,hybridization,and alignment of particles in polymer matrices,as well as some new preparation methods of *** interactions between particles and other components in CPE including polymer matrices or lithium salt are particularly focused herein to reveal the lithium conductive ***,a perspective on the direction of future CPE development for SSLBs is presented.

关键词： Particles Composite polymer electrolyte Ionic conductivity Interaction Interface solid-state

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Integrated Extrusion-Shear Forming Process of the solid-state Recycled AZ80 Magnesium Alloy via Hot Press Sintering

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 351-361页

作者： Bing Li Bugang Teng Baoting Zhang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

The consolidation recycled AZ80 billets were successfully fabricated through the cold press and hot press sintering of the AZ80 metal *** consolidation recycled billets sintered at 350℃present the comparable compressive properties and inferior tensile properties compared with the initial cast *** defects in the consolidation recycled billet were inclined to propagate along the bond interface between the metal chips during tension,which resulted in the inferior tensile properties of the recycled *** recycled billets were then subjected to the integrated extrusion-shear(ES) *** homogeneous finer dynamic recrystallization grains with an average grain size of 6 μm can be obtained in the shear deformation zone and extrusion sizing zone through integrated ES process at 300℃with an extrusion velocity of 0.6 mm/*** recycled billets after integrated ES forming process present rival tensile properties compared with the initial cast billets after integrated ES forming with the same extrusion parameters,which can be ascribed to that the integrated ES forming can nearly eliminate the defects through the severe compressive and shear *** solid-state recycling process through hot press sintering and subsequent integrated ES process can fabricate the consolidation recycled AZ80 rod,which demonstrates the comparable tensile properties with the cast-extrusion rod.

关键词： solid-state recycling Hot press sintering Integrated extrusion-shear forming Metal chips Mechanical properties

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Pinpointing and scheduling access conflicts to improve internal resource utilization in solid-state drives

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Frontiers of Computer Science 2019年第1期13卷 35-50页

作者： Xuchao XIE Liquan XIAO Dengping WEI Qiong LI Zhenlong SONG Xiongzi GE College of Computer National University of Defense TechnologyChangsha 410073China Department of Computer Science University of MinnesotaMinneapolisMN 55455USA

Modern solid-state drives (SSDs)are integrating more internal resources to achieve higher *** accesses across internal resources can potentially enhance the performance of ***,exploiting parallelism inside SSDs is challenging owing to real-time access *** this paper,we propose a highly parallelizable I/O scheduler (PIOS)to improve internal resource utilization in SSDs from the perspective of I/O ***, we first pinpoint the conflicting flash requests with precision during the address translation in the Flash Translation Layer (FTL).Then,we introduce conflict eliminated requests (CERs)to reorganize the I/O requests in the device-level queue by dispatching conflicting flash requests to different *** to the significant performance discrepancy between flash read and write operations,PIOS employs differentiated scheduling schemes for read and write CER queues to always allocate internal resources to the conflicting CERs that are more *** small dominant size prioritized scheduling policy for the write queue significantly decreases the average write *** high parallelism density prioritized scheduling policy for the read queue better utilizes resources by exploiting internal parallelism *** evaluation results show that the paralle/izable I/O scheduler (PIOS)can accomplish better SSD performance than existing I/O schedulers implemented in both SSD devices and operating systems.

关键词： solid-state drive access conflict I/O scheduler internal resource utilization PIOS

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Synthesis and characterization of (Ni,Sb)-co-doped rutile ceramic pigment via mechanical activation-assisted solid-state reaction

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Particuology 2018年第6期16卷 20-29页

作者： Shi Zhang Zhidong Pan Yanmin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

(Ni,Sb)-co-doped rutile yellow ceramic pigments were synthesized via a mechanical activation-assisted solid-state reaction in a stirred bead *** effects of mechanical grinding of the raw materials on the synthesis of (Ni,Sb)-co-doped rutile pigment were *** results show that mechanical activation effectively decreased the crystallinity of the mixed precursors,thus enhancing their reactivity and the migration rate of *** effects lowered the temperature required for formation of the rutile *** with results from a mixture of separately ground precursors,the mixture of raw materials ground together was more effective for accelerating nickel/antimony ions doping into the TiO2structure and improved the color performance of the *** pigment from the mixed raw materials ground for 2.0h and heat-treated at 1100℃ could be used as an environmentally-friendly ceramic yellow pigment owing to its low-toxicity,bright yellow hue,good chemical/thermal durability, and high cost-effectiveness.

关键词： Mechanical activation solid-state synthesis (Ni,Sb)-co-doped rutile Ceramic pigment

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