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A novel Co-free high-entropy alloy with excellent antimicrobial and mechanical properties

Rare Metals 2025年第1期44卷 581-590页

作者： Wen-Yu Li Ming-Liang Wang Xiao-Di Wang Tong-Min Wang Ting-Ju Li Yi-Ping Lu Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

Microbiologically influenced corrosion and bacterial infection lead to serious losses to human production and *** alloys with inherent antibacterial properties is a vital way to solve the above ***,the widely used Cu-containing stainless steels show insufficient antimicrobial properties and relatively low yield strengths,which further limit their application in extreme service *** on the design concept of high-entropy alloys(HEAs),a novel low-cost Co-free CrFeNi_(0.5)Cu_(0.3)HEA with an optimal combination of antibacterial and mechanical properties was designed and *** alloy comprises triple-phase structures,including FeNi-rich face-centered cubic(FCC1),Cu-rich FCC2 and FeCr-rich body-centered cubic(BCC).The antibacterial rate of this HEA is up to 99.99%against Escherichia coli,which is far superior to that of classic 304 Cu-bearing stainless steel(304-Cu SS)and the most reported antibacterial *** addition,the HEA exhibits excellent mechanical properties with a tensile strength of 1032 MPa and yield strength of 842 MPa,far surpassing the corresponding values of 304-Cu SS(i.e.,528 MPa and 210 MPa,respectively).These findings provide new insights for the development of low-cost and high-performance antibacterial alloys.

关键词： High-entropy alloy Microstructure Antibacterial property Mechanical property

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A bio-inspired broadband absorption metamaterial:Driven by dual-structure synergistically induced current vortices

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材料科学技术（英文版） 2025年第3期206卷 193-201页

作者： Yuping Duan Chenyang Xia Wei Chen Hanxiao Jia Meng Wang Yupeng Shi Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

The performance breakthroughs of some stealth materials have benefited from incorporating biomimetic concepts,and the design ideas of wave-absorbing metamaterials have been greatly ***-ever,stealth materials developed based on a single biological structure still have limitations regarding overall performance and design ***,a dual-structure element combination model with a butterfly-wing porous structure and moth-eye raised structure arranged in an orderly manner is *** iron and polyurethane are mixed as wave absorbents,and the model is utilized to make a biomimetic metamaterial(CSMA),which has an absorption rate of more than 90％at 6.07-18 GHz,achieving broadband effective *** has been verified that the two biostructures designed after an ordered arrangement show synergistic effects in the combined model,and the cooperation between the structures induces the formation of current vector vortices,which are able to induce microwave losses to broaden the effective absorbing ***,the model has the combined application perfor-mance of polarization insensitivity,strong stability of oblique incidence,and low bistatic *** a thought based on the combination of multiple components provides an effective strategy for the design of broadband-absorbing metamaterials.

关键词： Bionic metamaterials Broadband stealth Current vector vortex Environmental adaptation

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Thermally-driven contraction asymmetric yolk-shell MnSe@C microsphere with boosted dielectric behaviors and microwave absorption

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Journal of Materials Science & technology 2024年第16期183卷 223-231页

作者： Hanxiao Jia Yuping Duan Chenxu Dou Likun Niu Naibo Wu Meng Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

The conventional selective template etching method to fabricate yolk-shell microwave absorbers is inconvenient and inefficient,so the thermally-driven contraction strategy was used to prepare asymmetric yolk-shell MnSe@C microsphere microwave absorbers via self-template directed *** self-templated oriented transformation enables compositional customization and enhances the template *** confinement effect of the carbon shell is crucial for realizing the thermally-driven contraction strategy and contributes to the strong conduction loss to MnSe@*** the other hand,the enhanced polarization loss benefits from the abundant heterogeneous interfaces and defects in the asymmetric yolk-shell MnSe@C *** rich cavities in the yolk-shell structure not only facilitate optimal impedance matching,but also promote the enhancement of multiple reflection loss(RL).As a result,the asymmetric yolk-shell MnSe@C microspheres obtain excellent microwave absorption perfor-mance,the minimum RL(RL_(min))and the maximum effective absorption bandwidth(EAB)reaching-54.4 dB and 5.1 GHz,respectively,at a thickness of 1.9 *** successful obtainment of the asymmetric yolk-shell MnSe@C microspheres paves the way for the convenient synthesis of the yolk-shell transitionmetal selenides(TMSs)microwave absorbers.

关键词： Thermally-driven contraction Yolk-shell MnSe Microwave absorption

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Effect of Ti Addition on Microstructure Evolution and Mechanical Properties of Al_(18)Co_(13)Cr_(10)Fe_(14)Ni_(45) Eutectic High-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第9期36卷 1493-1501页

作者： Jia-Qi Zheng Ming-Liang Wang Wen-Na Jiao Long-Jiang Zou Yan Di Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China

A series of new(Al_(18)Co_(13)Cr_(10)Fe_(14)Ni_(45))(100−x)Tix(x=0,0.5,1)eutectic high-entropy alloys(EHEAs)were designed and prepared with the aid of empirical parameter calculations and JMatPro software *** effects of Ti addition on the microstructures,phase structures,and mechanical properties of Al_(18)Co_(13)Cr_(10)Fe_(14)Ni_(45) EHEA were *** results show that(Al_(18)Co_(13)Cr_(10)Fe_(14)Ni_(45))_((100−x))Ti_(x)(x=0,0.5,1)EHEAs are composed of the FCC and B2 *** the increase in Ti content,the strength of the EHEAs *** volume fraction of the FCC phase decreases,and the volume fraction of B2 phase increases;the size of nanoprecipitates within the B2 phase decreases and the number of them increases,which could be responsible for the high strength due to the addition of *** them,(Al_(18)Co_(13)Cr_(10)Fe_(14)Ni_(45))99.5Ti0.5 alloy exhibited excellent properties with yield strength,ultimate tensile strength,and ductility of 690 MPa,1065 MPa,and 9.18%,respectively.

关键词： High-entropy alloys Eutectic Microstructure Mechanical properties

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Asymmetric electric field distribution enhanced hierarchical metamaterials for radar-infrared compatible camouflage

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Journal of Materials Science & technology 2023年第15期146卷 10-18页

作者： Tuo Zhang Yuping Duan Jiangyong Liu Hao Lei Jingxuan Sun Huifang Pang Lingxi Huang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China

Metamaterials are widely used in electromagnetic radiation and camouflage for their flexible wavefront manipulation and polarization over a broad spectrum ranging from microwaves to ***,multispectral compatible camouflage faces significant challenges due to tremendous scale differences of unit cells and desired radiative properties in various spectral *** study assembles a micron-scale infrared emitter,a millimeter-scale microwave absorber,and a metal reflector to propose a hierarchical metamaterial that reduces microwave scattering and reflects low-infrared *** a proof of concept,laser etching micro-manufactures an upper infrared shielding layer with a periodic metal *** the same time,bottom square frustum metastructure composites are fabricated and optimized based on genetic *** the normal incidence transverse electromagnetic wave with a 90°azimuth angle,the hierarchical strategy and infrared unit create an asymmetric electric field distribution of local near-field coupling,which is conducive to generating additional resonance for broadening the absorption *** verify the multispectral camouflage,which shows a high absorption efficiency of more than 90%,ranging from 3.6 to 6.2 and from 8.4 to 18 GHz with a total thickness of 4.05 mm(0.049λmax).Due to the non-reflection of surrounding thermal signals in the infrared 2-22μm region,low-infrared emissivity(0.29)metamaterials can adapt to various thermal *** methodology can provide a novel route for fabricating multispectral camouflage devices.

关键词： Hierarchical metamaterials Radar-infrared compatible stealth Genetic algorithm Magnetic-dielectric lossy composites Asymmetry

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Mold breakout prediction based on computer vision and machine learning

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Journal of Iron and Steel Research International 2024年第8期31卷 1947-1959页

作者： Yan-yu Wang Qi-can Wang Yong-chang Zhang Yong-hui Cheng Man Yao Xu-dong Wang School of Materials Science and Engineering Dalian University of TechnologyDalian 116024LiaoningChina Key Laboratory of Solidification Control and Digital Preparation Technology Dalian University of TechnologyDalian 116024LiaoningChina

Breakout is the most serious production accident in continuous casting and must be detected and predicted by stable and reliable *** sticking region,which forms on the local copper plate and expanded into a"V"shape,is the typical precursor of ***,computer vision technology was exploited to visualize the temperature change rate of the copper plate based on the temperature signals from thermocouples;then,the static and dynamic features of the abnormal sticking region were ***,logistic regression and Adaboost models were used to study and identify these features,resulting in the development of a mold breakout prediction model based on computer vision and machine *** test results demonstrate that the proposed model can effectively distinguish anomalous temperature patterns and considerably reduce false alarms without any missing *** a result,the proposed method could offer valuable insights into the realm of abnormality detection and prediction during continuous casting process.

关键词： Abnormality detection Image processing Adaboost Logistic regression Continuous casting

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Achieving excellent mechanical properties in Mg-5Bi-3Al alloy via ultra-fine grain and high-density precipitates

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Journal of Magnesium and Alloys 2025年第2期13卷 810-822页

作者： Hongrui Li Chong Wang Yukang An Enyu Guo Shuyan Shi Fengyun Yu Zongning Chen Huijun Kang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

The development of low-cost,high-performance Mg alloys is crucial to the industrial applications of large-scale production of Mg *** this work,extruded Mg-5Bi-3Al alloy with excellent mechanical properties is successfully prepared by modifying the extrusion temperatures(240℃and 300℃).The extruded alloy obtained ultra-high strength(yield strength=380 MPa,ultimate tensile strength=418 MPa)and excellent plasticity(elongation=10.2%)at the extrusion temperature of 240℃,the main contributing factors are primarily attributed to the synergistic effect of ultrafine recrystallized grain size(~0.5µm)and high density of Mg_(3)Bi_(2)*** faults within the sub-micron Mg_(3)Bi_(2)phase are observed in the E240 alloy,confirming the plastic deformation capability of Mg_(3)Bi_(2)*** effects of extrusion temperature on the microstructure,mechanical properties,and work-hardening behavior of the extruded Mg-5Bi-3Al alloys at room temperature are systematically *** results suggest that decreasing the extrusion temperature can refine recrystallized grain size and Mg_(3)Bi_(2)phase size,and the quantity of Mg_(3)Bi_(2)phase is increased,while increasing the extrusion temperature can improve the degree of recrystallization and weaken *** work hardening rate is increased with the increased extrusion temperature,mainly due to the coarsening of grains and precipitates,and the weakening of *** work provides an experimental basis for preparing high-performance wrought Mg-5Bi-3Al alloys.

关键词： Mg-Bi-Al alloy Extrusion temperature Dynamic precipitation Mechanical property Work-hardening behavior

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Influence of minor cerium addition on microstructure and fluidity of as-cast Al-Cu-Mn-Mg alloy

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Journal of Rare Earths 2025年第2期43卷 377-383,I0006页

作者： Yishan Wang Yu Bai Kaixi Jiang Wenxue Fan Puxuan Wang Hai Hao Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Research Institute of Dalian University of Technology Ningbo 315016China

Al-Cu-Mn alloys are widely used to produce automobile components like cylinder heads and engine blocks because of their capability to retain excellent thermal and mechanical characteristics at high ***,the Al-Cu-Mn-based alloys demonstrate restricted fluidity,leading to casting defects such as shrinkage and incomplete *** research investigated the microstructure and fluidity of Al-4.7Cu-1.0Mn-0.5Mg(wt%)alloy with minor cerium(Ce)*** as-cast alloys predominantly compriseα-Al matrix,accompanied by the presence of Al_(2)Cu,Al_(6)Mn,and Al_(8)Cu_(4)Ce *** influence of adding Ce on the fluidity of the Al-4.7Cu-1.0Mn-0.5Mg alloy was investigated using a trispiral fluidity test mold in this *** findings suggest that the addition of Ce within the range of 0.1 wt%to 0.5 wt%in the Al-4.7Cu-1.0Mn-0.5Mg alloy results in an enhancement in ***,the alloy containing 0.4 wt%Ce exhibits a significant increase in fluidity distance,from 349.7 to 485.7 *** improvement can be attributed to the reduction in viscosity,the refinement of secondary dendrite arm spacing,and the modification of secondary phase ***,a higher concentration of Ce leads to a decrease in fluidity length,potentially due to the formation of Al_(8)Cu_(4)Ce.

关键词： Al-Cu-Mn-Mg alloy Rare earths Ce addition Microstructure Fluidity

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Cut-wire metasurface embedded in magnetic mediums for ultra-wideband polarization-insensitive absorber with environmental adaptability

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Journal of Materials Science & technology 2024年第11期178卷 162-170页

作者： Jiangyong Liu Yuping Duan Tuo Zhang Yanan Liu Wei Chen Yupeng Shi Lingxi Huang Huifang Pang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116085China Key Laboratory of Functional Nanocomposites of Shanxi Province College of Materials Science and EngineeringNorth University of ChinaTaiyuan 030051China

Metamaterials with artificial designability and perfect absorption provide a novel design method for the manipulation and attenuation of ***,owing to the limitations of meta-atomic reso-nance effect and the lossless medium,it is difficult to achieve effective microwave absorption in a broad-band frequency ***,an ultra-wideband metamaterial absorber(UWMA)composed of two mag-netic media and a metasurface was designed,and the absorption bandwidth of 2.9 to 18 GHz for 90%absorptivity under normal incidence was achieved,covering almost the entire S,C,X,and Ku *** detailed investigation of equivalent circuit,equivalent medium theory,electromagnetic field dis-tribution and front-back interface interference,the internal physical working mechanism was clarified *** addition,the multi-environment adaptabilities of the proposed absorber,including polariza-tion sensitivity,large angle incidence,dual-station radar stealth,bearing capacity and corrosion resistance,were *** proposed metamaterial absorber presents an effective way to achieve ultra-wideband absorption and compatibility with environmental adaptability,and provides a new way of thinking for intelligent full-band stealth technology.

关键词： Metamaterial Microwave absorber Ultra-wideband Environmental adaptability Polarization-insensitive

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Influence of deformation on the corrosion behavior of LZ91 Mg-Li alloy

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 72-81页

作者： Xueqin Liu Xuejian Wang Enyu Guo Zongning Chen Huijun Kang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

The effect of rolling and forging on the microstructure and corrosion behavior of LZ91 alloy was investigated using an electron probe micro-analyzer,immersion and electrochemical *** showed that the area fraction of theβ-Li phase remained unchanged,and the grain size of theβ-Li phase decreased after *** as-rolled forged alloy(FR-LZ91)exhibited the highest area fraction of theβ-Li phase and the longest *** corrosion resistance of the forged LZ91 alloy increased due to grain refinement that prevented further corrosion during the immersion *** the experimental alloys,FR-LZ91 showed the highest resistance of corrosion film and charge transfer resistance values due to its protective film caused by the high area fraction of theβ-Li phase.

关键词： magnesium lithium alloy deformation electrochemical test corrosion behavior

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