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Acta Metallurgica sinica(English letters) 2008年第6期21卷 391-398页

作者： s.j. yao l.x. du x.h. liu g.d. wang state Key laboratory ofRolling and Automation Northeastern University Shenyang 110004 China

Three warm-rolled ferrite/pearlite microstructures were prepared by rolling at 500℃, and the austenitizing characteristics were discussed in conjunction with deformation during the heating stage. The results indicated that the final austenite grain size was sensitive to the deformation direction of the initial warm-rolled microstructure. The transient microstructure at a given temperature was the most important influencing factor on the austenitizing characteristic combined with deformation. Moreover, the hot-rolled mierostructure also had to be prepared in an optimal state because of its direct effect on the warm-rolled microstructure.

关键词： Warm-rolled ferrite/pearlite Austenite deformation Recrystallization

highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

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journal of Energy Chemistry 2025年第1期100卷 50-58页

作者： gaozhan liu jing Zhang jing Yang jinghui Chen xingyue xiao xiayin yao Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Center of Materials science and Optoelectronics Engineering University of Chinese Academy of Sciences

lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,li5.4Ps4.4Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m s cm-1and improved chemical stability is synthesized by iodine *** ultra-thin li5.4Ps4.4Cl1.4I0.2membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 ms cm-1and low areal resistance of 1.17Ω***,iodine doping could in-situ form liI at the lithium/electrolyte interface and improve the critical current density of li5.4Ps4.4Cl1.6from 0.8 to 1.35 mA *** resultant liCoO2/li5.4Ps4.4Cl1.4I0.2/li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g-1and a retention of 80.5% after 1000 *** addition,the assembled liCoO2/li5.4Ps4.4Cl1.4I0.2membrane/li pouch cell delivers an initial discharge capacity of 110.4 mA h g-1and 80.5% capacity retention after 100 cycles.

关键词： Argyrodite electrolytes Iodine doping Ionic conductivity stability All-solid-state lithium battery

The compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4h-pyran-4-one alleviates neuroinflammation and cognitive impairment in a mouse model of Alzheimer's disease

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Neural Regeneration Research 2025年第11期20卷 3330-3344页

作者： xueyan liu Wei Wu xuejuan li Chengyan wang Ke Chai Fanru Yuan huijuan Zheng Yuxing yao Chenlu li Zu-Cheng Ye daijun Zha department of Medicinal Chemistry School of PharmacyFujian Medical UniversityFuzhouFujian ProvinceChina Fujian Provincial Key laboratory of Brain Aging and Neurodegenerative diseases School of Basic Medical SciencesFujian Medical UniversityFuzhouFujian ProvinceChina Institute of laboratory Animal Center Fujian Medical UniversityFuzhouFujian ProvinceChina department of Neurosurgery Neurosurgery Research InstituteThe First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina department of hyperbaric Oxygen National Regional Medical CenterBinhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina

Previous studies have shown that the compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4h-pyran-4-one(d30),a pyromeconic acid derivative,possesses antioxidant and anti-inflammatory properties,inhibits amyloid-β aggregation,and alleviates scopolamine-induced cognitive impairment,similar to the phase Ⅲ clinical drug *** this study,we established a mouse model of Alzheimer's disease via intracerebroventricular injection of fibrillar amyloid-β to investigate the effect of d30 on fibrillar amyloid-β-induced *** results showed that d30 alleviated fibrillar amyloid-β-induced cognitive impairment,promoted fibrillar amyloid-β clearance from the hippocampus and cortex,suppressed oxidative stress,and inhibited activation of microglia and astrocytes.d30 also reversed the fibrillar amyloid-β-induced loss of dendritic spines and synaptic protein ***,we demonstrated that exogenous fibrillar amyloid-βintroduced by intracerebroventricular injection greatly increased galectin-3 expression levels in the brain,and this increase was blocked by *** the role of d30 in clearing amyloid-β,inhibiting neuroinflammation,protecting synapses,and improving cognition,this study highlights the potential of galectin-3 as a promising treatment target for patients with Alzheimer's disease.

关键词： Alzheimer's disease amyloid-β astrocyte cognitive impairment d30 dendritic spines galectin-3 microglia neuroinflammation neuron

Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions

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journal of Materials science & Technology 2019年第6期35卷 972-981页

作者： x.h. Zeng P. xue l.h. Wu d.R. Ni B.l. xiao K.s. wang Z.Y. Ma shenyang National laboratory for Materials science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of sciences Beijing 100049 China school of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

The microstructural evolution during friction stir welding(FsW) has long been studied only using one single welding parameter. Conclusions were usually made based on the final microstructure observation and hence were one-sided. In this study, we used the "take-action" technique to freeze the microstructure of an Al-Mg-si alloy during FsW, and then systematically investigated the microstructures along the material flow path under different tool rotation rates and cooling conditions. A universal characteristic of the microstructural evolution including four stages was identified, i.e. dynamic recovery(dRV), dislocation multiplication, new grain formation and grain growth. however, the dynamic recrystallization(dRx)mechanisms in FsW depended on the welding condition. For the air cooling condition, the dRx mechanisms were related to continuous dRx associated with subgrain rotation and geometric dRx at high and low rotation rates, respectively. Under the water cooling condition, we found a new dRx mechanism associated with the progressive lattice rotation resulting from the pinning of the second-phase *** on the analyses of the influencing factors of grain refinement, it was clearly demonstrated that the delay of dRV and dRx was the efficient method to refine the grains during FsW. Besides, ultra-high strain rate and a short duration at high temperatures were the key factors to produce an ultrafine-grained material.

关键词： Aluminum alloys grain refinement dynamic recrystallization severe plastic deformation Friction stir welding

A Novel design and Fabrication of Magnetic Random Access Memory Based on Nano-ring-type Magnetic Tunnel junctions

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journal of Materials science & Technology 2007年第3期23卷 304-306页

作者： x.F.han h.x.Wei Z.l.Peng h.d.Yang j.F.Feng g.x.du Z.B.sun l.x.jiang Q.h.Qin M.Ma Y.wang Z.C.Wen d.P.liu W.s.Zhan state Key laboratory of Magnetism Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100080 China

Nano-ring-type magnetic tunnel junctions （NR-MTjs） with the layer structure of Ta（5）/Ir22Mn78（10）/ Co75Fe25（2）/Ru（0.75）/CoooFe20B20（3）/Al（0.6）-oxide/Co60Fe20B20（2.5）/Ta（3）/Ru（5）（thickness unit： nm） were nano-fabricated on the si（100）/siO2 substrate using magnetron sputtering.d.position combined with the optical lithography, electron beam lithography （EBl） and Ar ion-beam etching techniques. The smaller NR-MTjs with the inner- and outer-diameter of around 50 and 100 nm and also their corresponding NR-MTj arrays were nano-patterned. The tunnelling magnetoresistance （TMR ＆ R） versus driving current （I） loops for a spin-polarized current switching were measured, and the TMR ratio of around 35% at room temperature were observed. The critical values of switching current for the free Co60Fe20B20 layer relative to the reference Co6oFe2oB2o layer between parallel and anti-parallel magnetization states were between 0.50 and 0.75 mA in such NR-MTjs. It is suggested that the applicable MRAM fabrication with the density and capacity higher than 256 Mbit/inch2 even 6 gbite/inch2 are possible using both I NR-MTj＋1 transistor structure and current switching mechanism based on based on our fabricated 4×4 MRAM demo devices.

关键词： Nano-ring-type magnetic tunnel junctions NR-MTj MRAM spin polarization spin transfer effect

Adiabatic shear instability in a titanium alloy:Extreme deformation-induced phase transformation,nanotwinning,and grain refinement

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journal of Materials science & Technology 2023年第19期150卷 104-113页

作者： x.R.guan Q.Chen s.j.Qu g.j.Cao h.wang A.h.Feng.d.l.Chen school of Materials science and Engineering Tongji UniversityShanghai 201804China southwest Technology and Engineering Research Institute Chongqing 400039China shanghai Key laboratory of d&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Key laboratory for light-weight Materials Nanjing Tech UniversityNanjing 210009China Interdisciplinary Center for Additive Manufacturing School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 2000093China department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)TorontoON M5B 2K3Canada

Increasingly harsh service conditions place higher requirements for the high strain-rate performance of titanium *** shear band(AsB),a phenomenon prone to dynamic loading,is often accom-panied by catastrophic ***,it is unclear how the internal nanostructures are related to shear *** we report detailed microstructural evolution in the AsB of a titanium alloy via in-depth focused ion beam(FIB),transmission Kikuchi diffraction(TKd),and high-resolution transmission electron microscope(hRTEM)analyses,with the deformation instability phenomenon discussed from the energy *** AsB interior undergoes multifaceted changes,namely deformation-induced beta-to-alpha transformation and deformation-induced martensitic transformation to form substantially refined and heterogeneous ***,two types of extremely fine twins are identified to occur within both nano-sized martensite and alpha *** critical plastic work representing the onset of adiabatic shear instability and dynamic equilibrium is observed to be constant for a specific structure in the same deformation *** energy analysis could be extended to other materials subjected to high strain-rate dynamic deformation.

关键词： Adiabatic shear instability deformation-induced phase transformation deformation-induced nanotwinning dynamic recovery Energy analysis

Critical transitions in the shape morphing of kirigami metallic glass

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journal of Materials science & Technology 2021年第2期61卷 204-212页

作者： d.x.h.n l.Zhao s.h.Chen g.wang K.C.Chan Advanced Manufacturing Technology Research Center Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HornKowloonHong KongChina school of Mechanical Engineering Hefei University of TechnologyHefei230009China laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai200444China

Kirigami, the ancient japanese paper cutting technique, has been applied to achieve high stretchability and low energy loss of designed metallic glass. despite the exploration of the underlying.d.formation mechanism of kirigami-inspired structures from the energy point of view, the morphable responses of the kirigami patterns and the origin of the kirigami response are yet to be fully understood. This study reveals the mechanical driven-forms of the kirigami structure with the corresponding.d.formation stages. Based on the beam deflection theory, the elastic buckling behavior of kirigami metallic glass is manifested and a critical force prediction model is developed. Moreover, a force concentration parameter is introduced in the rig.d.plastic deformation stage, predicting the nominal ultimate force. The kirigami-inspired facture force is firstly proposed. The findings of these models are in good agreement with the experimental sizedependent kirigami responses, and expected to provide significant insights into the understanding of the deformation behavior and the design of kirigami metallic glasses.

关键词： Metamaterial Kirigami metallic glass Critical load size effect Beam deflection

Influence of Re on the Properties of a NiCoCrAlY Coating Alloy

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journal of Materials science & Technology 2011年第5期27卷 408-414页

作者： j.j. liang h. We Y.l. Zhu x.F. sun Z.Q. hu M.s. dargusch x.d. yao Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China graduate school of Chinese Academy of sciences Beijing 100039 China school of Materials & Mining Engineering The University of Queensland QLD 4072 Australia

MCrAIY can serve as stand-alone overlay coatings or bond coats in thermal barrier coating systems, and its properties play a vital role in determining the performance of these coating systems. In order to further understand the behavior of MCrAIY coatings, several NiCoCrAIY model alloys with different levels of Re （0.3 wt%, O wt%, and 9 wt%） were investigated. Microstructural observation showed the addition of Re promoted the precipitation of Cr-rich phases, such as α-Cr and σ. The presence of α-Cr lowered the coefficient of thermal expansion （CTE） of the coating alloys, which could reduce the CTE mismatch at the scale-metal interface. The solid solution strengthening effect of Re is responsible for an increase in Rockwell hardness of the coating alloys. But the isothermal oxidation resistance at 1100℃ was deteriorated due to the precipitation of brittle α-Cr phase, a phase of inferior oxidation resistance compared with β-NiAI and γ-Ni.

关键词： NiCoCrAIY Phase constitution Oxidation Thermal expansion behavior hardness

Epitaxial growth and air-stability of monolayer Cu2Te

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Chinese Physics B 2020年第1期29卷 99-102页

作者： K Qian l gao h li s Zhang j h Yan C liu j O wang T Qian h ding Y Y Zhang x lin s x du h-j gao Institute of Physics&University of Chinese Academy of sciences Chinese Academy of SciencesBeijing 100190China Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China CAs Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

A new two-dimensional atomic crystal, monolayer cuprous telluride（Cu2Te） has been fabricated on a graphenesi C（0001） substrate by molecular beam epitaxy（MBE）. The low-energy electron diffraction（lEEd） characterization shows that the monolayer Cu2Te forms ■ superstructure with respect to the graphene substrate. The atomic structure of the monolayer Cu2Te is investigated through a combination of scanning tunneling microscopy（sTM） experiments and density functional theory（dFT） calculations. The stoichiometry of the Cu2Te sample is verified by x-ray photoelectron spectroscopy（xPs） measurement. The angle-resolved photoemission spectroscopy（ARPEs） data present the electronic band structure of the sample, which is in good agreement with the calculated results. Furthermore, air-exposure experiments reveal the chemical stability of the monolayer Cu2Te. The fabrication of this new 2d material with a particular structure may bring new physical properties for future applications.

关键词： cuprous telluride(Cu2Te) scanning tunneling microscopy(sTM) density functional theory(dFT) chemical stability

Characterization of high-pressure die-cast hypereutectic Al-si alloys based on microstructural distribution and fracture morphology

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journal of Materials science & Technology 2019年第6期35卷 1099-1107页

作者： x.Y. jiao j. wang C.F. liu Z.P. guo g.d. Tong s.l. Ma Y. Bi Y.F. Zhang s.M. xiong school of Materials science and Engineering Tsinghua University Beijing 100084 China state Key laboratory of Automobile safety and Energy Tsinghua University Beijing China China FAW Foundry Co. Ltd. Changchun 130011. China

The fracture behavior of high-pressure die-cast hypereutectic(hPdC) Al-si alloys was investigated using a high-resolution laboratory CT and synchrotron x-ray tomography with a particular focus on the influence of hPdC microstructure. Results showed that microstructure of the alloy was mainly comprised of primary silicon particles(PsPs), Al dendrites, Cu-rich phases and pores. Most of the coarse PsPs, Cu-rich phases and pores were located in the center of the specimen. The rapid solidification of hPdC led to a heterogeneous microstructural feature. Elemental Cu was enriched in the frontiers of solid-liquid interface, causing the formation of large size dendritic arms. The pores were formed in the interdendrites which endured high stress intensity under high applied stress. Microcracks were originated from pores and further connected Cu-rich phases causing intergranular fracture. PsPs worked as obstacles causing piling-up dislocations in the phase interface. In the regions where large size of PsPs enriched in, PsPs ruptured rather than debonded from matrix, indicating transgranular fractures of PsPs. Microcracks originated around pores and PsPs tended to converge on the main cracks to decrease the energy required for crack propagation.

关键词： hypereutectic Al-si alloy Primary silicon particles Porosity Fracture morphology high pressure die casting