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材料科学技术（英文版）
材料科学技术（英文版）

胡壮麟

月刊

1005-0302

jmst@imr.ac.cn

024-83978208

110016

沈阳市沈河区文化路72号

材料科学技术（英文版）/Journal Journal of Materials Science & TechnologyCSCDCSTPCD北大核心EISCI
查看更多>>本刊简称《JMST》，（ISSN 1005-0302，CN 21-1315/TG）。1985年创刊。是中国科协主管，中国金属学会，中国材料研究学会和中国科学院金属研究所联合主办的国际性英文期刊，以“加强国际交流，扩大学术影响，服务经济建设”为办刊宗旨，刊登世界各国的具有创新性和较高学术水平的原始性论文，并设有物约综述、快报、简讯及国内外材料界杰出学者简介等栏目，内容包括金属材料、无机非金属材料、复合材料及有机高分子材料等。
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    Nature inspired hierarchical structures in nano-cellular epoxy/graphene-Fe3O4 nanocomposites with ultra-efficient EMI and robust mechanical strength

    Xun FanFengchao WangQiang GaoYu Zhang...
    177-185页
    查看更多>>摘要：Hierarchical layered structures,whether in a compact form like nacre or a porous manner like bone,are well known for their combined features of high stiffness,strength,and lightweight,inspiring many man-made materials and structures for high performance applications.The use of nacre/bone like hier-archical structures in polymer nanocomposites can achieve excellent mechanical and functional proper-ties with high filler volume fractions after carefully aligning functional nanofillers,although the fabri-cation and processing remain a great challenge.In this work,a bio-inspired lightweight nano-cellular epoxy/graphene-Fe3O4 nanocomposite with high nanofiller loading of 75 wt.％was successfully fabri-cated by combining features from both nacre and bone structures,via a simple compression molding process together with an eco-friendly supercritical CO2 foaming process to achieve robust mechanical strength and excellent electromagnetic interference(EMI)shielding effectiveness(SE)simultaneously.Highly aligned graphene-Fe3O4 nanoplatelets with well controlled nanoscale porous structures(52.6 nm)enabled both low density(1.26 g/cm3)and high specific EMI SE＞5200 dB/cm2/g,as well as preserved tensile strength of 67 MPa.This study provides a sustainable route to fabricate nature mimicked struc-tures with high performance and high flexibility for a wide range of applications,from portable electron-ics to healthcare devices.
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    Microstructure and strengthening mechanism of hot-extruded ultralight Mg-Li-Al-Sn alloys with high strength

    Gang ZhouYan YangHanzhu ZhangFaping Hu...
    186-196页
    查看更多>>摘要：Duplex-structured Mg-7Li-2Al-1.5Sn alloys with high strength were fabricated and their strengthening mechanism was investigated.The Mg-7Li-2Al-1.5Sn alloys were prepared by casting and extruded at the temperature of 533 K with an extrusion ratio of 25:1.The microstructure and mechanical properties of Mg-7Li-2Al-1.5Sn alloys were systematically investigated by OM,XRD,SEM,TEM,and tensile tests.The re-sults show that Mg-7Li-2Al-1.5Sn alloys are mainly composed of α-Mg,β-Li,LiMgAl2,Mg2Sn and Li2MgSn phases.The yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the extruded al-loy at room temperature reach 250 MPa,324 MPa and 11.9％,respectively.A lot of Sn-rich precipitates(Mg2Sn and Li2MgSn)are precipitated during extrusion with an average size of～14 nm,which is ben-eficial to the grain refinement.Dynamic recrystallization occurs during hot deformation and the nano-precipitates effectively refine the dynamic recrystallized(DRXed)grains.Besides,the residual dislocations existed in DRXed and un-DRXed grains result in the dislocation strengthening in the extruded alloy.Mg-7Li-2Al-1.5Sn alloys possess excellent high-temperature mechanical properties with the YS,UTS and EL of 200 MPa,237 MPa and 26.7％at 423 K,respectively.Sn-rich precipitates with good thermal stability can effectively prevent grain growth,which is good for the improvement of the high-temperature perfor-mance of Mg-Li-Al-Sn alloy.
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    The effect of melt flow induced by RMF on the meso-and micro-structure of unidirectionally solidified Al-7wt.％Si alloy Benchmark experiment under magnetic stirring

    Zs.VeresA.RoószA.Rónaf?ldiA.Sycheva...
    197-208页
    查看更多>>摘要：During the last two decades,many algorithms were developed to simulate the solidification process for different casting methods like ingots,continuous casting of steel and the direct chill cast of aluminum.Experiments performed under exactly known conditions and with the detailed knowledge of meso-and micro-structures are required for validating these simulations.The aim of this paper is to give a data set to validate these simulations.Unidirectional solidification experiments were performed by using a rotat-ing magnetic field(RMF)to study the effect of melt flow on the solidified micro-and meso-structure of the Al-7wt.％Si binary alloy.The first and the third 1/3 parts of samples were solidified without magnetic stirring,and the second(middle)1/3 part was solidified by using magnetic stirring.The mag-netic induction was 10 mT,the temperature gradient was～7 K/mm,and the sample movement velocity was 0.1 mm/s.On the longitudinal section of the sample,the columnar/equiaxed transition(CET),the equiaxed/columnar transition(ECT),the secondary dendrite arm spacing(SDAS),and the macrosegrega-tion(concentration distribution and the amount of eutectic)were investigated.The primary dendrite arm spacing(PDAS)and the grain structure were studied on the cross-section after color etching.
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    Fabrication of three dimensional SiC@C hybrid for efficient direct dehydrogenation of ethylbenzene to styrene

    Jiashun WangLinlin WangJiangyong DiaoXi Xie...
    209-214页
    查看更多>>摘要：Synthesis of hybrid carbon materials with core-shell structure and robust catalytic performance is of great research interest,and remains a great challenge in catalytic dehydrogenation of hydrocarbons reaction.In this paper,few-layer sp2 carbon decorated SiC nanocrystals with core-shell structure(SiC@C)were fab-ricated through a dual-confined magnesiothermic method by employing glucose and SiO2 as precursors.The SiC@C nanocrystals were further crosslinked to be a three dimensional(3D)mesoporous hybrid by the in situ generated carbon as binders and exhibiting a 410.30 m2 g-1 large surface area.The as-prepared SiC@C hybrid materials as metal-free catalysts were evaluated in the steam-free direct dehydrogenation of ethylbenzene to styrene.Benefiting from the abundant surface carbonyl groups on the graphite carbon layers,the optimized yield rate of styrene normalized by carbon mass was as high as 11.58 mmol g-1 carbon h-1,nearly 4 times that of nanodiamonds.Considering the low cost and excellent catalytic activity,the hybrid 3D SiC@C material may be a promising candidate for direct dehydrogenation of hydrocarbons.
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    Low temperature synthesis of high-entropy(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers by a novel electrospinning method

    Yan XingWenqing DanYicun FanXing'ao Li...
    215-220页
    查看更多>>摘要：High-entropy ceramics(HECs)show outstanding properties such as amorphous-like thermal conduc-tivities,colossal dielectric constant,superionic conductivity,enhanced electromagnetic wave absorption ability,super hardness and strength,which are promising for structural and functional applications.However,the high synthesis temperature has become the bottleneck that hinders the scale-up pro-duction and practical applications of HECs.It is thus appealing to develop a novel low-temperature process for the synthesis of HECs.To demonstrate the feasibility of low-temperature synthesis,herein,an electrospinning method has been utilized,for the first time,for the synthesis of high-entropy(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers.It has been found that after electrospinning from liquid precur-sors single phase(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 solid solution with bixbyite structure can be formed by calcining at a temperature as low as 500℃,which is at least about 1000℃lower than that used in the solid-state synthesis method.The as-prepared(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers are continuous and uniform with a smooth surface and a small diameter of 150 nm.It is also intriguing that the average grain size of(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 is only about 10 nm,which is much smaller than that in the solid-state synthesized powders.In addition,all the elements are homogeneously distributed along the nanofibers.This work demonstrates that high-entropy ceramic nanofibers can be synthesized from liquid precursors at low temperatures through a simple,efficient,and low-cost electrospinning method,which opens up a new avenue for the low-temperature synthesis of HECs.
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    Terminal sulfur atoms formation via defect engineering strategy to promote the conversion of lithium polysulfides

    Yuanchang LiWenda LiXiujuan YanZhenfang Zhou...
    221-231页
    查看更多>>摘要：The defect engineering shows great potential in boosting the conversion of lithium polysulfides interme-diates for high energy density lithium-sulfur batteries(LSBs),yet the catalytic mechanisms remain un-clear.Herein,the oxygen-defective Li4Ti5O12-x hollow microspheres uniformly encapsulated by N-doped carbon layer(OD-LTO@NC)is delicately designed as an intrinsically polar inorganic sulfur host for the research on the catalytic mechanism.Theoretical simulations have demonstrated that the existence of oxygen deficiencies enhances the adsorption capability of spinel Li4Ti5O12 towards soluble lithium poly-sulfides.Some-S-S-bonds of the Li2S6 on the defective Li4Ti5O12 surface are fractured by the strong adsorption force,which allows the inert bridging sulfur atoms to be converted into the susceptible ter-minal sulfur atoms,and reduces the activation energy of the polysulfide conversion in some degree.In addition,with the N-doped carbon layer,secondary hollow microspheres architecture built with primary ultrathin nanosheets provide a large amount of void space and active sites for sulfur storage,adsorption and conversion.The as-designed sulfur host exhibits a remarkable rate capability of 547 mAh g-1 at 4 C(1 C=1675 mA g-1)and an outstanding long-term cyclability(519 mAh g-1 after 1000 cycles at 3 C).Besides,a high specific capacity of 832 mAh g-1 is delivered even after 100 cycles under a high sulfur mass loading of 3.2 mg cm-2,indicating its superior electrochemical performances.This work not only provides a strong proof for the application of oxygen defect in the adsorption and catalytic conversion of lithium polysulfides,but offers a promising avenue to achieve high performance LSBs with the material design concept of incorporating oxygen-deficient spinel structure with hierarchical hollow frameworks.
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    Defect engineering of water-dispersible g-C3N4 photocatalysts by chemical oxidative etching of bulk g-C3N4 prepared in different calcination atmospheres

    Thi Kim Anh NguyenThanh-Truc PhamBolormaa GendensurenEun-Suok Oh...
    232-243页
    查看更多>>摘要：In this study,water-dispersible graphitic carbon nitride(g-C3N4)photocatalysts were successively pre-pared through the chemically oxidative etching of bulk g-C3N4 that was polymerized thermally in dif-ferent calcination atmospheres such as air,CO2,and N2.The different calcination atmospheres directly influenced the physicochemical and optical properties of both bulk and water-dispersible g-C3N4,chang-ing the photocatalytic degradation behavior of methylene blue(MB)and tetracycline hydrochloride(TC-HCl)for water-dispersible g-C3N4.The bubble-burst process in the thermal polymerization of thiourea produced defective edges containing C=O groups that preferred substituting the C-NHx groups over bulk g-C3N4.In the oxygen-free N2 atmosphere among the different calcination atmospheres,more C=O func-tional groups were generated on the defective edges of bulk g-C3N4,resulting in the highest N vacancy of the tri-s-triazine structure.During the successive chemical oxidation,S-or O-containing functional groups were introduced onto water-dispersible g-C3N4.The water-dispersible g-C3N4 photocatalyst from the oxygen-free N2 atmosphere(NTw)contained the most O-and S-functional groups on the g-C3N4 sur-face.Consequently,NTw exhibited the highest photocatalytic activity in the MB and TC-HCl photodegra-dation because of its slowest recombination process,which was ascribed to the unique surface properties of NTw such as abundant functional groups on the defective edges and N-deficient property.
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    Microstructures,mechanical properties and in vitro corrosion behavior of biodegradable Zn alloys microalloyed with Al,Mn,Cu,Ag and Li elements

    Lei LiHuanzheng JiaoCongfu LiuLin Yang...
    244-260页
    查看更多>>摘要：In this work,Zn microalloyed with Al,Mn,Cu,Ag and Li was cast,annealed and extruded.The results showed that addition of multiple trace elements causes significant change in the microstructures,me-chanical properties and corrosion behavior of Zn-0.1Al-0.1Mn-0.1Cu-0.1Ag(1ZM),Zn-0.1Al-0.1Mn-0.1Cu-0.1 Ag-0.1 Li(2ZM-0.1Li)and Zn-0.1Al-0.1Mn-0.1Cu-0.1Ag-0.35Li(3ZM-0.35Li)alloys.Two ternary phases with the approximate compositions of Al13Mn3Zn34 and Al10MnZn89 phases are formed in the casting and annealing processes of these alloys,respectively.Wavy β-LiZn4 lamellae that have not been extensively reported are precipitated from the primary Zn dendrites in the casting process of ZM-0.35Li alloy.Also,Zn laths are precipitated from the eutectic β-LiZn4 phase in the annealing process of ZM-0.35Li alloy.The above-mentioned phases are crushed or elongated in the as-extruded alloys,which play an important role in improving the strength of the alloys.All the as-extruded alloys have typical(0001)basal tex-ture,accompanied with relatively low{0001}<11(2)0>slip and high{10(1)2}<10(1)(1)>twinning Schmid factors,which are advantageous and disadvantageous to the strength enhancement of the alloys,respec-tively.All the as-cast alloys exhibit poor mechanical properties,especially low ductility.The as-extruded ZM alloy exhibits ultrahigh ductility,with an elongation of up to 82.2％±2.94％.The as-extruded ZM-0.35Li alloy shows the best comprehensive mechanical properties,with yield strength,ultimate tensile strength,elongation and hardness of 380±1.6 MPa,449±7.4 MPa,62.3％±4.63％and 98±1.4 HV,respectively.Electrochemical corrosion rates of the ZM,ZM-0.lLi and ZM-0.35Li alloys are 0.241±0.004,0.206±0.006 and 0.189±0.008 mm/year,respectively.In vitro immersion corrosion rates(after 26 d in SBF solution)of them are 0.134±0.005,0.125±0.004 and 0.121±0.003 mm/year,respectively.The as-extruded ZM-0.35Li alloy exhibits the best corrosion resistance.
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