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Effects of Gd solutes on hardness and yield strength of Mg alloys

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Progress in Natural Science:Materials International 2018年第6期28卷 724-730页

作者： Yuling Xu Felix Gensch Zhen Ren karl ulrich kainer Norbert Hort MagIC-Magnesium Innovation Center Helmholtz-Zentrum Geesthacht TU Berlin Forschungszentrum Strangpressen China North Material Science and Engineering Technology Group

Relative contribution of individual strengthening mechanisms to the yield strength of Mg–0–15 wt%Gd alloys were *** with different grain size were prepared by adding Zr and hot *** and tensile/compression yield strength were tested on the alloys after solid solution treatment and *** constants were calculated with hardness and tensile/compressive *** results showed that the hardness of Mg–Gd alloys with similar Gd content and different grain size were almost the same,which indicates that grain size had little effect on *** hardness linearly increased with rising Gd content(d Hv/dc≈25 kg mm-2/at%Gd).The tensile and compressive yield strengths enhanced with the increase of Gd content for all alloys in different *** addition,the tensile/compressive(t/c)yield asymmetry of extruded alloys decreased with increasing Gd *** t/c yield asymmetry ratio(1.77)was observed for pure Mg,and with increasing Gd content this value decreased to *** the increasing of tensile strength,the stress intensity factor,ky,decreased from 0.27 MPa m1/2for Mg–2 wt%Gd alloy to 0.19 MPa m1/2for Mg–5 wt%Gd alloy,then increased to 0.29 MPa m1/2for Mg–15 wt%Gd ***,kyincreased linearly form 0.16–0.31 MPa for compression *** influence of grain size strengthening was eliminated,and the yield strength of tension and compression both linearly increased with cn,where c is the atom concentration of Gd,and n=1/2 or 2/3.

关键词： Mg–Gd alloy Solid solution strengthening Hardness Yield strength

Influence of Ca addition on the dynamic and static recrystallization behavior of direct extruded flat profiles of Mg-Y-Zn alloy

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Journal of Magnesium and Alloys 2023年第10期11卷 3736-3748页

作者： Maria Nienaber Jan Bohlen Sangbong Yi Gerrit Kurz karl ulrich kainer Dietmar Letzig Institute of Material and Process Design Helmholtz-Zentrum Hereon GmbHMax-Planck-Str.1Geesthacht 21502Germany Agnes-Miegel Str.11Bad Essen 49152Germany

This paper investigates the influence of addition of Ca in a Y-Zn-containing magnesium alloy on the dynamic and static recrystallization behaviors and reveals the formation mechanism of the quadrupole texture during thermomechanical processing. Direct extrusion of flat bands has been conducted at various process conditions to study the difference between the two alloys WZ10 and WZX100 in terms of microstructure and texture development. It can be shown that, Ca addition promotes the DRX of WZ10 alloy. During additional heat treatment,the absence of Y segregation at the grain boundaries and the associated lack of solute drag to the boundary mobility leads to a pronounced grain growth during SRX in WZX100 alloy. Furthermore, it is shown that the addition of Ca to Y-Zn is not beneficial in terms of *** is demonstrated that alloying elements can have different effects depending on the recrystallization mechanisms. Partially recrystallized microstructure is a prerequisite at the as-extruded status to form the quadrupole texture and during subsequent annealing, which stands for high formability.

关键词： Extrusion Recrystallization Magnesium alloy Mg-Y-Zn-Ca alloy Formability quadrupole texture

Recent research and developments on wrought magnesium alloys

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Journal of Magnesium and Alloys 2017年第3期5卷 239-253页

作者： Sihang You Yuanding Huang karl ulrich kainer Norbert Hort MagIC-Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtMax-Planck-Str.1D-21502 GeesthachtFederal Republic of Germany

Wrought magnesium alloys attract special interests as lightweight structural material due to their homogeneous microstructure and enhanced mechanical properties compared to as-cast *** this contribution,recent research and developments on wrought magnesium alloys are reviewed from the viewpoint of the alloy design,focusing on Mg-Al,Mg-Zn and Mg-rare earth(RE)*** effects of different alloying elements on the microstructure and mechanical properties are described considering their strengthening mechanisms,*** refinement,precipitation and texture hardening ***,the new alloy design and also the future research of wrought magnesium alloys to improve their mechanical properties are discussed.

关键词： Wrought magnesium alloys Alloy design Mechanical properties

Understanding effects of microstructural inhomogeneity on creep response-New approaches to improve the creep resistance in magnesium alloys

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Journal of Magnesium and Alloys 2014年第2期2卷 124-132页

作者： Yuanding Huang Hajo Dieringa karl ulrich kainer Norbert Hort MagIC-Magnesium Innovation Center Helmholtz-Zentrum GeestachtMax-Planck-Strasse 1D-21502 GeesthachtGermany

Previous investigations indicate that the creep resistance of magnesium alloys is proportional to the stability of precipitated intermetallic phases at grain *** stable intermetallic phases were considered to be effective to suppress the deformation by grain boundary sliding,leading to the improvement of creep *** on this point,adding the alloying elements to form the stable intermetallics with high melting point became a popular way to develop the new creep resistant magnesium *** present investigation,however,shows that the creep properties of binary Mg-Sn alloy are still poor even though the addition of Sn possibly results in the precipitation of thermal stable Mg_(2)Sn at grain *** means other possible mechanisms function to affect the creep *** is finally found that the poor creep resistance is attributed to the segregation of Sn at dendritic and grain *** on this observation,new approaches to improve the creep resistance are suggested for magnesium alloys because most currently magnesium alloys have the commonality with the Mg-Sn alloys.

关键词： Magnesium alloy Creep resistance Microstructure High temperature deformation Mechanical properties

Development and prospects of degradable magnesium alloys for structural and functional applications in the fields of environment and energy

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Journal of Magnesium and Alloys 2023年第11期11卷 3926-3947页

作者： Yuanding Huang Yaping Zhang Jiangfeng Song Fusheng Pan Regine Willumeit-Römer karl ulrich kainer Norbert Hort Institute of Metallic Biomaterials Helmholtz-Zentrum hereonMax-Planck-Str.121502 GeesthachtGermany Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044PR China Chair of Light Elements Engineering Foundry and AutomationWrocław University of Science and Technology50-370 WrocławW.Wyspianskiego 27Poland Institute of Product&Process Innovation Leuphana University LüneburgUniversitätsallee 121335 LüneburgGermany

Magnesium and its alloys have such advantages with lightweight, high specific strength, good damping, high castability and machinability,which make them an attractive choice for applications where weight reduction is important, such as in the aerospace and automotive ***, their practical applications are still limited because of their poor corrosion resistance, low high temperature strength and ambient formability. Based on such their property shortcomings, recently degradable magnesium alloys were developed for broadening their potential applications. Considering the degradable Mg alloys for medical applications were well reviewed, the present review put an emphasis on such degradable magnesium alloys for structural and functional applications, especially the applications in the environmental and energy fields. Their applications as fracture ball in fossil energy, sacrificial anode, washing ball, and as battery anodes, transient electronics, were summarized. The roles of alloying elements in magnesium and the design concept of such degradable magnesium alloys were discussed. The existing challenges for extending their future applications are explored.

关键词： Magnesium alloys Alloying Structural applications Degradation Mechanical property Corrosion property Fossil and hydrogen energy Fracture ball Battery anode Transient electronics Hydrogen energy

Unexpected formation of hydrides in heavy rare earth containing magnesium alloys

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Journal of Magnesium and Alloys 2016年第3期4卷 173-180页

作者： Yuanding Huang Lei Yang Sihang You Weimin Gan karl ulrich kainer Norbert Hort Institute of Materials Research Helmholtz-Zentrum GeesthachtZentrum für Material-und KüstenforschungMax-Planck-Str.121502 GeesthachtGermany Key Laboratory for Anisotropy and Texture of Materials Education Ministry of ChinaSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

Mg–RE(Dy,Gd,Y)alloys show promising for being developed as biodegradable medical *** is found that the hydride REH_(2) could be formed on the surface of samples during their preparations with water *** amount of formed hydrides in Mg–RE alloys is affected by the content of RE and heat *** increases with the increment of RE *** the surface of the alloy with T4 treatment the amount of formed hydride REH_(2) is *** contrast,the amount of REH2 is lower on the surfaces of as-cast and T6-treated *** formation mechanism is attributed to the surface reaction of Mg–RE alloys with *** part of RE in solid solution in Mg matrix plays an important role in influencing the formation of hydrides.

关键词： Magnesium alloy Microstructure Hydride Heat treatment Rare earths

Role of multi-microalloying by rare earth elements in ductilization of magnesium alloys

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Journal of Magnesium and Alloys 2014年第1期2卷 1-7页

作者： Yuanding Huang Weimin Gan karl ulrich kainer Norbert Hort Institute of Materials Research Helmhlotz-Zentrum GeesthachtMax-Planck-Str.1D-21502 GeesthachtGermany

The present work investigates the influences of microalloying with rare earths on the mechanical properties of magnesium *** amount of each rare earth element is controlled below 0.4 wt.%in order not to increase the cost of alloy *** synergic effects from the multi-microalloying with rare earths on the mechanical properties are *** obtained results show that the as-cast magnesium alloys multi-microalloying with rare earths possesses a quite high ductility with a tensile strain up to 25-30%at room ***,these alloys exhibit much better corrosion resistance than AZ31 *** preliminary in situ neutron diffractions on the deformation of these alloys indicate that the multi-microalloying with rare earths seems to be beneficial for the activation of more slip *** deformation becomes more homogeneous and the resultant textures after deformation are weakened.

关键词： Microalloying Magnesium alloy Ductility Rare earth element

Influence of incorporating Si_(3)N_(4) particles into the oxide layer produced by plasma electrolytic oxidation on AM50 Mg alloy on coating morphology and corrosion properties

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Journal of Magnesium and Alloys 2013年第4期1卷 267-274页

作者： Xiaopeng Lu Carsten Blawert Nico Scharnagl karl ulrich kainer Helmholtz-Zentrum Geesthacht Zentrum fu¨r Material-und Kustenforschung GmbH Institute of Materials ResearchMax-Plank-Str.121502 GeesthachtGerma

The influence of incorporating different sizes of Si_(3)N_(4) particles on the microstructure and corrosion properties of a phosphate-based plasma electrolytic oxidation (PEO) coating on AM50 magnesium alloy was investigated. The experiments for this study were performed in alkaline electrolytes containing 1 g/L KOH, 10 g/L Na_(3)PO_(4) with and without three different sized of Si_(3)N_(4) particles. The corrosion properties of PEO coatings were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 0.5 wt.% NaCl solution. Microstructure observations by SEM showed that the surface morphology and composition of the PEO coating were affected greatly by particle addition. Si_(3)N_(4) particles can still be found without decomposition in the final coating due to their high melting point.

关键词： Magnesium Plasma electrolytic oxidation Microstructure Corrosion resistance

Influence of Ce addition on microstructure and mechanical properties of high pressure die cast AM50 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2013年第1期23卷 66-72页

作者： Faruk MERT Ahmet ZDEMIR karl ulrich kainer Norbert HORT Magnesium Innovation Center Helmholtz-Zentrum GeesthachtMax-Planck-Stra e 1D-21502 GeesthachtGermany Department of Manufacturing Engineering Faculty of TechnologyGazi UniversityTR-06500 AnkaraTurkey

The influence of Ce addition on the microstructure and mechanical properties of AM50 magnesium alloy was investigated to improve its mechanical *** results show that the addition of Ce to AM50 alloy results in the grain refinement and the mechanical properties of the Ce-modified AM50 at room and elevated temperatures are remarkably ***50 magnesium alloy containing 1% Ce（mass fraction） shows better refinement and mechanical properties compared with the AM50 magnesium alloy with 0.5% Ce and even AM50 alloy without any Ce.

关键词： AM50 magnesium alloy cerium die casting microstructure mechanical properties