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Pencil painting like preparation for flexible thermoelectric material of high-performance p-type Na_(1.4)Co_(2)O_(4) and novel n-type NaxCo_(2)O_(4)

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Journal of Materiomics 2021年第5期7卷 1153-1160页

作者： Zhen Tian Jun Wang Xinba Yaer Hui-Jun Kang Xiao-Huan Wang Hui-Min Liu De-zhi Yang Tong-Min Wang School of Materials Science and Engineering Inner Mongolia University of TechnologyNo.49 Aimin StreetXincheng DistrictHohhotInner Mongolia Autonomous Region010051China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China International Mongolian Hospital HohhotInner Mongolia Autonomous Region010065China

Flexible thermoelectric materials are presented with potential applications in electronic devices and energy conversion due to their convenient preparation,good flexibility,and various ***,as ductility is rarely observed in inorganic semiconductors and ceramic insulators,reports on applications of inorganic oxide materials in flexible thermoelectric materials are ***,we report a new method for the synthesis of a flexible Na_(1.4)Co_(2)O_(4) thermoelectric material based on Na_(1.4)Co_(2)O_(4) bulk materials,which are prepared by a self-flux method and painted on print *** coefficient and power factor of the obtained thermoelectric material are 78-102 μVK^(-1) and 159e223 mWm^-(1)K^(-2),respectively,in a temperature range of 303-522 K,which are superior to those values of other conductive polymers and their *** interestingly,the n-type Na_(1.4)Co_(2)O_(4) flexible material is obtained in the painting process at higher pressure with Seebeck coefficients of109 to183 μVK^(-1) in a temperature range of 303-522 *** convenient preparation method of these novel flexible thermoelectric materials may be expanded to the synthesis of other flexible thermoelectric materials,which will be the focus of future work.

关键词： Na_(1.4)Co_(2)O_(4) Flexible thermoelectric material Print paper Layered oxide n-type Na_(1.4)Co_(2)O_(4)

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The control of Nbb2 Particles in Al-Nbb2 Master Alloy and its Effect on Grain Refinement of Az91 Magnesium Alloy

SSRN

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SSRN 2022年

作者： Fan, Wenxue Bai, Yu Zuo, Guoliang Hao, Hai Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and Engineering Dalian University of Technology Liaoning Province Dalian116024 China Ningbo Research Institute Dalian University of Technology Ningbo315016 China

Simultaneously enhancing strength and ductility is a critical issue for Mg alloys, which can be achieved by grain refinement. How to improve the effectiveness of grain refiner is another significant issue to be solved in the Mg alloy foundry industry. In this study, new Al-NbB2 master alloys for AZ91 alloy were prepared by the liquid solidification reaction method. The improvement of the refining efficiency of Al-NbB2 master alloy was achieved by changing the cooling rate during the preparation process. The results showed that the newly prepared Al-NbB2 master alloy had a remarkable grain refinement effect, and the decrease of the size of NbB2 particles in master alloy can enhance the refinement efficiency. The matching relationships between NbB2 and α-Mg were characterized with the assistance of the high-resolution transmission electron microscope (HRTEM) and edge-to-edge models (E2EM). There were good matching relationships between NbB2 particle and α-Mg, as [1210] / [1210] in (1010) / (0002) and [1213] / [1010] in (10 10) / (1011), which is the key for grain refinement. The minimum average grain size (AGS, 68 m) of AZ91 alloy obtained by addition of Al-NbB2 master alloy exhibited enhanced tensile properties, i.e. 40%, 43% and 95% respectively higher ultimate strength, yield strength and elongation than AZ91 alloy. This work may provide a new insight for the design of high refining efficiency of grain refiner for Mg alloy. © 2022, The Authors. All rights reserved.

关键词： Grain refinement

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Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Xue-Qian Wang Feng-Qi Zhang Xiao-Ya Cui Bing-Bing Fan Jia-Ming Guo Zhi-Min Guo Rui Huang Wen Huang Xu-Bo Li Meng-Ru Li Yan Ma Zhi-Hua Shen Yong-Gang Sun De-Zhuang Wang Fei-Yang Wang Li-Qiang Wang Nan Wang Tian-Li Wang Wei Wang Xiao-Yang Wang Yi-Han Wang Fu-Jie Yu Yu-Zhen Yin Ling-Kun Zhang Yi Zhang Jian-Yang Zhang Qi Zhao Yu-Ping Zhao Xin-Dong Zhu Yasir Sohail Ya-Nan Chen Tao Feng Qi-Long Gao Hai-Yan He Yong-Jiang Huang Zeng-Bao Jiao Hua Ji Yao Jiang Qiang Li Xiao-Ming Li Wei-Bing Liao Huai-Jun Lin Hui Liu Qi Liu Qing-Feng Liu Wei-Di Liu Xiong-Jun Liu Yang Lu Yi-Ping Lu Wen Ma Xue-Fei Miao Jie Pan Qing Wang Hong-Hui Wu Yuan Wu Tao Yang Wei-Ming Yang Qian Yu Jin-Yu Zhang Zhi-Gang Chen Liang Mao Yang Ren Bao-Long Shen Xun-Li Wang Zhe Jia He Zhu Zhen-Duo Wu Si Lan School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Department of Physics City University of Hong KongHongKong 999077China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 100872China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China School of Physical Sciences Great Bay UniversityDongguan 523000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Beijing Advanced Innovation Center for Materials Genome Engineering Research Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Computing Macquarie UniversitySydney 2113Australia Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laborato

Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse ***,the recent advances in the field are comprehensively reviewed,organized into five *** first section introduces the background of HEAs,covering their definition,significance,application prospects,basic properties,design principles,and *** subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory *** the following section,the emphasis shifts to functional materials,exploring HEAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for ***,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption *** paper concludes with an outlook,discussing future directions and potential growth areas in the *** this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： High entropy alloys Cutting-edge structural materials Cutting-edgefunctional materials

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Faceted Kurdjumov-Sachs interface-induced slip continuity in the eutectic high-entropy alloy,AlCoCrFeNi_(2.1)

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Journal of Materials Science & technology 2021年第6期65卷 216-227页

作者： Ting Xiong Wenfan Yang Shijian Zheng Zhaorui Liu Yiping Lu Ruifeng Zhang Yangtao Zhou Xiaohong Shao Bo Zhang Jun Wang Fuxing Yin Peter K.Liaw Xiuliang Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Material Science and Engineering.University of Science and Technology of China Hefei 230026China Tianjin Key Laboratory of Materials Lamninating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Center for Integrated Computational Materials Engineering(International Research Institute for Multidisciplinary Science)and Key Laboratory of High-Temperature Structural Materials 8 Coatings Technology(Ministry of Industry and Informnation Technology) Beihang UniversityBeijing 100191China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072.China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Recently,the eutectic high-entropy alloy(EHEA),AlCoCrFeNi_(2.1),can reach a good balance of strength and *** dual-phase alloy exhibits a eutectic lamellar microstructure with large numbers of ***,the role of the interfaces in plastic deformation have not been revealed *** the present work,the orientation relationship(OR)of the interfaces has been clarified as the Kurdjumov-Sachs(KS)interfaces presenting〈111〉_(B2) 〈110〉_(FCC)and {110} _(B2){111}_(FCC) independent of their *** exist three kinds of interfaces in the EHEA,namely,The dominating interface and the secondary interface are both non-slip planes and atomistic-scale faceted,facilitating the nucleation and slip transmission of the *** formation mechanism of the preferred interfaces is revealed using the atomistic geometrical analysis according to the criteria of the low interfacial energy based on the coincidence-site lattice(CSL)*** particular,the ductility of the dual-phase alloy originates from the KS interface-induced slip continuity across interfaces,which provides a high slip-transfer geometric ***,the strengthening effect can be attributed to the interface resistance for the dislocation transmission due to the mismatches of the moduli and lattice parameters at the interfaces.

关键词： High-entropy alloy AICoCrFeNi_(2.1) Interface Kurdjumov-Sachs(KS) Dislocation

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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

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Novel as-cast AlCrFe2Ni2Ti0.5 high-entropy alloy with excellent mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1312-1317页

作者： Cheng-bin Wei Xing-hao Du Yi-ping Lu Hui Jiang Ting-ju Li Tong-min Wang 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 Shenyang Aerospace UniversityShenyang 110136China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

We designed a novel Co-free AlCrFe2Ni2Ti0.5 high-entropy alloy(HEA)that features an excellent combination of strength and ductility in this *** as-cast AlCrFe2Ni2Ti0.5 alloy showed equiaxed grains undergoing spinodal decomposition,which consisted of ultrafine-grained laminated body-centered cubic(bcc)phases and an ordered body-centered cubic(b2)phase,and some precipitates embedded in the b2 *** bcc and b2 phases also feature a coherent *** unique structure impedes mobile dislocations and hinders the formation of cracks,thereby giving the AlCrFe2Ni2Ti0.5 HEA both high strength and *** room temperature,the as-cast AlCrFe2Ni2Ti0.5 alloy exhibited a compressive yield strength of 1714 MPa,an ultimate strength of 3307 MPa,and an elongation of 43%.These mechanical properties are superior to those of most reported HEAs.

关键词： high-entropy alloys mechanical properties coherent interface spinodal structure

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Microstructure and mechanical properties of AZ91 magnesium alloy with minor additions of Sm, Si and Ca elements

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China Foundry 2019年第5期16卷 319-325页

作者： Redeemina Comfort Bonnah Yu Fu Hai Hao Key Laboratory of Solidification Control and Digital Preparation Technology School of Materials Science and Engineering Dalian University of Technology

The effects of Sm, Si and Ca on the microstructure and mechanical property of AZ91 magnesium alloy were investigated by means of optical microscopy (OM), differential scanning calorimetry (DSC), scanning electronic microscopy (SEM), X-ray diffraction (XRD) and tensile testing. The results indicated that the addition of 1.5 wt.% Sm with or without 0.8 Si/Ca led to a decrease in the volume fraction of the β-Mg17Al12 phase and the formation of the intermetallic compounds of Al-Sm, Mg2Si, MgAlCa and Al2Ca. The microstructure of AZ91 alloy was significantly refined and distribution became discrete with additions of Sm and Ca;the average grain size of the α-Mg matrix was reduced from 239.7 ± 16.9 μm to 66.34 ± 5.10 μm. The AZ91-Sm-Ca alloy exhibited a good combination of yield strength at 135 MPa, ultimate tensile strength at 199 MPa and elongation at 4.32%, which was ascribed to grain refinement strengthening. Furthermore, the T6 treated AZ91-Sm-Ca alloy possessed yield strength of 154 MPa and elongation of 7.1%, which was due to grain refinement strengthening and reduction in discontinuous precipitates.

关键词： AZ91 Sm Ca/Si grain refinement mechanical properties

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Microstructures and Mechanical Properties of Multi-component AlxCrFe2Ni2Mo0.2 High-Entropy Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1135-1144页

作者： Qiuxin Nie Hui Liang Dongxu Qiao Zhaoxin Qi Zhiqiang Cao Key Laboratory of Solidifi cation 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

A series of AlxCrFe2 Ni2 Mo0.2 alloy consisting of FCC+BCC phases have been designed,and their as-cast microstructures and mechanical properties were also investigated with x ranging from 0.6 to *** was found that with the addition of Al element,the solidified structures changed from dendrite to columnar crystal then back to dendrite ***,the increased amount of BCC phase resulted in finer and more uniform microstructures of FCC[FeCrNi(Mo)]and BCC(Al-Ni)*** yield strength and hardness of alloys showed a similar increasing trend as the volume fraction of BCC phase *** strain hardening rate and strain hardening exponent were calculated to assess the tensile properties of the *** was shown that A10.6CrFe2 Ni2 Mo0.2 exhibited the most excellent and comprehensive mechanical properties due to its high work hardening ability and stable strain hardening *** product of strength and elongation of Al0.6CrFe2 Ni2 Mo0.2reached up to 38.6 GPa%,which was higher than most of the reported as-cast high-entropy alloys.

关键词： High-entropy alloys Mechanical properties Microstructures Strain hardening

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Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Effcient Electrocatalysis for Oxygen Evolution Reactions

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Nano-Micro Letters 2020年第4期12卷 41-52页

作者： Guangyuan Yan Yizhan Wang Ziyi Zhang Yutao Dong Jingyu Wang Corey Carlos Pu Zhang Zhiqiang Cao Yanchao Mao Xudong Wang Department of Material Sciences and Engineering University of Wisconsin-MadisonMadisonWI 53706USA Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024People’s Republic of China MOE Key Laboratory of Materials Physics School of PhysicsZhengzhou UniversityZhengzhou 450001People’s Republic of China

Electrochemical catalysts for oxygen evolution reaction are a critical component for many renewable energy applications. To improve their catalytic kinetics and mass activity are essential for sustainable industrial applications. Here, we report a rare-earth metal-based oxide electrocatalyst comprised of ultrathin amorphous La2O3 nanosheets hybridized with uniform La2O3 nanoparticles(La2O3@NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La2O3@NP-NS exhibits excellent catalytic kinetics with an overpotential of 310 mV at 10 m A cm^-2, a small Tafel slope of 43.1 mV dec^-1, and electrochemical impedance of 38 Ω. More importantly, due to the ultrasmall thickness, its mass activity, and turnover frequency reach as high as 6666.7 A g^-1 and 5.79 s^-1, respectively, at an overpotential of 310 mV. Such a high mass activity is more than three orders of magnitude higher than benchmark OER electrocatalysts, such as IrO2 and RuO2. This work presents a sustainable approach toward the development of highly e cient electrocatalysts with largely reduced mass loading of precious elements.

关键词： Oxygen evolution reaction Multiphase hybrid Two-dimensional nanomaterials Rare-earth oxides Ionic layer epitaxy

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Annealed microstructure dependent corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy

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Journal of Materials Science & technology 2021年第3期62卷 234-248页

作者： Baoxian Su Liangshun Luo Binbin Wang Yanqing Su Liang Wang Robert O.Ritchie Enyu Guo Ting Li Huimin Yang Haiguang Huang Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering University of CaliforniaBerkeleyCL 94720USA Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science&EngineeringDalian University of TechnologyDalian116024China Department of Materials Science and Engineering Dalian Maritime UniversityDalian 116026China School of Materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan Titanium Industry Co. Ltd.Chuxiong 651209China

Corrosion resistance of titanium(Ti)alloys is closely connected with their microstructure which can be adjusted and controlled via different annealing ***,we systematically investigate the specific effects of annealing on the corrosion performance of Ti-6 Al-3 Nb-2 Zr-1 Mo(Ti80)alloy in 3.5 wt.%NaCl and 5 M HCl solutions,respectively,based on open circuit potential(OCP),potentiodynamic polarization,electrochemical impedance spectroscopy(EIS),static immersion tests and surface *** indicate that increasing annealing tempe rature endows Ti80 alloy with a higher volume fraction ofβphase and finerαphase,which in turn improves its corrosion *** characterization demonstrates thatβphase is more resistant to corrosion thanαphase owing to a higher content of Nb,Mo,and Zr in the former;additionally,the decreased thickness of a phase alleviates segregation of elements to further restrain the micro-galvanic couple effects betweenαandβ***,the influential mechanisms of environmental conditions on corrosion of Ti80 alloy are discussed in *** the formation of a highly compact and stable oxide film on surface,annealed Ti80 alloys exhibit a low corrosion current density(10^(-6)A/cm^(2))and high polarization impedance(10^(6)Ω·cm^(2))in 3.5 wt.%NaCl ***,they suffer severe corrosion in 5 M HCl solution,resulting from the breakdown of native oxide films(the conversion of TiO_(2)to aqueous Ti^(3+)),active dissolution of substrate Ti to aqueous Ti^(3+)and existence of micro-galvanic couple *** findings could provide new insights to designing Ti alloys with high-corrosion resistance through microstructural optimization.

关键词： Titanium alloys Annealing Electrochemical techniques Weight loss Corrosion behavior

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