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Anomalous microstructure and tribological evaluation of AlCrFeNiW_(0.2)Ti_(0.5)high-entropy alloy coating manufactured by laser cladding in seawater

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Journal of Materials Science & Technology 2021年第26期85卷 224-234页

作者： Hui Liang dongxu qiao Junwei Miao Zhiqiang Cao Hui Jiang Tongmin Wang Materials Science and Engineering Dalian University of TechnologyDalian116024China New Materials Innovation Center Ningbo Institute of Dalian University of TechnologyNingbo315000China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China

To evaluate the potential of high entropy alloys for marine applications,a new high entropy alloy coating of AlCrFeNiW_(0.2)Ti_(0.5)was designed and produced on Q235 steel via laser *** microstructure,microhardness and tribological performances sliding against YG6 cemented carbide,GCr15 steel and Si_(3)N_(4)ceramic in seawater were studied in *** AlCrFeNiW_(0.2)Ti_(0.5)coating showed an anomalous’sunflower-like’morphology and consisted of BCC and ordered B2 *** microhardness was approximately 692.5 HV,which was 5 times higher than *** coating showed more excellent tribological performances than Q235 steel and SUS304,a typical material used in seawater environment,sliding against all three coupled balls in ***,the wear and friction of AlCrFeNiW_(0.2)Ti_(0.5)coating sliding against YG6 in seawater were most *** main reason was the generation of Mg(OH)_(2),CaCO_(3),metal oxides and hydroxides and the formation of protective tribo-film on the worn surface of AlCrFeNiW_(0.2)Ti_(0.5)coating in the process of reciprocated *** would effectively hinder the direct contact between the worn surfaces of AlCrFeNiW_(0.2)Ti_(0.5)coating and YG6 ball,resulting in a decrease of friction coefficient and wear *** the YG6 was an ideal coupled material for AlCrFeNiW_(0.2)Ti_(0.5)coating in seawater,and the coating would become a promising wear-resisting material in ocean environment.

关键词： High-entropy alloy coating Laser cladding Microstructure Microhardness Tribological properties

Tensile deformation behavior and mechanical properties of a bulk cast Al0.9 CoFeNi2 eutectic high-entropy alloy

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Journal of Materials Science & Technology 2021年第2期61卷 119-124页

作者： Hui Jiang dongxu qiao Wenna Jiao Kaiming Han Yiping Lu Peter K.Liaw College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Stare Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Department of Materials Science and Engineering the University of TennesseeKnoxvilleTN37996USA

In this study,a new Al0.9CoFeNi2 eutectic high entropy alloy(EHEA) was designed,and the microstructures as well as the deformation behavior were *** bulk cast Al0.9CoFeNi2 EHEA exhibited an order face-centered cubic FCC(L12) and an order body-centered cubic(B2) dual-phase lamellar eutectic *** volume fractions of FCC(L12) and B2 phases are measured to be 60 % and 40 %,*** combination of the soft and ductile FCC(L12) phase together with the hard B2 phase resulted in superior strength of 1005 MPa and ductility as high as 6.2 % in tension at room *** Al0.9CoFeNi2 EHEA exhibited obvious three-stage work hardening characteristics and high workhardening *** evolving dislocation substructure s during uniaxial tensile deformation found that planar slip dominates in both FCC(L12) and B2 phases,and the FCC(L12) phase is easier to deform than the B2 *** post-deformation transmission electron microscopy revealed that the sub-structural evolution of the FCC(L12) phase is from planar dislocations to bending dislocations,high-density dislocations,dislocation network,and then to dislocation walls,and Taylor lattices,while the sub-structural evolution of the B2 phase is from a very small number of short dislocations to a number of planar ***,obvious ductile fracture in the FCC(L12) phase and a brittle-like fracture in the B2 phase were observed on the fracture surface of the Al0.9CoFeNi2 *** re search results provide some insight into the microstructure-property relationship.

关键词： Eutectic high-entropy alloy Microstructure Mechanical properties Deformation behavior

Effect of Niobium on Microstructure and Properties of the CoCrFeNb_xNi High Entropy Alloys

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Journal of Materials Science & Technology 2017年第7期33卷 712-717页

作者： Hui Jiang Li Jiang dongxu qiao Yiping Lu Tongmin Wang Zhiqiang Cao Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology （Liaoning Province） School of Materials Science and Engineering Dalian University of Technology Dalian 116024. China

A series of CoCrFeNb_xNi（x values in molar ratio, x = 0, 0.25, 0.45, 0.5, 0.75, 1.0 and 1.2） high entropy alloys（HEAs） was prepared to investigate the alloying effect of Nb on the microstructures and mechanical properties. The results indicate that the prepared CoCrFeNb_xNi（x 〉 0） HEAs consist of a simple FCC solid solution phase and a Laves phase. The microstructures of the alloys change from an initial single-phase FCC solid solution structure（x = 0） to a hypoeutectic microstructure（x = 0.25）, then to a full eutectic microstructure（x = 0.45） and finally to a hypereutectic microstructure（0.5 〈 x 〈 1.2）. The compressive test results show that the Nb0.45（x = 0.45） alloy with a full eutectic microstructure possesses the highest compressive fracture strength of 2558 MPa and a fracture strain of 27.9%. The CoCrFeNi alloy exhibits an excellent compressive ductility, which can reach 50% height reduction without fracture. The Nb0.25 alloy with a hypoeutectic structure exhibits a larger plastic strain of 34.8%. With the increase of Nb content, increased hard/brittle Laves phase leads to a decrease of the plasticity and increases of the Vickers hardness and the wear resistance. The wear mass loss, width and depth of wear scar of the Nb1.2（x = 1.2） alloy with a hypereutectic structure are the lowest among all alloy systems, indicating that the wear resistance of the Nb1.2 alloy is the best one.

关键词： Alloy design Microstructure Mechanical properties Wear resistance

Microstructure and mechanical properties of C_(x)Hf_(0.25)NbTaW_(0.5) refractory high-entropy alloys at room and high temperatures

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Journal of Materials Science & Technology 2022年第2期97卷 229-238页

作者： Shiyu Wu dongxu qiao Haitao Zhang Junwei Miao Hongliang Zhao Jun Wang Yiping Lu Tongmin Wang Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

The microstructure and mechanical properties of as-cast and isothermally annealed C_(x)Hf_(0.25)NbTaW_(0.5)(x=0,0.05,0.15,0.25)refractory high-entropy alloys(RHEAs)were *** the as-cast and annealed RHEAs consisted of disordered body-centered cubic solid solution phase and metal carbide(MC)phase with a face-centered cubic crystal structure(Fm-3 m space group).The primary carbides were enriched with Hf and C elements and tended to form lamellar eutectic-like microstructure in the *** lamellar eutectic-like structure in the interdendrites would be formed from the decomposition of sub-carbide M_(2)C under the influence of Hf *** isothermal annealing,slatted carbides were precipitated on the matrix,and the distribution became more uniform with high C *** formation of carbides strongly influenced the mechanical properties both at room and high *** yield strength values of C_(x)Hf_(0.25)NbTaW_(0.5) RHEA at 1473 and 1673 K were 792 and 749 MPa,*** result had exceeded the high temperature mechanical properties of currently known ***,this RHEA exhibited high-temperature performance stability and excellent plasticity,exceeding 30 and 50%at room and elevated temperatures(above 1273 K),*** thermal deformation,carbon-containing RHEAs obtained more severe work hardening than that of ACHO RHEAs,and required greater dynamic recrystallization to achieve the dynamic equilibrium.

关键词： Refractory high entropy alloys Mechanical properties Microstructure High temperature Carbon content

A novel Cu-bearing high-entropy alloy with significant antibacterial behavior against corrosive marine biofilms

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Journal of Materials Science & Technology 2020年第11期42卷 201-210页

作者： Enze Zhou dongxu qiao Yi Yang Dake Xu Yiping Lu Jianjun Wang Jessica A.Smith Huabing Li Hongliang Zhao Peter K.Liaw Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Department of Biomolecular Sciences Central Connecticut State University1615 Stanley StreetNew BritainCT 06050USA School of Materials Science and Engineering Zhengzhou University100 Kexue AvenueZhengzhou 450001China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA

The design of novel high-entropy alloys(HEAs)provides a unique opportunity for the development of structure-function integrated materials with high mechanical and antimicrobial *** this study,by employing the antibacterial effect of copper,a novel Al0.4CoCrCuFeNi HEA with broad-spectrum antibacterial and strong mechanical properties was *** concentrations of copper ions released from the HEA prevented growth and biofilm formation by biocorrosive marine bacterial *** findings serve as a proof-of-concept for further development of unique HEA materials with high antimicrobial efficiency and mechanical properties,compared to conventional antibacterial alloys.

关键词： High entropy alloys Biofilms Antibacterial property Mechanical properties

Enhanced antibacterial behavior of a novel Cu-bearing high-entropy alloy

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Journal of Materials Science & Technology 2022年第22期117卷 158-166页

作者： Guangyu Ren Lili Huang Kunling Hu Tianxin Li Yiping Lu dongxu qiao Haitao Zhang Dake Xu Tongmin Wang Tingju Li Peter K.Liaw Engineering Research Center of High Entropy Alloy Materials(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Food Science and Engineering Ocean University of ChinaQingdao 266100China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996United States

Contact infection of bacteria and viruses has been a critical threat to human health. The worldwideoutbreak of COVID-19 put forward urgent requirements for the research and development of the selfantibacterial materials, especially the antibacterial alloys. Based on the concept of high-entropy alloys, thepresent work designed and prepared a novel Co_(0.4)FeCr_(0.9)Cu_(0.3) antibacterial high-entropy alloy with superior antibacterial properties without intricate or rigorous annealing processes, which outperform the antibacterial stainless steels. The antibacterial tests presented a 99.97% antibacterial rate against Escherichiacoli and a 99.96% antibacterial rate against Staphylococcus aureus after 24 h. In contrast, the classic antibacterial copper-bearing stainless steel only performed the 71.50% and 80.84% antibacterial rate, respectively. The results of the reactive oxygen species analysis indicated that the copper ion release and theimmediate contact with copper-rich phase had a synergistic effect in enhancing antibacterial ***, this alloy exhibited excellent corrosion resistance when compared with the classic antibacterialstainless steels, and the compression test indicated the yield strength of the alloy was 1015 MPa. Thesefindings generate fresh insights into guiding the designs of structure-function-integrated antibacterial alloys.

关键词： High-entropy alloy Antibacterial property Corrosion resistance Mechanical property

Cu-bearing high-entropy alloys with excellent antiviral properties

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Journal of Materials Science & Technology 2021年第25期84卷 59-64页

作者： Zhong Li dongxu qiao Yan Xu Enze Zhou Chuntian Yang Xinyi Yuan Yiping Lu Ji-Dong Gu Sand Wolfgang Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Environmental Engineering Guangdong Technion Israel Institute of TechnologyShantou 515063Chin Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection College of Environmental Science and EngineeringDonghua UniversityShanghai201620China

The worldwide outbreak of COVID-19 since December 2019 has caused great challenges to health organizations,and brought tremendous impact on the global *** have been over62.3 million confirmed infection cases and 1.4 million deaths reported until now(December 1 st,2020),and the numbers are still growing[1].Although not as influential as COVID-19.

关键词： alloys entropy fir

Brittle-to-ductile transition in Ti–Pt intermetallic compounds

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Science Bulletin 2021年第22期66卷 2281-2287,M0003页

作者： Beikai Zhao Qinghua Zhang Xiaoqian Fu dongxu qiao Ling Zhang Xiao Chen Lin Gu Yiping Lu Qian Yu Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Beijing National Laboratory for Condensed Matter Physics Collaborative Innovation Center of Quantum MatterInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Phase transformation changes numerous properties of materials. Ti–Pt alloys have received much interest because of high martensitic transformation temperature. However, the intrinsic brittleness of these intermetallic compounds with low crystal symmetry and complicated phase structure limit their applications,especially when composition deviates from stoichiometry ratio. By performing in situ heating high-resolution scanning transmission electron microscopy experiment and micro-mechanical testing on Ti-35 at% Pt that contained majorly Ti3Pt and αTiPt phases, it was found that precipitating herringbone twinned αTiPt islands within Ti3Pt could occur upon heating, significantly refining mixed-phase structure. The refinement of multi-intermetallic mixed-phase structure endowed brittle material with remarkable capacity for plastic deformation and strain hardening. The plastic deformation mechanisms include phase transformation upon yielding and dislocation slips during hardening, which rarely occurs in intermetallic compounds with low symmetry. The strong interaction between different deformation modes even caused nano-crystallization along slip bands. The results demonstrate that brittle-toductile transition in intermetallic compounds can be achieved by tuning mixed-phase structure through phase transformations.

关键词： Intermetallic compounds Phase transformation Structure refinement Ductility Brittle-to-ductile transition

M型钢-混凝土组合剪力墙抗震性能有限元分析

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建筑结构 2023年第3期53卷 21-26,63页

作者：张国伟安佳宁高海智乔东需北京建筑大学大型多功能振动台阵实验室北京100044 北京建筑大学工程结构与新材料北京高等学校工程研究中心北京100044

为避免小剪跨比剪力墙在地震下发生脆性剪切破坏,提出一种M型钢-混凝土组合剪力墙,采用M型钢作为剪力墙竖向分布钢筋,具有整体性能好、抗扭刚度大、施工效率高等特点,在大震下呈现分缝受力的破坏模式,表现出良好的抗震性能。采用ABAQUS... 详细信息

为避免小剪跨比剪力墙在地震下发生脆性剪切破坏,提出一种M型钢-混凝土组合剪力墙,采用M型钢作为剪力墙竖向分布钢筋,具有整体性能好、抗扭刚度大、施工效率高等特点,在大震下呈现分缝受力的破坏模式,表现出良好的抗震性能。采用ABAQUS有限元软件对M型钢-混凝土组合墙体进行非线性拟静力分析,研究不同免拆模板类型、轴压比、水平钢筋配筋率对墙体的抗震性能的影响,对墙体的塑性损伤分布情况进行对比分析。结果表明:有限元模拟结果与试验结果吻合程度良好,墙体混凝土损伤呈两阶段分布。M型钢-混凝土组合墙体具有较大的承载力和抗侧刚度,免拆模板类型对墙体抗震性能影响不大,降低水平钢筋配筋率会使墙体承载力显著下降,加速刚度衰减,延性和耗能能力显著增强,减小轴压比会降低墙体承载力,但延性系数有所提高。

关键词： M型钢组合墙体抗震性能配筋率轴压比塑性损伤