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Towards implementation of alloy-specific thermo-fluid modelling for laser powder-bed fusion of mg alloys

Journal of Magnesium and alloys 2024年第6期12卷 2327-2344页

作者： Mohammad Hoseini-Athar Mikael Ersson Peter Hedström Department of Material Science and Engineering KTH Royal Institute of TechnologyStockholmSE-10044 Sweden

Multi-physics thermo-fluid modeling has been extensively used as an approach to understand melt pool dynamics and defect formation as well as optimizing the process-related parameters of laser powder-bed fusion(L-PBF).However,its capabilities for being implemented as a reliable tool for material design,where minor changes in material-related parameters must be accurately captured,is still in *** the present research,first,a thermo-fluid computational fluid dynamics(CFD)model is developed and validated against experimental *** the predicted material properties of the pure mg and commercial ZK60 and WE43 mg alloys,parametric studies are done attempting to elucidate how the difference in some of the material properties,i.e.,saturated vapor pressure,viscosity,and solidification range,can influence the melt pool *** is found that a higher saturated vapor pressure,associated with the ZK60 alloy,leads to a deeper unstable keyhole,increasing the keyhole-induced porosity and evaporation mass *** viscosity and wider solidification range can increase the non-uniformity of temperature and velocity distribution on the keyhole walls,resulting in increased keyhole instability and formation of ***,the WE43 alloy showed the best behavior in terms of defect formation and evaporation mass loss,providing theoretical support to the extensive use of this alloy in *** summary,this study suggests an approach to investigate the effect of materials-related parameters on L-PBF melting and solidification,which can be extremely helpful for future design of new alloys suitable for L-PBF.

关键词： mg alloys Laser powder-bed fusion(L-PBF) Melt pool dynamics Computational fluid dynamics Fluid flow

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Twinning aspects and their efficient roles in wrought mg alloys:A comprehensive review

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Journal of Magnesium and alloys 2024年第6期12卷 2201-2230页

作者： S.S.A.Shah Manping Liu Azim Khan Farooq Ahmad M.R.Abdullah Xingquan Zhang Shiwei Xu Zhen Peng School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Mechanical Engineering Anhui University of TechnologyMáanshan 243002China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

Twinning is widely recognized as an effective and cost-efficient method for controlling the microstructure and properties of wrought magnesium(mg)***,twins play a crucial role in initiating dynamic recrystallization(DRX),while twin regions experience rapid recrystallization during static recrystallization(SRX).The activation of twinning can lead to changes in lattice orientation,significantly impacting the final texture in mg *** active roles of twinning are influenced by various factors during the activation process,and the mobility of twin boundaries(TB)can be amplified by stress effects,dislocation interactions,and thermal ***,annealing treatments that involve proper segregation or precipitation on TBs serve to stabilize them,restraining their *** such as segregation may also alter the twinning propensity in Magnesium-rare earth(mg-RE)***{10-11}contraction twins(CT)and{10-11}-{10-12}double twins(DT)can promote dynamic recrystallization(DRX),they also pose a risk as potential sources of voids and ***,understanding the nucleation and growth mechanisms of twinning is crucial,and these aspects are briefly reviewed in this *** the factors mentioned above,this article summarizes the recent research progress in this field,shedding light on advancements in recent eras.©2024 Chongqing *** services provided by Elsevier *** behalf of KeAi Communications ***.

关键词： mg alloys Twinning Recrystallization Texture Mechanical properties

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Stress-corrosion coupled damage localization induced by secondary phases in bio-degradable mg alloys:phase-field modeling

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Journal of Magnesium and alloys 2024年第1期12卷 361-383页

作者： Chao Xie Shijie Bai Xiao Liu Minghua Zhang Jianke Du The Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211P.R.China Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province Hunan University of Science and TechnologyXiangtan 411201P.R.China

In this study,a phase-field scheme that rigorously obeys conservation laws and irreversible thermodynamics is developed for modeling stress-corrosion coupled damage(SCCD).The coupling constitutive relationships of the deformation,phase-field damage,mass transfer,and electrostatic field are derived from the entropy *** SCCD localization induced by secondary phases in mg is numerically simulated using the implicit iterative algorithm of the self-defined finite *** quantitative evaluation of the SCCD of a C-ring is in good agreement with the experimental *** capture the damage localization,a micro-galvanic corrosion domain is defined,and the buffering effect on charge migration is *** cases are investigated to reveal the effect of localization on corrosion acceleration and provide guidance for the design for resistance to SCCD at the crystal scale.

关键词： Phase field mg alloys Stress-corrosion coupled damage Damage localization Finite element method

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Alloying design and microstructural control strategies towards developing mg alloys with enhanced ductility

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Journal of Magnesium and alloys 2022年第5期10卷 1191-1206页

作者： Zhong-Zheng Jin Min Zha Si-Qing Wang Shi-Chao Wang Cheng Wang Hai-Long Jia Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun 130025China International Center of Future Science Jilin UniversityChangchun 130012China State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012China

Nowadays,magnesium(mg)alloys are promising lightweight structural materials,especially in transportation and aerospace fields,due to their inherent low density and high specific *** of the high-strength mg alloys exhibit poor formability and ductility at room temperature,which limit their wide ***,by proper alloying design and/or delicate microstructural control,some newly developed mg alloys,including rare-earth(RE)and RE-free ones,show enhanced ductility without significant loss of *** identify the critical reasons,recent researches on ductile mg alloys have been reviewed from the aspects of alloying design strategies and microstructural control via advanced processing ***,some outlooks on enhanced ductility of mg alloys are suggested,*** the beneficial effect of solute atoms,introducing second phase particles,tailoring bimodal-grained structures,introducing pre-twinning structures,*** current research progresses in alloying design and/or novel microstructural control have shed some lights on designing and producing mg alloys with enhanced ductility.

关键词： mg alloys Alloying Microstructure Ductility Strength

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A review of effective strides in amelioration of the biocompatibility of PEO coatings on mg alloys

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Journal of Magnesium and alloys 2022年第9期10卷 2354-2383页

作者： Arash Fattah-alhosseini Razieh Chaharmahali Kazem Babaei Meisam Nouri Mohsen K.Keshavarz Mosab Kaseem Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea

Recently,developing bioactive and biocompatible materials based on mg and mg-alloys for implant applications has drawn attention among researchers owing to their suitable body *** mg and its alloys reduces the risk of long-term incompatibility with tissues because of their close mechanical properties and no need for re-operation to remove the ***,the degradation rate of the implant needs to be controlled because production of hydrogen gas and accumulation of its bubbles increases local pH around the *** confine the integrity of implants and the body,the corrosion concern in the body fluid requires to be *** modification as one of the effective strategies can improve corrosion ***,it creates a suitable surface for bone grafting and cell *** development of proper surface-coated implants needs appropriate techniques and *** electrolytic oxidation(PEO)coating can provide long-term protection by providing a ceramic layer and improving the implant’s ***,a general review of in-vivo and in-vitro evaluation of PEO coatings on mg and mg-alloys has been carried *** advances in surface modification on mg and mg-alloys have been discussed,however,the need for reliable laboratory models to predict in-vivo degradation is still valid.

关键词： mg alloys Biodegradation Surface modification In-vivo In-vitro PEO coatings

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Effects of heat treatment on the corrosion behavior and mechanical properties of biodegradable mg alloys

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Journal of Magnesium and alloys 2022年第7期10卷 1737-1785页

作者： Meysam Mohammadi Zerankeshi Reza Alizadeh Ehsan Gerashi Mohammad Asadollahi Terence G.Langdon Department of Materials Science and Engineering Sharif University of TechnologyTehranIran Materials Research Group Department of Mechanical EngineeringUniversity of SouthamptonSouthampton SO171BJUnited Kingdom

Biodegradable magnesium(mg)alloys exhibit great potential for use as temporary structures in tissue engineering *** degradable implants require no secondary surgery for their *** addition,their comparable mechanical properties with the human bone,together with excellent biocompatibility,make them a suitable candidate for fracture ***,some challenges *** degradation of the mg-based alloys in physiological environments leads to a loss of the mechanical support that is needed for complete tissue healing and also to the accumulation of hydrogen gas bubbles at the interface of the implant and *** different methods used to improve the performance of the biodegradable mg alloys to address these challenges,it appears that heat treatment is the most effective way to modify the microstructure and thus the corrosion behavior and mechanical properties without changing the composition or shape of the alloys.A desirable combination of corrosion and mechanical properties can be obtained through a precise control of the heat treatment *** this report,the effects of different heat treatments(T4 and T6)on the microstructure,corrosion behavior,and mechanical properties of some of the most important heat-treatable biodegradable mg alloys(mg-Zn,mg-Gd,mg-Y,mg-Nd,mg-Al and mg-Ag)are examined as well as new perspectives to enhance their clinical implementation.

关键词： Biodegradable implants Corrosion rate Heat treatment Mechanical properties mg alloys

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The mechanisms of grain growth of mg alloys:A review

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Journal of Magnesium and alloys 2022年第9期10卷 2384-2397页

作者： Qinghua Chen Ruinan Chen Jian Su Qingsong He Bin Tan Chao Xu Xu Huang Qingwei Dai Jian Lu School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China Department of Mechanical Engineering City University of Hong KongHong KongChina

Grain growth directly influences the plasticity and strength of mg *** the grain size decreases from the microscale to the nanoscale,the plasticity of mg alloys continually increases,whereas the strength first increases and later *** trends are observed because the plastic deformation mechanism changes from dislocation–twinning dominance to grain boundary *** this study,the factors influencing grain growth,such as the temperature of plastic deformation/annealing,second-phase particles and solute atoms,are examined to aid effective control of the grain ***,the mechanisms of grain growth,typically induced by strain and thermal activation,are ***-induced grain boundary migration is attributable to the difference in the strain energy stored in adjacent grains with high-density ***-induced grain boundary migration is driven by the difference in the energy of the grain boundary/subgrain boundary and boundary *** grain growth can be induced by anisotropy of the strain energy,anisotropy of the grain boundary mobility,depinning of the second phase and high misorientation gradient.

关键词： mg alloys Grain growth Mechanical properties Microstructure

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Effects of pre-aging on microstructure evolution and deformation mechanisms of hot extruded mg–6Zn–1Gd–1Er mg alloys

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Journal of Magnesium and alloys 2023年第1期11卷 317-328页

作者： Wei Kang Liwei Lu Longbiao Feng Fengchi Lu Chunlei Gan Xiaohui Li School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan 411201PR China Guangdong Institute of Materials and Processing Guangdong Academy of SciencesGuangzhou 510650PR China School of Mechatronics Engineering and Automation Foshan UniversityFoshan 528000PR China Guangdong Tsing Impulse Science and Technology Co.Ltd. Foshan 528226PR China

The influence of pre-aging treatment on the microstructure,texture and mechanical properties of the mg–6Zn–1Gd–1Er(wt.%)alloy was *** microstructure analysis shows that the presence of pre-aging is beneficial to{1012}twin nucleation at the early stage of extrusion and inhibits the growth of twins and promotes the formation of[1010]-fiber texture components,thus accelerating the complex process of *** the middle stage of extrusion,the extruded samples under the condition of solid solution were subjected to dynamic precipitation during severe shear *** precipitation of the second phase particles followed the particle stimulating nucleation(PSN)mechanism,which increased the volume fraction of DRX grains during *** the extruded samples under the peak-aged condition,the particles appear dissolved during the severe shear deformation strain,which slows down the DRX *** the later stage of extrusion,the small rod-shaped particles followed the PSN mechanism,and finally formed the strong fiber *** extruded alloy exhibits the strongest mechanical properties under the peak-aged state,with ultimate tensile strength(UTS)of 346 MPa,tensile yield strength(TYS)of 217 MPa,and elongation to failure(EL)of 13.6%.The improvement of mechanical properties is mainly attributed to the existence of strong fiber texture,small rod-shaped and block-shaped phases.

关键词： mg alloys Pre-aging Extrusion Texture Dynamic recrystallization

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Coupling physics in machine learning to investigate the solution behavior of binary mg alloys

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Journal of Magnesium and alloys 2022年第10期10卷 2817-2832页

作者： Tao Chen Qian Gao Yuan Yuan Tingyu Li Qian Xi Tingting Liu Aitao Tang Andy Watson Fusheng Pan National Engineering Research Center for Magnesium alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400000PR China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400000PR China Faculty of Materials and Energy Southwest UniversityChongqing 400715PR China Hampton Thermodynamics Hampton TW121NLUnited Kingdom

The solution behavior of a second element in the primary phase(α(mg))is important in the design of high-performance *** this work,three sets of features have been collected:a)interaction features of solutes and mg obtained from first-principles calculation,b)intrinsic physical properties of the pure elements and c)structural *** on the maximum solid solubility values,the solution behavior of elements inα(mg)are classified into four types,e.g.,miscible,soluble,sparingly-soluble and *** machine learning approach,including random forest and decision tree algorithm methods,is performed and it has been found that four features,e.g.,formation energy,electronegativity,non-bonded atomic radius,and work function,can together determine the classification of the solution behavior of an element inα(mg).The mathematical correlations,as well as the physical relationships among the selected features have been *** model can also be applied to other systems following minor modifications of the defined features,if required.

关键词： mg alloys Solid solubility Machine learning First-principles calculation Diagrammatic method

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Impressive strides in amelioration of corrosion and wear behaviors of mg alloys using applied polymer coatings on PEO porous coatings:A review

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Journal of Magnesium and alloys 2022年第5期10卷 1171-1190页

作者： Arash Fattah-alhosseini Razieh Chaharmahali Kazem Babaei Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

Magnesium(mg)and its alloys have received much attention in a lot of areas due to their special chemical and physical ***,high corrosion rates are a limiting *** plasma electrolytic oxidation(PEO)technique is a simple approach to place an oxide film on the surface of light metals like mg *** method has been considered for controlling the rate of corrosion and improving some other *** the other hand,PEO coatings cannot make enough protection of Magnesium alloys for a long time due to porosity and fine ***,PEO-based composite coatings are used to make adequate corrosion protection on the mg alloys *** popularity of these coatings is due to their good corrosion resistance,simplicity,high coating capability,and cost-effectiveness in complex *** of an organic layer on the surface of PEO coating is one of the effective methods to close the defects and thus prevent the corrosive species penetration into the *** the PEO coating with a polymer layer can be a good solution to control the amount of damage and improve the corrosion and abrasion *** addition,PEO coating can eliminate the problems of insufficient adhesion of polymer coatings and is considered as a suitable base for composite *** review paper presents the corrosion and abrasion behavior of the PEO/Polymer dual coating system on mg *** the fundamental role of coatings thickness and morphology in wear and corrosion behavior,these aspects have been highly discussed in this study.

关键词： Composite coating mg alloys PEO Polymer Corrosion properties Wear resistance

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