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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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    Microstructure and mechanical properties of cast Al-Li-Mg alloy:Role of Cu addition and heat treatment

    Fangzhou QiGuohua WuLiang ZhangXin Tong...
    1-16页
    查看更多>>摘要：In this work,the effect of Cu addition and heat treatment schemes on the microstructural evolution,mechanical properties,and corresponding strengthening mechanism of cast Al-Li-Mg alloy were investi-gated.Results indicate that the dendritic segregation would be induced after the introduction of Cu,and a well-designed two-stage solution treatment could effectively dissolve secondary phases.With Cu addi-tion,aging hardening responses of the alloys were accelerated,accompanied by a continuous increase in the volume fraction of both S'-Al2CuMg and Al3Li phases,which enhanced the precipitation strengthen-ing effect.Furthermore,in Cu-containing alloys,both the coarsening of Al3Li phases and the expansion of Al3Li-precipitation free zones(PFZ)were inhibited during the aging process.However,severe strain accumulation was found at the interface between the coalesced S'phase and α-Al matrix,which reduced the ductility of the alloy.A good combination of strength and ductility(YS=308 MPa,UTS=428 MPa,EL=5.0％)was obtained in the Al-2.5Li-2Mg-1Cu-0.12Zr alloy aged at 175 ℃ for 32 h due to the nar-rowed Al3Li-PFZ and the synergistic strengthening of Al3 Li and S'phase.This work is expected to provide guidelines for designing novel cast Al-Li alloys with wider applications.
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    Optimized synthesis of Fe-doped Ohmic Schottky heterojunctions for efficient NO3-photocatalytic reduction to generate N2

    Ziqun WangHengtong XiaZhihao ChenWenzhong Yang...
    17-26页
    查看更多>>摘要：Capacitive Fe-doped Ni2P(Fe2xNi2(1-x)P)is synthesized via the modified solvothermal method to form Ohmic Schottky heterojunctions with monolayer Ti3C2(MLTC).The composite(10％0.1FNP/CdS-2％MLTC)achieved a high hydrogen evolution rate(HER)of 19.18 mmol h-1 with a 50 mg sample.In a mere span of 3 h,an impressive NO3-reduction of 0.42 mg/L was achieved,accompanied by an excep-tional 92％N2 selectivity.Quantum efficiency(QE)can reach 56.22％(λ=475 nm)by adding 0.1 FNP and MLTC.In contrast to previous catalysts,the QE of visible light after 500 nm has been improved to 45.2％(λ=500 nm)or 36.4％(λ=550 nm).The significant enhancement of HER and NO3-reduction is attributed to the enhanced adsorption of oxygen-containing reactants,the lowering of the reduction over-potential,further enhanced separation efficiency of photogenerated carriers through the ohmic Schottky heterojunction after iron doping.Additionally,the observed capacitor-like nature of 0.1 FNP is also an es-sential factor for the enhanced reduction ability of the composites.
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    High-strength extruded magnesium alloys:A critical review

    H.WangX.C.LuoD.T.ZhangC.Qiu...
    27-52页
    查看更多>>摘要：Magnesium(Mg)has great potential for application in the automotive and aerospace sectors due to its abundant resources and low density.However,the industrial applications of Mg alloys are far below alu-minum alloys.At present,most commercial Mg alloys exhibit a low yield strength of＜300 MPa,and their specific strength does not exhibit an advantage over that of aluminum alloys and high-strength steels.Improving the strength of Mg alloys is one of the key topics in this field.In the past two decades,high-strength Mg alloys made by powder metallurgy and severe plastic deformation techniques have been reported,but the small sample dimension and high-cost limit their industrial production.Extru-sion can be used to fabricate bulk materials with fine-grained microstructures and improved mechanical properties,which is considered as a suitable route of producing high-strength Mg alloys at the indus-trial level.In this review,recent advances in the extrusion of different Mg alloys are briefly summa-rized,including commercial Mg alloys,high-alloyed Mg-RE alloys,and Ca-containing Mg alloys.Different strengthening strategies,including alloying,grain refinement,texture modification,etc.,are employed in developing high-strength Mg alloys,with special attention to a novel strengthening mechanism,namely hetero-deformation-induced strengthening,which has recently been applied to simultaneously improve the strength and ductility of Mg alloys.Therefore,the heterostructured Mg alloys prepared by extrusion are also introduced in this work,and the influences of alloying elements and extrusion parameters on the preparation of heterostructured Mg alloys are discussed systematically.Furthermore,this review summa-rizes the effect of post-extrusion treatment on the mechanical properties of extruded Mg alloys,along with a brief comparison of the mechanical properties between Mg and Al alloys.Finally,some poten-tial research directions for further advancing the high-performance and low-cost extruded Mg alloys are suggested.
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    Pauling-type adsorption of O2 induced by S-scheme electric field for boosted photocatalytic H2O2 production

    Shuang ZhouDa WenWei ZhongJianjun Zhang...
    53-65页
    查看更多>>摘要：The effective adsorption of oxygen(O2)molecules over photocatalysts is a critical step in promoting the performance of photocatalytic H2O2 production.However,g-C3N4 usually features a Yeager-type(side-on)adsorption configuration of O2 molecules,which causes the breaking of O-O bonds and severely hinders the H2O2 production activity.Herein,we synthesized an oxygen-vacancy-rich TiO2-x/g-C3N4 step-scheme(S-scheme)heterojunction to regulate the oxygen adsorption configuration and improve the 2e-ORR se-lectivity of H2O2 production.In-situ X-ray photoelectron spectroscopy(in-situ XPS)and density functional theory(DFT)calculations reveal that the S-scheme heterojunction is formed between TiO2-x and g-C3N4.The difference between their Fermi levels leads to the electron flow from g-C3N4 to TiO2-x,which in-creases the electron-deficient sites in g-C3N4.As a result,the cleavage of O-O bonds on the surface of g-C3N4 is avoided and the oxygen adsorption configuration is tuned from Yeager-type to Pauling-type(end-on).Consequently,the photocatalytic H2O2 production rate is dramatically improved to 1780.3 μmol h-1,which is about 5 times higher than that of pristine g-C3N4.This work paves a new way to tailor the oxygen adsorption configuration by rationally designing S-scheme heterojunction photocatalysts.
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    Modulating Fe/P ratios in Fe-P alloy through smelting reduction for long-term electrocatalytic overall water splitting

    Tian ZhangXiaohui RenShuai MoWenzhe Cao...
    66-74页
    查看更多>>摘要：Owing to strong Fe-P interaction that differs the electron distribution beneath metal/phosphide interface of Fe-P alloy,the charge transfer of Fe-P alloy has been accelerated during the electrocatalytic oxidation process and improved the efficiency and durability of overall water splitting.In this work,a novel metal-lurgical technology in combination with smelting reduction and Single Roller Melting Spinning(SRMS)for the purpose of electrochemical overall water splitting where High-phosphorus Oolitic Iron Ore(HPOIO)has been directly used as the main raw material is developed for preparing amorphous Fe-P alloys strips.The rational modulation on the Fe/P ratio can alter the crystal structure and crystallinity of Fe-P alloy,favor electron transfer,and further trap the positively charged H+.The obtained FeP electrocatalyst ex-hibits 436 and 527 mV at 10 mA cm-1 with Tafel slopes of 102.3 and 77.2 mV dec-1 for HER and OER in 1.0 mol/L KOH solution,respectively,especially with long-term stability(～207 h for HER and～42 h for OER).Specifically,the DFT calculation displaying structural advantages and componential superiorities exhibited that P in Fe-P amorphous alloy regulated by systematic P addition optimization might increase the energy density in the Fermi level.Furthermore,the phosphorus content brought about high active surface areas,low impedance,and variable reaction paths-caused low reaction energy barriers with the improved amorphicity and absorption and desorption of intermediates,thereby boosting the overall wa-ter splitting activity.This study displays a novel strategy to develop Fe-P amorphous alloy for the stable and efficient overall water splitting.
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    Cr dopants and S vacancies in ZnS to trigger efficient photocatalytic H2 evolution and CO2 reduction

    Linping BaoYushuai JiaXiaohui RenXin Liu...
    75-85页
    查看更多>>摘要：Driven by endless solar energy,photocatalytic H2 evolution from water splitting and CO2 conversion to hydrocarbon fuels over semiconductor photocatalysts are of great potential to simultaneously settle the greenhouse effect and energy shortage.Herein,Cr-doped zinc sulfide(ZnS)with accompanying sulphur vacancies(Vs)photocatalytic materials is developed by a facile hydrothermal method.The Cr dopants centralize photoinduced holes and Vs trap electrons,forming a synergistic effect for accelerating charge separation and transfer.The reaction energy barrier for both H2 evolution and CO2 reduction has been optimized.Therefore,in the absence of a cocatalyst,the optimal catalyst(Zn0.94Cr0.06S)achieves an out-standing H2 evolution activity of 20.3 mmol g-1 h-1,which is approximately 2.9 times higher than 6.9 mmol g-1 h-1 for pristine ZnS.In addition,in the gas-solid reaction system without co-catalysts or sacrificial agents,the Zn0.94Cr0.06S exhibits a considerable CO evolution rate of 19.56 μmol g-1 h-1,about 10.1 times higher than ZnS(1.94 μmol g-1 h-1).Both the performances for H2 evolution and CO2 reduction of Zn0.94Cr0.06S outperform most of the previously reported photocatalysts.Particularly,the Zn0.94Cr0.06S possesses superior stability,the photoactivity of which exhibits no noticeable deactiva-tion after six cycles'reactions.This work may shed light on the rational design and fabrication of highly efficient materials via combining individual element doping and defect engineering.
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    Enhanced strength and ductility of laser-directed energy deposition repaired IN718 superalloy via a novel tailored heat treatment

    You ZhouXuewei FangNaiyuan XiXiaoxin Jin...
    86-101页
    查看更多>>摘要：High-quality repair of damaged Inconel 718(IN718)superalloy components can achieve great economic benefits.However,the directly double aging(DA)treatment by industrial standards,yields an inferior ductility on the repaired component than that of the wrought base metal.In this work,wrought IN718 components were repaired by laser-directed energy deposition(LDED),a novel tailored heat treatment(THT)schedule consisting of a short-term low-temperature homogenization,and subsequent DA was sub-sequently conducted to strengthen the repaired IN718 alloys.The microstructure evolution and mechan-ical properties of the DA and THT-treated repaired alloys were comparatively investigated.The results indicated that the THT effectively dissolved most of the hard brittle Laves precipitates in the deposition region with only slight coarsening of the grains in the substrate.As compared to the DA sample,the elon-gation of the THT sample increased remarkably by 88％with only a slight reduction of 19.2 MPa in yield stress.Moreover,the strain distribution of the THT sample was overall more even but then destabilized in a narrow abnormal coarsened grain region caused by the static recrystallization.In general,this study breaks through the limitation of the low ductility of the DA-treated repaired IN718 alloys and provides a promising way to further improve the mechanical properties.
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    High-pressure-torsion-induced segregation,precipitation and grain refinement of Al-(Si,Mg and Cu)binary alloys

    Man FengQinli WuJing XueZhenjiao Luo...
    102-113页
    查看更多>>摘要：To uncover the effects of segregation and precipitation on grain refinement of metals under severe plastic deformation,high-pressure-torsion(HPT)processing is performed on three binary Al-(Si,Mg,and Cu)alloys with different stability and segregation characteristics.Atom probe tomography analysis reveals that HPT processing induces significant decomposition of Al-1 at％Si and Al-1 at％Cu alloys with coarse Si particles and fine Al2Cu(θ)precipitates formed,but no decomposition of Al-1 at％Mg alloy,with dislocations segregated with Si,Cu,and Mg,and grain boundaries(GBs)only segregated with Cu and Mg.The GB segregation of Cu is stronger than that of Mg and Si,with Cu excess in the range of 1.5-7.0 atoms/nm2,Mg excess in the range of 0-4.0 atoms/nm2,but no Si excess.Interestingly,some GBs without Mg segregation develop a Mg-depletion zone along a single side,All evidences demonstrate that GB segregation and precipitation are responsible for HPT-induced grain refinement of Al-1Mg and Al-1Cu alloys but coarsening of the Al-1Si alloy.Engineering solute distribution is of significance in controlling the ultrafine grain of the Al alloys.
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    Enhanced grain orientation degree and electrical properties in PSN-PMN-PT textured ceramics under the effect of sintering aids

    Ruigang QiuFeifei GuoJie WuWenqiang Bai...
    114-124页
    查看更多>>摘要：In this work,texturing is proposed to improve the piezoelectric response of PSN-PMN-PT ceramics.The PSN-PMN-PT textured ceramic with a Lotgering factor F001 higher than 99％was synthesized by the liquid-phase-assisted template grain growth(TGG)method.The addition of CuO/B2O3 sintering aids improves the BT templates induced grain orientation growth behavior significantly.In comparison with its random counterpart,the Cu/B-T textured ceramic exhibits a high Lotgering factor F001 of 99％and significantly enhanced dielectric and piezoelectric responses:εr～3100,tanδ～0.8％,d33～1030 pC N-1,d33·g33～34.2 × 10-12 m2 N-1,d33*～1490 pm V-1@5 kV cm-1,Smax～0.26％@20 kV cm-1 and Hs～8.5％.In the meantime,good temperature stability is observed in the Cu/B-T textured ceramic with a variation of d33*@20 kV cm-1 and annealed d33 lower than 9.68％and 18.1％over a wide temperature range of 25-140 ℃.This work shows that PSN-PMN-PT textured ceramic(Cu/B-T)has great potential for electrome-chanical device applications such as precision actuators,ultrasound transducers,and energy harvesters.
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    Towards the hydrogen pore in additively manufactured AlMgScZr alloy:Influencing factors,formation kinetics mechanism

    Rong XuRuidi LiTiechui YuanChengzhe Yu...
    125-144页
    查看更多>>摘要：Hydrogen pores in laser additive manufacturing(LAM)aluminum alloys have long been a major challenge for its application.In this study,the formation mechanisms of hydrogen pores and its kinetic behaviors were systematically investigated in laser directed energy deposited(L-DED)AlMgScZr alloy.The results indicated that hydrogen pores accumulated layer by layer at the melt pool boundaries,due to the high nucleation rate and insufficient time to escape of hydrogen pores at the melt pool boundaries.Dring the AlMgScZr powder at 150 ℃/4 h enabled the significant decrease of moisture content from 0.0520 wt％to 0.0096 wt％,while the porosity of the L-DED sample only decreased from 0.51％to 0.36％.The increase of laser power decreased the porosity of L-DED sample.Except the L-DED parameters,the alloy composition exerted a more significant influence on hydrogen porosity.When the Mg content increased from 9 wt％to 14 wt％,the porosity exhibited an increase from 0.36％to 0.52％.Conversely,the incorporation and subsequent augmentation of Si content resulted in a significant reduction in porosity,reaching as low as 0.15％with an increase to 2 wt％.The solubility and diffusion coefficient of[H]in Al-Mg-Sc-Zr melt with different Mg and Si contents were calculated by density functional theory(DFT).It was observed that increasing the Si content led to a decrease in the nucleation zone for hydrogen pores and reduced poros-ity.A comprehensive porosity inhibition strategy that combines powder drying,process optimization,and composition regulation have been developed.
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