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Microstructure evolution and hot deformation behavior of carbon nanotube reinforced 2009Al composite with bimodal grain structure

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Journal of Materials Science & Technology 2021年第11期70卷 73-82页

作者： K.Ma Z.Y.liu S.Bi x.x.Zhang B.l.xiao Z.Y.Ma Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of ScienceShenyang110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang110016China School of Materials Science and Engineering Guilin University of TechnologyGuilin541004China

The hot deformation behaviors of the bimodal carbon nanotube reinforced 2009Al(CNT/2009Al)composite were studied by establishing processing map and characterizing the microstructure *** results indicate that the grain size in the ultra-fine grained zones was stable during hot deformation,while the coarse grained zones were elongated with their long axis directions tending to be perpendicular to the compression *** temperature with high strain rate(lTHR),as well as high temperature with low strain rate(HTlR)could increase the length/width ratio of the coarse grained ***,lTHR and HTlR could cause the instable *** instable deformation at lTHR was induced by severe intragranular plastic deformation and the localized shear crack,while the instable deformation at HTlR resulted from the more deformation component at the coarse grained zones,and the micro-pore initiation due to CNT re-agglomeration at the boundaries between the coarse and the ultra-fine grained zones.

关键词： Carbon nanotube Bimodal Aluminum matrix composite Hot deformation Processing map

Topological Knots in Quantum Spin Systems

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Chinese Physics letters 2021年第6期38卷 7-12页

作者： x.M.Yang l.Jin Z.Song School of Physics Nankai UniversityTianjin 300071China

Knot theory provides a powerful tool for understanding topological matters in biology,chemistry,and *** knot theory is introduced to describe topological phases in a quantum spin *** solvable models with long-range interactions are investigated,and Majorana modes of the quantum spin system are mapped into different knots and *** topological properties of ground states of the spin system are visualized and characterized using crossing and linking numbers,which capture the geometric topologies of knots and *** interactivity of energy bands is *** gapped phases,eigenstate curves are tangled and braided around each other,forming *** gapless phases,the tangled eigenstate curves may form *** findings provide an alternative understanding of phases in the quantum spin system,and provide insights into one-dimension topological phases of matter.

关键词： topological quantum system

High throughput synthesis enabled exploration of CoCrFeNi-based high entropy alloys

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Journal of Materials Science & Technology 2022年第15期110卷 269-282页

作者： l.Zhao l.Jiang l.x.Yang H.Wang W.Y.Zhang G.Y.Ji x.Zhou W.A.Curtin x.B.Chen P.K.liaw S.Y.Chen H.Z.Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Metal Materials CharacterizationCentral Iron and Steel Research InstituteBeijing 100081China Institute for Advance Studies in Precision Materials Yantai UniversityYantai 264005China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China laboratory for Multiscale Mechanics Modeling Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland School of Engineering RMIT UniversityMelbourne 3046Australia Department of Materials Science and Engineering The University of Tennessee37996USA

To accelerate the exploration,screening,and discovery of structural high-entropy alloys with targeted properties,the newly developed High-Throughput Hot-Isostatic-Pressing based Micro-Synthesis Approach(HT-HIP-MSA)is employed to efficiently synthesize and characterize 85 combinatorial alloys in a 13-principal element alloying *** Co Cr Fe Ni-based high entropy alloys span 1 quaternary,9 quinary,and 36 senary alloy systems,and their composition-structure-property relationships are characterized and analyzed experimentally and *** the single-phase FCC CoCrFeNi alloy base,with Mn,Cu,Ti,Nb,Ta,Mo,W,Al,and Si as principal element alloying additions,we find(1)the extended Mn solubility in the single-phase FCC CoCrFeNi-Mn_(x) alloys,(2)the destabilizing behavior for most of the quinary and senary alloys,and(3)the distinctive solid-solution-strengthening effects in the *** combining the computational methods,the HT-HIP-MSA can be systematic and economic to explore and refine the compositions,structures,and properties of structural high-entropy alloys.

关键词： High-entropy alloys High-throughput Composition-structure-property

Design,synthesis and preliminary biological evaluation of brain targeting l-ascorbic acid prodrugs of ibuprofen

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Chinese Chemical letters 2013年第2期24卷 117-119页

作者： xue-Ying Wu xiao-Cen li Jie Mi Jing you li Hai College of Pharmacy Chengdu University of Traditional Chinese Medicine Key laboratory of Drug Targeting and Drug Delivery System of the Education Ministry Department of Medicinal ChemistryWest China School of PharmacySichuan University

Received 4 November 2012 Received in revised form 17 December 2012 Accepted 31 December 2012 Available online 4 February 2013

关键词： Vitamin CBrain targetProdrugGlUT1 transporterSVCT2 transporterIbuprofen

Redox properties of (RC2_R')Co_2(CO)_(6-n)_l_n and reactivity of (RC_2R')Co_2(CO)_(6-n)l_n^(?) towards PPh_3[l=PPh_3, P(OEt)_3]

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Chinese Journal of Chemistry 1991年第1期9卷 20-26页

作者： MENG Qing-Jin SUN Shou-Heng you xiao-Zeng Coordination Chemistry Institute Nanjing UniversityNanjing 210008

Cyclic voltammetric studies of clusters(C_6H_5-C_2C_6 H_4-R-p)Co_2(CO)_(6-n) l_n[n=0,2; l=PPh_3,P(OEt)_3] and(RCH_2C)_2Co_2(CO_4)(PPh_3)_2 on Pt electrode are described. The primary reduction(0/-1)and oxidation (+1/0) steps are considered as a mono-electron process for all clusters. For the clusters (C_6H_5C_2C_6H_4-R-P)Co_2(CO)_6, a good linear relation between reduction poten- tial EF_p^(red) and Hammett constant σp of R in the clusters is found. For the clusters(RC_2R′)Co_2(CO)_4l_2, their radical anions are extremely unstable at room temperature and fragment into a series of mono- nuclear species, one of which is(RC-3R′)Co(CO)_2PPh_3. The reaction of radical anions of (RC_2R’)- Co_2(CO)_(6-n) (PPh_3)_n(n=0,2) with PPh_3 also produces mononuclear species (RC_2R’)Co(CO)_2PPh_3 which has been detected by means of cyclic voltammetry and ESR. The influence of R on redox pro- perties of clusters is discussed.

关键词： Redox properties of OEt n)l_n CO

Enhanced Crystallization Rate of Poly(l-lactide)/Hydroxyapatite-graftpoly(D-lactide) Composite with Different Processing Temperatures

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Chinese Journal of Polymer Science 2020年第6期38卷 599-610页

作者： Min Wang lei-Chu you Yu-Qi Guo Ni Jiang Zhi-Hua Gan Zhen-Bo Ning State Key laboratory of Organic-Inorganic Composites Beijing Laboratory of Biomedical MaterialsCollege of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

Hydroxyapatite-graft-poly(D-lactide)(HA-g-PDlA)was synthesized by ring-opening polymerization with HA as initiator and stannous octanoate(Sn(Oct)2)as *** analysis(TGA)and Fourier transform infrared spectroscopy(FUR)results indicate that PDlA chains are successfully grafted onto HA particles by covalent *** two different processing temperatures(190 and 230℃),the effect of the grafted PDlA chains on the crystallization behavior of poly(l-lactide)/HA-g-PDlA(PllA/HA-g-PDlA)composite was investigated in the current study,comparing to neat PllA and its four composites(PllA/HA,PllA/HA-g-PllA,PllA/PDlA,and PllA/HA/PDlA).The crystallization rate of PllA/HA-g-PDlA composite is highly enhanced comparing to PllA,PllA/HA and PllA/HA-g-PllA composites in which there are no stereocomplex(SC)*** addition,when the processing temperature rises from 190℃ to 230℃,the acceleration of PllA crystallization in PllA/HA-g-PDlA composite is not influenced so much as other composites containing SC crystallites,such as PllA/HA/PDlA or PllA/*** differential scanning calorimetry(DSC)results demonstrate that even without SC crystallites,the crystallization of PllA can still be accelerated a lot in this *** may be related to the interaction between the grafted PDlA chains and the amorphous PllA chains in PllA/HA-g-PDlA *** isothermal crystallization kinetics studies indicate that the nature of nucleation and crystal growth of PllA/HAg-PDlA composite are more likely 3D crystalline growth with heterogeneous nucleation mode,which are different from PllA or other *** investigation could shed new light on the application of PllA/HA composites.

关键词： HA particles Stereocomplexation Composite Crystallization

Observation and Simulation of n=1 Reversed Shear Alfvén Eigenmode on the Hl-2A Tokamak

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Chinese Physics letters 2022年第10期39卷 26-33页

作者： P.W.Shi Y.R.Yang W.Chen Z.B.Shi Z.C.Yang l.M.Yu T.B.Wang x.x.He x.Q.Ji W.l.Zhong M.xu x.R.Duan Southwestern Institute of Physics Chengdu 610041China State Key laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

A branch of high-frequency Alfvenic modes is observed on the Hl-2A *** electromagnetic mode can be driven unstably in the plasma with an off-axis neutral beam *** mode frequency keeps almost unchanged or presents a slow-sweeping behavior,depending on the detail current *** poloidal and toroidal mode numbers are𝑚m/n=1/*** mode has a quite short duration(≤20 ms)and usually appears 5-10 ms after the neutral beam being injected into the *** simulations based on M3D-K have also been carried *** result suggests that co-passing energetic particles are responsible for the mode *** simulated mode structures are localized nearby location of minimum safety factor(q_(min))and agree with the structures obtained through tomography of soft x-ray ***,the modes are localized in the continuum gap and their frequencies increase with variation of𝑞min in a wide *** but not least,the characteristic of unchanged frequency on experiment is also reproduced by the nonlinear simulation with a fixed safety *** those evidences indicate that the𝑛n=1 high-frequency mode may belong to a reversed shear Alfven eigenmode.

关键词： Alfven mode unchanged

EFFECT OF CHEMICAl COMPOSITION AND PROCESSES ON THE TExTURE OF HOT-ROllED DEEP DRAWING STEEl SHEET

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Acta Metallurgica Sinica(English letters) 2002年第3期15卷 324-330页

作者： Y.Chen x.Chen C.Y.li x.Y.li Y.l.Kang Technical Center of Wuhan Iron and Steel Group Co. Wuhan 430080China Wuhan University of Science and Technology Wuhan 430080China Central General Iron and Steel Research Institute Beijing 100081China University of Science and Technology Beijing Beijing 100083China

A hot-rolled deep drawing(HDD)steel with high r-value and uniformdistribution of{111}texture in thickness was developed by hot rolling in ferrite region withlubricating between the roller and the *** experimental results show that the carbon contentand finish rolling temperature have significant effects on beneficial texture{111},and lubricatingduring hot rolling at low temperature in alpha-region makes the distribution of the *** basic requirements needed to meet for HDD steel were concluded by comparing differentcarbon contents and hot rolling processes.

关键词： ultra low carbon hot rolling in alpha-region lubricating r-value {111}texture

Evaluation of carbon-based nanosorbents synthesised by ethylene decomposition on stainless steel substrates as potential sequestrating materials for nickel ions in aqueous solution

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Journal of Environmental Sciences 2012年第9期24卷 1559-1568页

作者： x.J.lee l.Y.lee l.P.Y.Foo D.G.Hassell Department of Chemical and Environmental Engineering University of Nottingham Malaysia CampusJalan Broga43500 SemenyihSelangor Darul EhsanMalaysia.

The present work covers the preparation of carbon-based nanosorbents by ethylene decomposition on stainless steel mesh without the use of external catalyst for the treatment of water containing nickel ions （Ni2＋）. The reaction temperature was varied from 650 to 850℃, while reaction time and ethylene to nitrogen flow ratio were maintained at 30 rain and 1：1 cma/min, respectively. Results show that nanosorbents synthesised at a reaction temperature of 650℃ had the smallest average diameter （75 nm）, largest BET surface area （68.95 m2/g） and least amount of impurity （0.98 wt.% Fe）. A series of batch sorption tests were performed to evaluate the effects of initial pH, initial metal concentration and contact time on Ni2~ removal by the nanosorbents. The equilibrium data fitted well to Freundlich isotherm. The kinetic data were best correlated to a pseudo second-order model indicating that the process was of chemisorption type. Further analysis by the Boyd kinetic model revealed that boundary layer diffusion was the controlling step. This primary study suggests that the prepared material with Freundiich constants compared well with those in the literature, is a promising sorbent for the sequestration of Ni2＋ in aqueous solutions.

关键词： adsorption nanosorbent nickel ions isotherms kinetics