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

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

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Ductile and ultrahigh-strength eutectic high-entropy alloys by large-volume 3D printing

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Journal of Materials Science & Technology 2022年第31期126卷 15-21页

作者： Yiping Lu Xiaoxiang Wu Zhenghong Fu Qiankun Yang Yong Zhang Qiming liu Tianxin li Yanzhong Tian Hua Tan Zhiming li Tongmin Wang tingju li High Entropy Alloy Material Engineering Research Center(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Iron and Steel Soochow UniversitySuzhou 215137China School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

*** Additive manufacturing or 3D printing outweighs conventional casting methods in the aspect of complex parts fabrication,which can realize one-step formation without the need of complicated cast dies.3D printing significantly promotes industrial production for making near-net shaped ***,this promising technique is not always ideally applicable for metals and *** example,titanium alloys prepared by 3D printing often suf-fer from poor plasticity,and usually require further complex heat treatment or hot isostatic pressing treatment,in order to remove internal stress and regulate plasticity and strength[1,2],which de-feats the original intention of employing additive *** of the fundamental causes for such issues is the low fluidity of the alloys upon melting,leading to great chemical heterogeneity,high porosity content and residual *** limitation hinders further design and fabrication of high-performance printable alloys from large scale production and application.

关键词： alloys strength eutectic

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A promising new class of plasticine: Metallic plasticine

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Journal of Materials Science & Technology 2018年第2期34卷 344-348页

作者： Yiping Lu Zhongyi Tang Bin Wen Gang Wang Shiwei Wu Tongmin Wang Yubo Zhang Zongning Chen 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 State Key Laboratory of Metastable Materials Science and Technology Yanshan University Laboratory for Microstructures Institute of Materials Shanghai University Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Dalian University of Technology) Ministry of Education

Soft, malleable, and non-dry on exposure in air are the typical features for plain plasticine, which lead plasticine to be widely used in many industrial fields and our daily life. As a kind of clay, poorly elec- tric conductivity and thermal conductivity of plain plasticine seriously limit its applications. Therefore, synthesizing a kind of plasticine having metallic bond is of importance for extending its applications in some special cases, such as thermal-cooling medium, anti-static electricity, electromagnetic shielding, etc. Here, we report a novel GalnSnCdZn2 alloy, which exhibits similar behavior as compared to those of plasticine at near room temperature （30-40 ℃）, and a good electrical conductivity due to its nature of metal. This new GalnSnCdZn2 alloy can be called as metallic plasticine that contains the near-eutectic structure with low melting point and the other relatively high melting point phases. In this metallic plas- ticine, the near-eutectic structure with low melting point plays the same role as the oily ingredient in plain plasticine, dominating the plastic deformation, while the other relatively high melting point phases act as the stuffing like the CaCO3 in plain plasticine. The creation of metallic plasticine offers a general strategy for designing/preparing a new class of plasticine which possesses both the nature of metal and plasticine.

关键词： Metallic plasticine Alloy design Conductivity Microstructure design Microstructure

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Aligning Crystal Orientation of Poly-Crystalline Bi-Te With a High Magnetic Field

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Journal of Iron and Steel Research International 2012年第S2期19卷 1039-1043页

作者： Hoyoung KIM Dong Hwan KIM Cham KIM tingju li DGIST Dalian University of Technology

We investigated the effect of aligning crystal orientation in the microstructures containing sub micro-sized grains on the thermoelectric properties for polycrystalline Bi-Te ***-Te powder,prepared through the conventional pulverization process,was sufficiently dispersed in an appropriate solvent,and then was formed into c-axis aligned green bodies under a designated high magnetic *** green bodies were sintered with spark-plasma-sintering *** degree of crystal alignment of sintered bodies was examined with the electron-back-scatter-diffraction SEM and the X-ray diffraction *** was observed that for both p and n type thermoelectric Bi-Te materials,aligning crystal orientation properly made electrical resistivity decreased with keeping Seebeck coefficient and thermal conductivity remained *** a typical result,the aligned Bi-Te material with the magnetic field of 10 tesla showed 30%enhancement of the thermoelectric performance.

关键词： thermoelectric Bi-Te crystal orientation alignment high magnetic field

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Excellent strength-ductility combination of Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy at cryogenic temperatures

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Journal of Materials Science & Technology 2023年第23期154卷 166-177页

作者： Xuzhou Gao Wei Jiang Yiping Lu Zhigang Ding Jizi liu Wei liu Gang Sha Tongming Wang tingju li Isaac T.H.Chang Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Solidification Control and Digital Preparation Technology (liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing 210094 China Metallurgy and Head of liquid Metal Engineering (liME) Doctoral Training Centre Brunel Centre for Advanced Solidification Technology (BCAST) Brunel University London Uxbridge UB8 3PH UK

In the present study,a face-centered cubic non-equiatomic Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy(HEA)with a low stacking fault energy of 17.6 mJ m^(−2) was prepared by vacuum induction melting,forging and annealing *** recrystallized sample is revealed to exhibit an excellent combination of strength and ductility over a wide temperature range of 4.2–293 *** decreasing temperature from 293 to 77 K,the ductility and ultimate tensile strength(UTS)gradually increase by 30% to 95% and 137% to 1020 MPa,*** the lowest temperature of 4.2 K,the ductility keeps 65% and the UTS increases by 200% to 1300 MPa,which exceed those published in the literature,including conventional 300 series stainless *** microstructural analyses of this alloy reveal a change of deformation mechanisms from dislocation slip and nano-twinning at 293 K to nano-phase transformation at 4.2 *** cooperation and competition of multiple nano-twinning and nano-phase transformation are responsible for the superior tensile properties at cryogenic *** study provides experimental evidence for potential cryogenic applications of HEAs.

关键词： High-entropy alloys Strength and ductility Cryogenic temperature Twinning Phase transformation

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Fabrication and Characterization of Ni-Al_2O_3 Nano-Composite Coatings by Sediment Co-Deposition

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稀有金属材料与工程 2009年第A03期38卷 68-72页

作者： Feng Qiuyuan Zhang Jian li tingju Qi Kai Zhang Xiaoli Teng Haitao Zhang Yu liu Changsheng Jin Junze State Key Laboratory of Materials Modification Dalian University of Technology Dalian 116024 China Northeastern University Shenyang 110004 China

Ni-Al2O3 nano-composite coatings were fabricated by sediment co-deposition (SCD) from Watt’s type electrolyte containing nano-Al2O3 particles without any additives. For comparison, Ni-Al2O3 nano-composite coatings were prepared by conventional electro-plating (CEP) under experimental conditions. Effects of process parameters, such as nano-Al2O3 concentration in plating solution, current density, stirring rate, and bath temperature, on nano-Al2O3 content in composite coatings were investigated. The distribution of elements in deposit, and the bonding strength between coating and substrate was analyzed by electron probe microanalyzer (EPMA) and auto-scratch apparatus, respectively. It is found that the nano-Al2O3 concentration in plating solution, current density and stirring rate are three main factors affecting the particles content in deposit, and played a key role in the formation of composite coatings. The nano-Al2O3 content in composite coatings increased with increasing of nano-Al2O3 concentration in plating solution, current density and stirring rate to reach a maximum value, and then reduced slightly. The contents of nano-Al2O3 particles in composite coatings by the SCD technique were higher than that by the CEP technique. The co-deposited nano-Al2O3 particles embedded uniformly in the Ni matrix. The coating was well adhesion with substrate. It is demonstrated that the SCD technique is an efficient approach for improving the nano-Al2O3 content in Ni-Al2O3 composite coatings.

关键词：共沉积电解质电镀纳米氧化铝

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A promising new class of irradiation tolerant materials:Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy

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Journal of Materials Science & Technology 2019年第3期35卷 369-373页

作者： Yiping Lu Hefei Huang Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang tingju li Key Laboratory of Solidification Control and Digital Preparation Technology (liaoning Province) School of Materials Science and Engineering Dalian University of Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences (CAS) School of Materials Science and Engineering Nanjing University of Science and Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Department of Nuclear Engineering and Radiological Sciences University of Michigan

Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti_2 ZrHfV_(0.5)Mo_(0.2) HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects.

关键词： High-entropy alloy Irradiation resistance Microstructural characterization Defects evolution

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电镀制造单晶铜

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科学通报 2024年第1期69卷 10-11页

作者：李廷举大连理工大学材料科学与工程学院大连116024

金属及合金由于在力、热、电、磁等方面所具有的优异特性,成为人类文明与技术进步的关键材料.通常,冶炼加工获得的金属与合金均为多晶,存在各种取向的晶粒及大量晶界,通过对冶炼及加工工艺的设计优化,可以实现微观结构的调控,进而获得... 详细信息

金属及合金由于在力、热、电、磁等方面所具有的优异特性,成为人类文明与技术进步的关键材料.通常,冶炼加工获得的金属与合金均为多晶,存在各种取向的晶粒及大量晶界,通过对冶炼及加工工艺的设计优化,可以实现微观结构的调控,进而获得能够满足实际应用的理想材料.

关键词：单晶铜冶炼加工微观结构金属与合金关键材料金属及合金理想材料人类文明

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Microstructure and Properties of Multi-component AlxCoCrFeNiTi0.5 High-entropy Alloys

Microstructure and Properties of Multi-component AlxCoCrFeNi...

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中国材料大会2012

作者： Yong Dong Yiping Lu Junjia Zhang tingju li School of Materials Science and Engineering Dalian University of Technology

ISBN: (纸本)9783037856079

The multi-component AlxCoCrFeNiTi0.5 （x=0, 0.2, 0.5, 0.8, 1.0） high-entropy alloys were prepared by vacuum arc melting. The microstructure and mechanical properties were studied. It was found that the structure transformed from FCC into FCC + BCC + Laves, and finally into BCC with the increase of Al content. The compress test results showed that with the addition of aluminium from 0 to 1.0, the fraction strength increased while plasticity reduced. In the stain rates of 5×10-3 /s and 1×10-3 /s, when x=0.8 the fraction strength achieved maximum and x=0 the plastic was best, the strength of 2879MPa and 2433MPa, the strain of 0.21 and 0.22, respectively. The hardness increased obviously （from Hv479.1 to Hv692.7） when Bcc phase and Laves phase appeared. The analysis revealed that the strengthen mechanism was mainly composed of solid solution strengthening and precipitation strengthening.

关键词： Multi-component High-entropy alloys Microstructure Solid solution Fracture strength

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Effect of Electromagnetic Stirring on the Quality of K417 Superalloy Ingots

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航空制造技术 2007年第z1期50卷 389-392页

作者： Jin Wenzhong li tingju Yin Guomao

The effect of electromagnetic stirring on the inner quality of K417 superalloy ingots is studied with EPMA and optical *** results show that while an electromagnetic stirring with 50Hz frequency and 80A current is imposed,the equiax crystals of K417 superalloy ingots can be effectively refined and increased,and the central shrinkage porosity and the dendritic segregation of K417 superalloy ingots are greatly reduced,so the inner quality of K417 superalloy ingots is obviously improved.

关键词： Electromagnetic stirring Superalloy Ingots Quality

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