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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
正式出版
收录年代

    Advancing sustainability:Magnesium-based solutions for environmental challenges and high-performance technologies in superconductivity

    Muralidhar Miryala
    1390-1393页
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    Biomedical rare-earth magnesium alloy:Current status and future prospects

    Mingli YangCheng ChenDongsheng WangYinjin Shao...
    1394-1420页
    查看更多>>摘要：Biomedical magnesium(Mg)alloys have garnered significant attention because of their unique biodegradability,favorable biocompatibility,and suitable mechanical properties.The incorporation of rare earth(RE)elements,with their distinct physical and chemical properties,has great-ly contributed to enhancing the mechanical performance,degradation behavior,and biological performance of biomedical Mg alloys.Currently,a series of RE-Mg alloys are being designed and investigated for orthopedic implants and cardiovascular stents,achieving substantial and en-couraging research progress.In this work,a comprehensive summary of the state-of-the-art in biomedical RE-Mg alloys is provided.The physi-ological effects and design standards of RE elements in biomedical Mg alloys are discussed.Particularly,the degradation behavior and mechani-cal properties,including their underlying action are studied in-depth.Furthermore,the preparation techniques and current application status of RE-Mg alloys are reviewed.Finally,we address the ongoing challenges and propose future prospects to guide the development of high-perform-ance biomedical Mg-RE alloys.
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    Post processing of additive manufactured Mg alloys:Current status,challenges,and opportunities

    Nooruddin AnsariFatima Ghassan AlabtahMohammad I.AlbakriMarwan Khraisheh...
    1421-1450页
    查看更多>>摘要：Magnesium(Mg)and its alloys are emerging as a structural material for the aerospace,automobile,and electronics industries,driven by the imperative of weight reduction.They are also drawing notable attention in the medical industries owing to their biodegradability and a lower e-lastic modulus comparable to bone.The ability to manufacture near-net shape products featuring intricate geometries has sparked huge interest in additive manufacturing(AM)of Mg alloys,reflecting a transformation in the manufacturing sectors.However,AM of Mg alloys presents more formidable challenges due to inherent properties,particularly susceptibility to oxidation,gas trapping,high thermal expansion coefficient,and low solidification temperature.This leads to defects such as porosity,lack of fusion,cracking,delamination,residual stresses,and inhomogeneity,ultimately influencing the mechanical,corrosion,and surface properties of AM Mg alloys.To address these issues,post-processing of AM Mg alloys are often needed to make them suitable for application.The present article reviews all post-processing techniques adapted for AM Mg al-loys to date,including heat treatment,hot isostatic pressing,friction stir processing,and surface peening.The utilization of these methods within the hybrid AM process,employing interlayer post-processing,is also discussed.Optimal post-processing conditions are reported,and their influ-ence on the microstructure,mechanical,and corrosion properties are detailed.Additionally,future prospects and research directions are proposed.
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    Comprehensive insights into recent innovations:Magnesium-inclusive high-entropy alloys

    Andrii BabenkoEhsan GhasaliSaleem RazaKahila Baghchesaraee...
    1451-1486页
    查看更多>>摘要：This review focuses on thermodynamic and physical parameters,synthesis methods,and reported phases of magnesium(Mg)containing high-entropy alloys(HEAs).Statistical data of publications concerning Mg-containing HEAs were collected and analyzed.Data on the chemical ele-ments included in Mg-containing HEAs,their theoretical end experimental densities,thermodynamic parameters,physical parameters,fabricated techniques and reported phases were also collected and discussed.On the basis of this information,a new classification for HEAs was proposed.It is also shown that the existing thermodynamic parameters cannot accurately predict the formation of a single phase solid solution for Mg-con-taining HEAs.The physical parameters of Mg-containing HEAs are within a wide range,and most of the synthesized Mg-containing HEAs have a complex multiphase structure.
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    Interplay of laser power and pore characteristics in selective laser melting of ZK60 magnesium alloys:A study based on in-situ monitoring and image analysis

    Weijie XieHau-Chung ManChi-Wai Chan
    1487-1508页
    查看更多>>摘要：This study offers significant insights into the multi-physics phenomena of the SLM process and the subsequent porosity characteristics of ZK60 Magnesium(Mg)alloys.High-speed in-situ monitoring was employed to visualise process signals in real-time,elucidating the dynamics of melt pools and vapour plumes under varying laser power conditions specifically between 40 W and 60 W.Detailed morphological analysis was performed using scanning-electron microscopy(SEM),demonstrating a critical correlation between laser power and pore formation.Lower laser power led to increased pore coverage,whereas a denser structure was observed at higher laser power.This laser power influence on porosi-ty was further confirmed via optical microscopy(OM)conducted on both top and cross-sectional surfaces of the samples.An increase in laser power resulted in a decrease in pore coverage and pore size,potentially leading to a denser printed part of Mg alloy.X-ray computed tomo-graphy(XCT)augmented these findings by providing a 3D volumetric representation of the sample internal structure,revealing an inverse rela-tionship between laser power and overall pore volume.Lower laser power appeared to favour the formation of interconnected pores,while a re-duction in interconnected pores and an increase in isolated pores were observed at higher power.The interplay between melt pool size,vapour plume effects,and laser power was found to significantly influence the resulting porosity,indicating a need for effective management of these factors to optimise the SLM process of Mg alloys.
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    Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

    Bangzhao YinJinge LiuBo PengMengran Zhou...
    1509-1528页
    查看更多>>摘要：Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical parts.Layer thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg alloys.In this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40 pm were fabricated.The required laser energy input in-creased with increasing layer thickness and was different for the bulk cubes and porous scaffolds.Porosity tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy input.For thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geomet-rical structure,and laser energy input on the porosity.All the samples achieved a high fusion quality with a relative density of over 99.5％using the optimized laser energy input.The increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain tex-ture.With the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41％with the 10 pm layer to 287 MPa and 15.12％with the 40 μm layer,in accordance with the microstructural change.The effect of layer thickness on the compressive properties of porous scaffolds was limited.However,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.
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    Effect of low concentration electrolytes on the formation and corrosion resistance of PEO coatings on AM50 magnesium alloy

    Peng XieCarsten BlawertMaria SerdechnovaNatalia Konchakova...
    1529-1551页
    查看更多>>摘要：In this paper,the formation process,morphology,and electrochemical performance of PEO coatings on AM50 magnesium alloy prepared in low concentration phosphate,aluminate,and phosphate-aluminate electrolytes were systematically studied.The results show that the coatings prepared from the phosphate electrolytes have a higher thickness and better corrosion resistance properties compared to the other electrolytes.The coatings prepared from low concentration phosphate-aluminate mixed electrolytes have slightly thinner thickness,a similar coating structure and an order of magnitude lower value of electrochemical impedance compared with phosphate electrolyte coatings.The coatings prepared from low concentration aluminate electrolytes have the lowest thickness and the worst corrosion resistance properties which gets close to corrosion be-havior of the bare AM50 under the same test conditions.Considering application,coatings prepared from single low concentration phosphate e-lectrolytes and low concentration phosphate-aluminate electrolytes have greater potential than single low concentration aluminate coatings.How-ever,reducing the electrolyte concentrations of coating forming ions too much has negative influence on the coating growth rate.
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    High-throughput calculations combining machine learning to investigate the corrosion properties of binary Mg alloys

    Yaowei WangTian XieQingli TangMingxu Wang...
    1552-1566页
    查看更多>>摘要：Magnesium(Mg)alloys have shown great prospects as both structural and biomedical materials,while poor corrosion resistance limits their further application.In this work,to avoid the time-consuming and laborious experiment trial,a high-throughput computational strategy based on first-principles calculations is designed for screening corrosion-resistant binary Mg alloy with intermetallics,from both the thermodynamic and kinetic perspectives.The stable binary Mg intermetallics with low equilibrium potential difference with respect to the Mg matrix are firstly iden-tified.Then,the hydrogen adsorption energies on the surfaces of these Mg intermetallics are calculated,and the corrosion exchange current den-sity is further calculated by a hydrogen evolution reaction(HER)kinetic model.Several intermetallics,e.g.Y3Mg,Y2Mg and La5Mg,are identi-fied to be promising intermetallics which might effectively hinder the cathodic HER.Furthermore,machine learning(ML)models are developed to predict Mg intermetallics with proper hydrogen adsorption energy employing work function(Wf)and weighted first ionization energy(WFIE).The generalization of the ML models is tested on five new binary Mg intermetallics with the average root mean square error(RMSE)of 0.11 eV.This study not only predicts some promising binary Mg intermetallics which may suppress the galvanic corrosion,but also provides a high-throughput screening strategy and ML models for the design of corrosion-resistant alloy,which can be extended to ternary Mg alloys or other alloy systems.
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    An in-situ study of static recrystallization in Mg using high temperature EBSD

    Xu YeZhe SuoZhonghao HengBiao Chen...
    1567-1580页
    查看更多>>摘要：It has been a common method to improve the mechanical properties of metals by manipulating their microstructures via static recrystallization,i.e.,through heat treatment.Therefore,the knowledge of recrystallization and grain growth is critical to the success of the technique.In the pres-ent work,by using in-situ high temperature EBSD,the mechanisms that control recrystallization and grain growth of an extruded pure Mg were studied.The experimental results revealed that the grains of priority for dynamic recrystallization exhibit fading competitiveness under static re-crystallization.It is also found that grain boundary movement or grain growth is likely to show an inverse energy gradient effect,i.e.,low ener-gy grains tend to swallow or grow into high energy grains,and grain boundaries of close to 30° exhibit superior growth advantage to others.Another finding is that {10-12} tensile twin boundaries are sites of hardly observed for recrystallization,and are finally swallowed by adjacent recrystallized grains.The above findings may give comprehensive insights of static recrystallization and grain growth of Mg,and may guide the design of advanced materials processing in microstructural engineering.
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    Optimization of chemistry and process parameters for control of intermetallic formation in Mg sludges

    Y.FuG.G.WangA.HuY.Li...
    1581-1598页
    查看更多>>摘要：Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very important issue.But,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die casters.The aim of this study was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry and process parameters.The Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn ratio.The design of experiment(DOE)technique,Taguchi method,was employed to minimize the intermetallic formation in the sludge of Mg alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding time.The sludge yield(SY)and intermetallic size(IS)was selected as two responses.The optimum combination of the levels in terms of minimizing the intermetallic formation were 9％Al,0.15％Mn,0.001％(10-5)Fe(mass fraction),690 ℃ for the holding temperature and holding at 30 mins for the holding time,respectively.The best combination for smallest intermetallic size were 9％Al,0.15％Mn,0.001％(10-5)Fe(mass fraction),630 ℃ for the holding temperature and holding at 60 mins for the holding time,respectively.Three groups of sludge factors,chemical sludge(CSF),physical sludge(PSF)and comprehensive sludge fac-tors(and CPSF)were established for prediction of sludge yields and intermetallic sizes in Al-containing Mg alloys.The CPSF with five inde-pendent variables including both chemical elements and process parameters gave high accuracy in prediction,as the prediction of the PSF with only the two processing parameters of the melt holding temperature and time showed a relatively large deviation from the experimental data.The chemical sludge factor was primarily designed for small ingot producers and die casters with a limited melting and holding capacity,of which process parameters could be fixed easily.The Physical sludge factor could be used for mass production with a single type of Mg alloy,in which the chemistry fluctuation might be negligible.In large Mg casting suppliers with multiple melting and holding furnaces and a number of Mg al-loys in production,the comprehensive sludge factor should be implemented to diminish the sludge formation.
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