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镁合金学报（英文）
镁合金学报（英文）

2213-9567

镁合金学报（英文）/Journal Journal of Magnesium and AlloysCSCD北大核心EISCI
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    Challenges and opportunities in the production of magnesium parts by directed energy deposition processes

    Gürel ?amAli Günen
    1830-1858页
    查看更多>>摘要：Mg-alloys have gained considerable attention in recent years for their outstanding properties such as lightweight,high specific strength,and corrosion resistance,making them attractive for applications in medical,aerospace,automotive,and other transport industries.However,their widespread application is hindered by their low formability at room temperature due to limited slip systems.Cast Mg-alloys have low mechani-cal properties due to the presence of casting defects such as porosity and anisotropy in addition to the high scrap.While casting methods benefit from established process optimization techniques for these problems,additive manufacturing methods are increasingly replacing casting methods in Mg alloys as they provide more precise control over the microstructure and allow specific grain orientations,potentially enabling easier opti-mization of anisotropy properties in certain applications.Although metal additive manufacturing(MAM)technology also results in some manufacturing defects such as inhomogeneous microstructural evolution and porosity and additively manufactured Mg alloy parts exhibit lower properties than the wrought parts,they in general exhibit supe-rior properties than the cast counterparts.Thus,MAM is a promising technique to produce Mg alloy parts.Directed energy deposition processes,particularly wire arc directed energy deposition(WA-DED),have emerged as an advantageous additive manufacturing(AM)technique for me-tallic materials including magnesium alloys,offering advantages such as high deposition rates,improved material efficiency,and reduced produc-tion costs compared to subtractive processes.However,the inherent challenges associated with magnesium,such as its high reactivity and sus-ceptibility to oxidation,pose unique hurdles in the application of this technology.This review paper delves into the progress made in the application of DED technology to Mg-alloys,its challenges,and prospects.Further-more,the predominant imperfections,notably inhomogeneous microstructure evolution and porosity,observed in Mg-alloy components manu-factured through DED are discussed.Additionally,the preventive measures implemented to counteract the formation of these defects are ex-plored.
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    Recent advancements in thermal conductivity of magnesium alloys

    Hao LvJun TanQian YuanFanglei Wang...
    1859-1882页
    查看更多>>摘要：As highly integrated circuits continue to advance,accompanied by a growing demand for energy efficiency and weight reduction,materials are confronted with mounting challenges pertaining to thermal conductivity and lightweight properties.By virtue of numerous intrinsic mecha-nisms,as a result,the thermal conductivity and mechanical properties of the Mg alloys are often inversely related,which becomes a bottle-neck limiting the application of Mg alloys.Based on several effective modification methods to improve the thermal conductivity of Mg alloys,this pa-per describes the law of how they affect the mechanical properties,and clearly indicates that peak aging treatment is one of the best ways to sim-ultaneously enhance an alloy's thermal conductivity and mechanical properties.As the most frequently used Mg alloy,cast alloys exhibit sub-stantial potential for achieving high thermal conductivity.Moreover,recent reports indicate that hot deformation can significantly improve the mechanical properties while maintaining,and potentially slightly enhancing,the alloy's thermal conductivity.This presents a meaningful way to develop Mg alloys for applications in the field of small-volume heat dissipation components that require high strength.This comprehensive re-view begins by outlining standard testing and prediction methods,followed by the theoretical models used to predict thermal conductivity,and then explores the primary influencing factors affecting thermal conductivity.The review summarizes the current development status of Mg al-loys,focusing on the quest for alloys that offer both high thermal conductivity and high strength.It concludes by providing insights into forth-coming prospects and challenges within this field.
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    Magnesium oxide(MgO)nanoadsorbents in wastewater treatment:A comprehensive review

    H.C.S.PereraV.GurunanthananAnoop SinghM.M.M.G.P.G.Mantilaka...
    1883-1955页
    查看更多>>摘要：Wastewater contamination by heavy metals and synthetic dyes presents a significant environmental challenge,necessitating effective and sus-tainable separation techniques.This review article provides a detailed examination of magnesium oxide(MgO)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with a specific focus on heavy metal and dye removal.The review comprehensively explores various aspects of MgO nanoparticles,including their structural characteristics and synthesis techniques.The article delves into the morphology and crystallographic arrangement of MgO nanoparticles,offering insights into their structural attributes.Given the complexity of adsorption proces-ses,the review identifies and analyzes parameters influencing the adsorption efficiency of MgO nanoparticles,such as temperature,pH,contact time,initial concentration,and co-existing ions.The interplay between these parameters and the adsorption capability of MgO nanoparticles em-phasizes the importance of optimizing operational conditions.Furthermore,the review assesses various synthesis methods for MgO nanoparti-cles,including sol-gel,hydrothermal,precipitation,green synthesis,solvothermal,and template-assisted techniques.It discusses the advantages,limitations,and resulting nanoparticle characteristics of each method,enabling readers to grasp the implications of synthesis processes on adsorp-tion efficiency.This comprehensive review consolidates current insights into the effectiveness of MgO nanoparticles as a potent nanoadsorbent for removing heavy metals and dyes from wastewater covering a wide spectrum of aspects related to MgO nanoparticles.Moreover,there is a need to investigate the use of MgO in the treatment of actual wastewater or river water,in order to leverage its cost-effectiveness and high effi-ciency for practical water treatment applications in real-time.
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    Towards designing high mechanical performance low-alloyed wrought magnesium alloys via grain boundary segregation strategy:A review

    Zhi ZhangJinshu XieJinghuai ZhangXuSheng Yang...
    1956-1975页
    查看更多>>摘要：Low-alloyed magnesium(Mg)alloys have emerged as one of the most promising candidates for lightweight materials.However,their further application potential has been hampered by limitations such as low strength,poor plasticity at room temperature,and unsatisfactory formability.To address these challenges,grain refinement and grain structure control have been identified as crucial factors to achieving high performance in low-alloyed Mg alloys.An effective way for regulating grain structure is through grain boundary(GB)segregation.This review presents a com-prehensive summary of the distribution criteria of segregated atoms and the effects of solute segregation on grain size and growth in Mg alloys.The analysis encompasses both single element segregation and multi-element co-segregation behavior,considering coherent interfaces and inco-herent interfaces.Furthermore,we introduce the high mechanical performance low-alloyed wrought Mg alloys that utilize GB segregation and analyze the potential impact mechanisms through which GB segregation influences materials properties.Drawing upon these studies,we propose strategies for the design of high mechanical performance Mg alloys with desirable properties,including high strength,excellent ductility,and good formability,achieved through the implementation of GB segregation.The findings of this review contribute to advancing the understanding of grain boundary engineering in Mg alloys and provide valuable insights for future alloy design and optimization.
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    Accelerated intermetallic phase amorphization in a Mg-based high-entropy alloy powder

    Prince SharmaPurvam Mehulkumar GandhiKerri-Lee ChintersinghMirko Schoenitz...
    1976-1983页
    查看更多>>摘要：We describe a novel mechanism for the synthesis of a stable high-entropy alloy powder from an otherwise immiscible Mg-Ti rich metallic mixture by employing high-energy mechanical milling.The presented methodology expedites the synthesis of amorphous alloy powder by stra-tegically injecting entropic disorder through the inclusion of multi-principal elements in the alloy composition.Predictions from first principles and materials theory corroborate the results from microscopic characterizations that reveal a transition of the amorphous phase from a precursor intermetallic structure.This transformation,characterized by the emergence of antisite disorder,lattice expansion,and the presence of nanograin boundaries,signifies a departure from the precursor intermetallic structure.Additionally,this phase transformation is accelerated by the presence of multiple principal elements that induce severe lattice distortion and a higher configurational entropy.The atomic size mismatch of the dissimi-lar elements present in the alloy produces a stable amorphous phase that resists reverting to an ordered lattice even on annealing.
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    Microstructure and impact behavior of Mg-4Al-5RE-xGd cast magnesium alloys

    Jie WeiQudong WangHuisheng CaiMahmoud Ebrahimi...
    1984-2000页
    查看更多>>摘要：This work investigated the microstructure and impact behavior of Mg-4Al-5RE-xGd(RE represents La-Ce mischmetal;x=0％,0.2％,0.7％in mass fraction)alloys cast by high-pressure die casting(HPDC),permanent mold casting(PMC),and sand casting(SC)techniques.The results indicated that with increasing Gd content,the grain sizes of the HPDC alloy had a slight change,but the grains of the PMC and SC alloys were significantly refined.Besides,the a cicular Al11RE3 phase was modified into the short-rod shape under the three casting conditions.The impact toughness of the studied alloy was mainly dominated by the absorbed energy during the crack initiation.With increasing Gd content,the impact toughness of the studied alloy monotonically increased due to the lower tendency of the modified second phase toward crack initiation.The im-pact stress was higher than the tensile stress,exhibiting a strain rate sensitivity for the mechanical response;however,the HPDC alloy had an in-consistent strain rate sensitivity during the impact event due to the transformation of the deformation mechanism from twinning to slip with in-creasing strain.Abundant dimples covered the fracture surface of the fine-grained HPDC alloys,indicating a typical ductile fracture.Neverthe-less,due to the deficient {10T2} twinning activity and the suppressed grain boundary sliding during the impact event,the HPDC alloys showed insufficient plastic deformation capacity.
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    Quantification of grain boundary effects on the geometrically necessary dislocation density evolution and strain hardening of polycrystalline Mg-4Al using in situ tensile testing in scanning electron microscope and HR-EBSD

    Eunji SongMohsen Taheri AndaniAmit Misra
    2001-2016页
    查看更多>>摘要：In situ tensile testing in a scanning electron microscope(SEM)in conjunction with high-resolution electron backscatter diffraction(HR-EBSD)under load was used to characterize the evolution of geometrically necessary dislocation(GND)densities at individual grain boundaries as a function of applied strain in a polycrystalline Mg-4A1 alloy.The increase in GND density was investigated at plastic strains of 0％,0.6％,2.2％,3.3％from the area including 76 grains and correlated with(ⅰ)geometric compatibility between slip systems across grain boundaries,and(ⅱ)plastic incompatibility.We develop expressions for the grain boundary GND density evolution as a function of plastic strain and plastic in-compatibility,from which uniaxial tensile stress-strain response of polycrystalline Mg-4A1 are computed and compared with experimental meas-urement.The findings in this study contribute to understanding the mechanisms governing the strain hardening response of single-phase poly-crystalline alloys and more reliable prediction of mechanical behaviors in diverse microstructures.
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    Re-delocalization of localized d-electrons in VO2(R)-VS4 hetero-structure enables high performance of rechargeable Mg-ion batteries

    Lijiao ZhouChao ShenXueyang HouZhao Fang...
    2017-2027页
    查看更多>>摘要：Rechargeable Mg-ion batteries(MIBs)have attracted much more attentions by virtue of the high capacity from the two electrons chemistry.However,the reversible Mg2+diffusion in cathode materials is restricted by the strong interactions between the high-polarized bivalent Mg2+ions and anionic lattice.Herein,we design and propose a hetero-structural VO2(R)-VS4 cathode,in which the re-delocalized d-electrons can effective-ly shield the polarity of Mg2+ions.Theoretically,the electrons should spontaneously transfer from VS4 to VO2(R)through the interfaces of het-ero-structure due to the lower work function value of VS4.Furthermore,the internal electrons transfer lead to the electronic injection into VO2(R)from VS4 and the partially broken V-V dimers,indicating the presence of lone pair electrons and charge re-delocalization.Benefiting from the shield effect of re-delocalized electrons,and the weakened attraction between cations and O/S anions enables more S2--S22-redox groups to participate the electrochemical reactions and compensate the double charge of Mg2+ions.Accordingly,VO2(R)-VS4 hetero-structure exhibits a high specific capacity of 554 mA·h·g-1 at 50 mA·g-1.It is believed that the charge re-delocalization of cathode extremely boost the Mg2+ions migration for the high-capacity of MIBs.
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    In situ TEM investigation of electron irradiation and aging-induced high-density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr alloy

    M.LvH.L.GeQ.Q.JinX.H.Shao...
    2028-2040页
    查看更多>>摘要：In-situ electron irradiation and aging are applied to introduce high-density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,mass fraction)alloy to improve the hardness.The results show that the hardness of the Mg alloy after irradiation for 10 h and aging for 9 h at 250 ℃is 1.64 GPa,which is approximately 64％higher than that of the samples before being treated.It is mainly attributed to y'precipitates on the basal plane after irradiation and the high-density nanoscale β'precipitates on the prismatic plane after aging,which should be closely related to the irradiation-induced homogenous clusters.The latter plays a key role in precipitation hardening.This result paves a way to improve the me-chanical properties of metallic materials by tailoring the precipitation through irradiation and aging.
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    A combined computational/experimental study of anode-concerned voltage drop in aqueous primary Mg-air batteries

    Wen XuMin DengDarya SnihirovaLinqian Wang...
    2041-2053页
    查看更多>>摘要：The voltage drop appearing at Mg anode-electrolyte interface is a critical issue for the battery power and energy density of aqueous primary Mg-air batteries.The respective voltage loss is typically assigned to the deposits layer forming on the anode surface during discharge.In this work,we experimentally and computationally investigate the critical factors affecting the voltage drop at Mg anode towards a deeper under-standing of the contribution of deposit and its growth.A two-dimensional(2D)mathematical model is proposed to compute the voltage drop of Mg-0.15％Ca(mass fraction)alloy(Mg-0.15Ca)by means of a semi-empirical formulas and experiments-based modification model,considering the effect of discharge current density,the negative difference effect(NDE)and surface deposits layer itself.This model is utilized to simulate the discharge potential of the anode at predefined experimental current densities.The computed voltage drop(half-cell voltage)is in good agree-ment with the experimental value.The applicability of the mathematical model is successfully validated on the second material(namely high-pu-rity Mg).
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