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Mechanical property and cellular structure of an additive manufactured FeCoNiCrMo_(0.2) high-entropy alloy at high-velocity deformation

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Journal of Materials Science & Technology 2023年第8期139卷 156-166页

作者： Wenshu Li YiYu Huang ZhongHao Xie Haoyu Chen Weihua Li Bin Liu Bingfeng Wang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China

The microstructural modification for cellular structures can achieve the improvement of dynamic me-chanical properties of a selective laser melted FeCoNiCrMo_(0.2)high-entropy alloy(SLM-FeCoNiCrMo_(0.2)HEA)and can expand its promising applications in the field of high-velocity *** this work,FeCoNiCrMo_(0.2)HEAs with cellular structures in different sizes were produced by selective laser melt-ing(SLM)with different process *** dynamic mechanical properties and microstructure of the SLM-FeCoNiCrMo_(0.2)HEA were *** dynamic mechanical properties of the SLM-FeCoNiCrMo_(0.2)HEA increased with decrease of average size of cellular structures,and the values of them were sensitive to strain *** energy absorption,compressive strength and yield strength of the SLM-FeCoNiCrMo_(0.2)HEAs reached 315.6 MJ/m^(3),2.2 GPa and 775.6 MPa,respectively at a strain rate of 2,420 s^(−1),under the process parameters of laser power and scanning speed of 330 W and 800 mm/s,respectively,where the corresponding average size of cellular structures in the HEAs was 483.6 *** value of strain-hardening rate of the SLM-FeCoNiCrMo_(0.2)HEA was about 5.1 GPa at a strain level of 0.1,which was much higher than that of the powder-metallurgy FeCoNiCrMo_(0.2)*** cellular structure was formed inside the molten pool with segregation of Mo on the *** localization appeared in the cellular structures,forming several deformation bands after high strain-rate *** elemental segre-gation strengthening and dislocation strengthening are considered to be the main strengthening mecha-nisms in SLM-FeCoNiCrMo_(0.2)HEA.

关键词： FeNiCr-based HEA Additive manufacturing Mechanical property Cellular structure strengthening mechanisms

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Mechanical behavior of TiAl alloys

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Science China(Technological Sciences) 2023年第9期66卷 2457-2480页

作者： XIANG HengGao CHEN Yang QI ZhiXiang ZHENG Gong CHEN FengRui CAO YueDe LIU Xu ZHOU Bing CHEN Guang National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

Intermetallic TiAl alloys attract much attention in advanced engineering fields due to their low density(3.9–4.2 g/cm3) and excellent high-temperature properties. After more than half a century of research and development, TiAl alloys have found applications in aerospace, automotive, and related industries. However, as a kind of semi-brittle materials, intermetallic TiAl alloys exhibit different mechanical behavior from metallic and ceramic materials. Thus, it is necessary to systematically understand their mechanical behavior to ensure further developments and safe engineering applications. In this paper, the principal mechanical behavior of Ti Al alloys was reviewed comprehensively, including tension, creep, fatigue, and strengthening mechanisms. The mechanical performance and the corresponding deformation mechanisms are summarized and discussed in detail. The future directions of mechanical research on TiAl alloys are also overviewed to expedite their extensive utilization in engineering fields.

关键词： TiAl tension creep fatigue strengthening mechanisms

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Review on long-period stacking-ordered structures in Mg-Zn-RE alloys

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Rare Metals 2012年第3期31卷 303-310页

作者： Lu, Fumin Ma, Aibin Jiang, Jinghua Yang, Donghui Zhou, Qi National Engineering Research Center Hohai University Nanjing 210098 China College of Mechanics and Materials Hohai University Nanjing 210098 China

The recent development of high-strength magnesium alloys is focused on the role of the strengthening phases with a novel long-period stacking-ordered (LPSO) structure. This review detailed the main factors influencing the formation of LPSO phases, including alloying ele-ments, preparation methods, and heat treatments. Furthermore, process control in structure types, formation and transformation behavior, strengthening and toughening mechanisms of the LPSO phase were discussed. Finally, the current problems and development trends of high-strength Mg-Zn-RE alloys were also put forward.

关键词： magnesium alloys long-period stacking-ordered (LPSO) structure formation transformation strengthening mechanisms

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Microstructure Evolution and Tensile Properties of the Alx(CoCrNi)100-x Medium-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 2045-2057页

作者： Ji-Peng Zou Xue-Mei Luo Bin Zhang Guo-Dong Liu Hong-Lei Chen Xiao-Fei Zhu Wen-Ke Yang Guang-Ping Zhang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

A series of Alx(CoCrNi)100-x(x=0-21 at.%)medium-entropy alloys(MEAs)were designed and prepared to investigate the effects of Al addition on the microstructures and tensile *** results reveal that the lattice structure changes from the initial single FCC structure(x<10 at.%),to the FCC and disordered BCC structures(x=10 and 11 at.%),then to the FCC and BCC/B2 structures(11

关键词： Medium-entropy alloys Microstructures Tensile properties strengthening mechanisms

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Oxygen-assisted spinodal structure achieves 1.5 GPa yield strength in a ductile refractory high-entropy alloy

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Journal of Materials Science & Technology 2023年第26期157卷 11-20页

作者： Dingcong Cui Yuyu Zhang Linxiang Liu Yue Li Lei Wang Zhijun Wang Junjie Li Jincheng Wang Feng He State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China

Refractory high-entropy alloys(RHEAs)with room-temperature ductility are drawing growing attention for potential high-temperature ***,the most widely used metallurgical mechanisms appear weak in optimizing their strength and ***,we report that the nanoscale spinodal struc-ture in Ti_(41)V_(27)Hf_(15)Nb_(15)O_(2)leads to the highest tensile yield strength(∼1.5 GPa)among the existing RHEAs and good elongation of∼12%.With the aid of thermodynamic calculations,we show that oxygen plays a dominant role in controlling the formation of the spinodal structure by influencing the spinodal gap of the Ti-V-Hf-Nb *** the atomic structure of the spinodal structure(β+β^(∗)),we showed that the large lattice misfit of the spinodal phases is mainly responsible for the excellent strengthen-ing effect while the planar to wavy dislocation glide mode transition accounts for the retained *** work provides a novel strategy to improve the mechanical properties of the RHEAs and deepens the understanding of their phase stabilities.

关键词： High entropy alloys Spinodal decomposition strengthening mechanisms

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Microstructure and strength in ultrastrong cold-drawn medium carbon steel

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Journal of Materials Science & Technology 2022年第2期97卷 89-100页

作者： Hanchen Feng Lei Cai Linfeng Wang Xiaodan Zhang Feng Fang Jiangsu Key Laboratory of Advanced Metallic Materials Southeast UniversityNanjing 211189China Sunnywell(China)New Material Technology Co.Ltd Changzhou 213200China Technical center of Baosteel Metal Co. LtdShanghai 200940China Department of Mechanical Engineering Technical University of DenmarkLyngbyDenmark

Via traditional wire drawing,the medium carbon ferrite-pearlite(MCFP)steel wires can achieve the ultrahigh strength beyond 4 GPa normally for high-carbon pearlitic steel wires,but have a 30-60%lower production *** microstructural evolution and mechanical properties of medium carbon ferrite-pearlite steel wires have been investigated by means of scanning electron microscopy,transmission electron microscopy and tensile *** tensile strength of medium carbon ferrite-pearlite steel wires increases from 750 MPa up to 4120 MPa when the drawing strain increases up toε=6.4,which represents the highest strength reported so far-to our knowledge for a carbon steel with such low carbon *** low and medium strains(ε≤1.95),the proeutectoid ferrite forms dense dislocation walls(DDWs)via dislocation activities,including sliding,accumulation,interaction,and *** the drawing strain increase,the reorientation of DDWs to the drawing direction forms the coarse proeutectoid ferrite ***,the proeutectoid ferrite deformed to high strains is characterized by a lamellar morphology and the average lamellar spacing of proeutectoid ferrite is about 55 nm atε=*** interlamellar spacing of pearlite and thickness of cementite decreases with the drawing strain *** dislocation density in ferrite lamellae increases with the drawing strain increases,and the dislocation density in ferrite lamellae is 7.8×10^(15)m^(2)atε=4.19.A higher dislocation density of 3.1×10^(16)m^(2)can be obtained atε=6.4 by means of extrapolation and TEM *** stress contributions of proeutectoid ferrite and pearlite to the flow stress are estimated based on quantified structural *** on the assumption that the stress contributions from different strengthening mechanisms are linearly additive and the general rule of mixtures,a good agreement between the measured and estimated flow stresses has been found in a large range of flow *** good applica

关键词： Medium carbon ferrite-pearlite steel strengthening mechanisms Microstructure Mechanical properties Strength

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Graphene nanoplatelets-reinforced magnesium metal matrix nanocomposites with superior mechanical and corrosion performance for biomedical applications

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Journal of Magnesium and Alloys 2020年第1期8卷 269-290页

作者： Khurram Munir Cuie Wen Yuncang Li School of Engineering RMIT UniversityMelbourneVictoria 3001Australia

Magnesium(Mg)metal matrix composites(MMCs)reinforced with graphene nanoplatelets(GNPs)have been developed by powder metallurgy(PM).GNPs with different concentrations(0.1,0.2,and 0.3 wt.%),layer thicknesses(5 nm and 9 nm),and particle sizes(15μm and 5μm)were dispersed into Mg powder by high-energy ball-milling *** microstructure and mechanical properties of the fabricated composites were characterized using transmission electron microscopy(TEM),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),Raman spectroscopy(RS),and compression *** corrosion resistance was evaluated by electrochemical tests and hydrogen evolution *** cytotoxicity of Mg-GNPs composites was assessed using osteoblast-like SaOS2 *** results indicate that GNPs are excellent candidates as reinforcements in Mg matrices for the manufacture of biodegradable Mg-based composite *** addition improved the mechanical properties of Mg via synergetic strengthening ***,retaining the structural integrity of GNPs during processing improved the ductility,compressive strength,and corrosion resistance of the Mg-GNP *** assessments did not reveal any significant toxicity with the addition of GNPs to Mg *** study demonstrates that Mg-xGNPs with x<0.3 wt.%,may constitute novel biodegradable implant materials for load-bearing applications.

关键词： In vitro cytotoxicity Biocorrosion Magnesium-graphene composite Mechanical properties strengthening mechanisms

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MgO-attached graphene nanosheet(MgO@GNS)reinforced magnesium matrix nanocomposite with superior mechanical,corrosion and biological performance

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2062-2076页

作者： S.Abazari A.Shamsipur H.R.Bakhsheshi-Rad M.S.Soheilirad F.Khorashadizade S.S.Mirhosseini Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National Standards Organization of Hormozgan HormozganIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials and Metallurgical Engineering Iran University of Science and TechnologyTehranIran

Magnesium(Mg)alloys are gaining great consideration as body implant materials due to their high biodegradability and ***,they suffer from low corrosion resistance and antibacterial *** this research,semi-powder metallurgy followed by hot extrusion was utilized to produce the magnesium oxide@graphene nanosheets/magnesium(MgO@GNS/Mg)composite to improve mechanical,corrosion and cytocompatibility *** have revealed that the incorporation of MgO@GNS nanohybrids into Mg-based composite enhanced microhardness and compressive *** vitro,osteoblast cell culture tests show that using MgO@GNS nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of MgO@GNS nanoparticles in the composites decreased the opening defects,micro-cracks and micro-pores of the composites thus preventing the penetration of the corrosive solution into the *** demonstrated that the MgO@GNS/Mg composite possesses excellent antibacterial properties because of the combination of the release of MgO and physical damage to bacterium membranes caused by the sharp edges of graphene nanosheets that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the MgO@GNS/Mg composite with high mechanical strength,antibacterial activity and corrosion resistance is considered to be a promising material for load-bearing implant applications.

关键词： metal matrix composites MgO@GNS nanohybrid strengthening mechanisms antibacterial activity biocompatibility

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Journal of Materials Science & Technology 2022年第1期96卷 248-261页

作者： Seyedmohammad Tabaie Farhad Rézaï-Aria Bertrand C.D.Flipo Mohammad Jahazi Department of Mechanical Engineering École de Technologie Supérieure(ÉTS)H3C 1K3 MontrealQCCanada Institut Clément Ader(ICA) Universitéde ToulouseCNRSIMT Mines AlbiINSAUPSISAECampus Jarlard81013 AlbiFrance TWI Ltd Granta ParkGreat AbingtonCambridge CB216ALUnited Kingdom

The continuous growth in the manufacture of aerospace components such as blisks has led to an increase in the application of different hybrid materials fabricating methods,and thus the requirements for joining and strengthening of dissimilar *** to this goal,selective laser melted(SLM)Inconel718 was joined with forged AD730^(TM)Nickel-based superalloy through linear friction welding(LFW)in this *** variation,specifically with respect to secondary phases precipitation was *** microhardness and strengthening mechanisms of the weldment were also *** precipitation(volume fraction and size of particles)at different regions of both sides of the weld line was *** to the weld line,the dissolution ofγ’/γ"and Laves phases and grain refinement occurred which reveals the effects of both compression strain and high temperature on recrystallization and high degree of elemental diffusion in the weld zone(WZ).It is shown that the size,volume fraction,and shape of secondary phases increased and changed(from spherical to long-striped for Laves particles)as we went from the WZ toward the base ***,the measured microhardness indicated that the strength of AD730^(TM)alloy depends significantly on the grain size,while strength in SLM Inconel 718 was dominated by shape(or size)and the presence of secondary phases(γ’/γ"and Laves).

关键词： Additive manufacturing Linear friction welding Ni-based superalloy Precipitation Microhardness strengthening mechanisms

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Tailoring nanoprecipitates for ultra-strong high-entropy alloys via machine learning and prestrain aging

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Journal of Materials Science & Technology 2021年第10期69卷 156-167页

作者： Tao Zheng Xiaobing Hu Feng He Qjngfeng Wu Bin Han Chen Da Junjie Li Zhijun Wang Jincheng Wang Ji-jung Kai Zhenhai Xia C.T.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Institute of Atomic and Molecular Science.Shaanxi University of Science and Technology Xi'an710021China Department of Material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina Department of Materials Science and Engineering University of North TexasDentonTXUSA Center for Advanced Structural Materials Department of Mechanical EngineeringCollege of Science and EngineeringCity University of Hong KongHong KongChina

The multi-principal-component concept of high-entropy alloys(HEAs) generates numerous new *** them,nanoscale precipitated HEAs have achieved superior mechanical properties and shown the potentials for structural ***,it is still a great challe nge to find the optimal alloy within the numerous *** to now,the reported nanoprecipitated HEAs are mainly designed by a trialand-error approach with the aid of phase diagram calculations,limiting the development of structural *** the current work,a novel method is proposed to accelerate the development of ultra-strong nanoprecipitated *** the guidance of physical metallurgy,the volume fraction of the required nanoprecipitates is designed from a machine learning of big data with thermodynamic foundation while the morphology of precipitates is kinetically tailored by prestrain *** a proof-of-principle study,an HEA with superior strength and ductility has been designed and systematically *** newly developed γ’-strengthened HEA exhibits 1.31 GPa yield strength,1.65 GPa ultimate tensile strength,and 15% tensile *** probe tomography and transmission electron microscope characterizations reveal the well-controlled high γ’ volume fraction(52%) and refined precipitate size(19 nm).The refinement of nanoprecipitates originates from the accelerated nucleation of the γ’ phase by prestrain aging.A deeper understanding of the excellent mechanical properties is illustrated from the aspect of strengthening mecha ***,the versatility of the current design strategy to other precipitation-hardened alloys is discussed.

关键词： High-entropy alloys Machine learning Prestrain aging Mechanical properties strengthening mechanisms

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