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Refractory high-entropy alloys:A focused review of preparation methods and properties

Journal of Materials Science & Technology 2023年第11期142卷 196-215页

作者： Wei Xiong Amy X.y.guo Shuai Zhan Chain-Tsuan Liu Shan Cecilia Cao Materials Genome Institute Shanghai UniversityShanghai 200444China Hong Kong Institute of Advanced Study City University of Hong KongKowloonHong KongChina

In recent years,high-entropy alloys(HEAs)have become prominent metallic materials due to their unique design strategies and excellent mechanical *** HEAs-inherent high-entropy,lattice-distortion,sluggish-diffusion,and cocktail effects make HEAs maintain high strength,oxidation resistance,corrosion resistance,wear resistance,and other excellent comprehensive properties,showing stronger competitiveness relative to traditional *** high-entropy alloys(RHEAs)are considered as a new kind of high-temperature materials with great application prospects due to their excellent mechanical properties and have the potential to replace nickel-based superalloy as the next generation of high-temperature *** reviewed the research status and preparation methods of RHEAs in recent years,including the metallurgical smelting,powder metallurgy,magnetron sputtering,and additive manufacturing *** microstructure and phase-transformation process of RHEAs were *** mechan-ical properties and main strengthening and toughening mechanisms of RHEAs,such as solid-solution strengthening,precipitation strengthening,and the transformation-induced plasticity(TRIP),were discussed,and the deformation mechanism of RHEAs was *** properties of RHEAs,including high strength,oxidation resistance,corrosion and wear resistance were *** will meet the huge market demand in the engineering materials field,but there are still many challenges,such as the tradeoff between high strength and high ductility,structural design,and performance optimization of RHEAs with brittle BCC *** believe that this combination of knowledge may shape the future of RHEAs and break through the mutually exclusive conundrum of high strength and high toughness for RHEAs.

关键词： Refractory high-entropy alloy Preparation technology Phase transformation Mechanical properties Strengthening and toughening mechanisms Deformation mechanisms

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STUDy ON PROPERTIES OF PULSE ELECTRODEPOSITED RE-Ni-W-P-SiC COMPOSITE COATINGS

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 111-116页

作者： Z.C. guo X.y. Zhu R.D. Xu Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China

The effects of pulse frequency f and duty cycle r on the deposition rate, composition, morphology, and hardness of pulse electrodeposited RE （rare earth）-Ni-W-P-SiC composite coatings have been studied. The results indicate that pulse current can improve the deposition rate of RE-Ni-W-P-SiC composite coatings; W, P, and SiC contents in the coating decrease with the increase of pulse frequency and reach the lowest value at f = 33Hz, whereas the RE content in the composite coatings increases with the increase of pulse frequency. SiC content decreases with the increase of duty cycle, W content reaches the lowest value, and P content reaches the highest value at r = 0.4; pulse current and RE can lead to smaller size of the crystalline grains; however, the effects of different pulse frequency and duty cycle on the morphologies of RE-Ni-W-P-SiC composite coatings are not obvious. The hardness of RE-Ni-W-P-SiC composite coatings is the highest when the duty cycle is at 0.6 and 0.8 and pulse frequency is at 50Hz. At the same pulse frequency, the hardness of RE-Ni-W-P-SiC composite coatings at r= 0.8 is higher than that at r= 0.6.

关键词： frequency duty cycle electrodeposition RE-Ni-W-P-SiC composite coating

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Influence of the velocity barrier on the massive Dirac electron transport in a monolayer MoS2 quantum structure

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Frontiers of physics 2020年第3期15卷 113-121页

作者： X.-J.Hao R.-y.yuan J.-J.Jin y.guo Center for Theoretical Physics Department of PhysicsCapital Normal UniversityBeijing100048China Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua UniversityBeijing100084China Collaborative Innovation Center of Quantum Matter BeijingChina

Using the transfer matrix method,spin-and valley-dependent electron transport properties modulated by the velocity barrier were studied in the normal/ferromagnetic/normal monolayer MoS2 quantum *** on Snell’s Law in optics,we define the velocity barrier asξ=v2/v1 by changing the Fermi velocity of the intermediate ferromagnetic region to obtain a deflection condition during the electron transport process in the *** results show that both the magnitude and the direction of spin-and valley-dependent electron polarization can be regulated by the velocity barrier.−100%polarization of spin-and valley-dependent electron can be achieved forξ>1,while 100%polarization can be obtained forξy transport always occur at a large incident *** addition,the spin-and valley-dependent electron transport considerably depends on the length kFL and the gate voltage U(x)of the intermediate ferromagnetic *** findings provide an effective method for designing novel spin and valley electronic devices.

关键词： velocity barrier monolayer MoS2 spin valley polarization

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Relationship of Corrosion Behavior Between Single-Phase Equiatomic CoCrNi,CoCrNiFe,CoCrNiFeMn Alloys and Their Constituents in NaCl Solution

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1574-1584页

作者： D.P.Wang J.W.Shen Z.Chen F.G.Chen P.y.guo y.X.Geng y.X.Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The composition is a significant issue for corrosion resistance of metallic *** reveal the correlation of corrosion behavior between multiprinciple alloys and their constituents,a series of single-phase equiatomic alloys of CoCrNi,CoCrNiFe and CoCrNiFeMn was *** electrochemical and scanning electron microscope results demonstrated that corrosion resistance of the equiatomic alloys in 0.1 M NaCl solution is located in the range but not the average value of their constituents.X-ray photoelectron spectroscopy analysis indicated that the protective performance of passive film is mainly determined by the constituent with the highest corrosion resistance and the breakdown of passive film is mainly dominated by the elements with the highest corrosion *** findings can guide the materials design of multiprinciple alloys with expected corrosion performance.

关键词： High-entropy alloy Corrosion Constituent X-ray photoelectron spectroscopy(XPS) Passive films

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CPFD simulation on particle behaviour in an entrained-flow gasifier

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Clean Energy 2020年第1期4卷 75-84页

作者： yongshi Liang Cliff y.guo Xianglong Zhao Qiang Qin yi Cheng Lixin He National Institute of Clean-and-low-carbon Energy Beijing 102211China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

A computational particle fluid dynamics simulation model for entrained-flow gasification was established in this *** simulation results agree with the experimental *** detailed particle information and residence-time distribution were obtained by injecting particle tracers in the *** results show that the particles in the gasifier can be classified into three flowing zones,i.e.a fast-flowing zone,a recirculation zone and a spreading *** criterion for this classification was also *** rapid gas expansion caused by the fast reactions plays a significant role in forming the particle stream into these three *** accelerates the particles in the centre of the gasifier while pushing the particles near the expansion edge into the gas ***,the concentrated oxygen distribution in the gasifier results in the formation of high-and low-temperature *** particles in the fast-flowing zone flow directly through the high-temperature region and most of these particles in this zone were fully reacted with a short residence *** particles in the recirculation zone are in a relatively low-temperature region,most of these particles are not fully gasified,although with a long residence *** rest of particles in the spreading zone show moderate properties between the above two zones.

关键词： CPFD simulation entrained-flow gasifier particle behaviour gasification process

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Heavy fermions in high magnetic fields

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Chinese Physics B 2019年第1期28卷 25-38页

作者： M Smidman B Shen C y guo L Jiao X Lu H Q yuan Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Heavy fermion materials are prototypical strongly correlated electron systems, where the strong electron–electron interactions lead to a wide range of novel phenomena and emergent phases of matter. Due to the low energy scales, the relative strengths of the Ruderman–Kittel–Kasuya–yosida(RKKy) and Kondo interactions can often be readily tuned by non-thermal control parameters such as pressure, doping, or applied magnetic fields, which can give rise to quantum criticality and unconventional superconductivity. Here we provide a brief overview of research into heavy fermion materials in high magnetic fields, focussing on three main areas. Firstly we review the use of magnetic fields as a tuning parameter,and in particular the ability to realize different varieties of quantum critical behaviors. We then discuss the properties of heavy fermion superconductors in magnetic fields, where experiments in applied fields can reveal the nature of the order parameter, and induce new novel phenomena. Finally we report recent studies of topological Kondo systems, including topological Kondo insulators and Kondo–Weyl semimetals. Here experiments in magnetic fields can be used to probe the topologically non-trivial Fermi surface, as well as related field-induced phenomena such as the chiral anomaly and topological Hall effect.

关键词： heavy fermions high magnetic fields quantum phase transitions heavy fermion superconductivity topological Kondo systems

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Biomedical applications of the powder-based 3D printed titanium alloys:A review

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Journal of Materials Science & Technology 2022年第30期125卷 252-264页

作者： Amy X.y.guo Liangjie Cheng Shuai Zhan Shouyang Zhang Wei Xiong Zihan Wang Gang Wang Shan Cecilia Cao Materials Genome Institute Shanghai UniversityShanghai 200444China

3D printing technology is a new type of precision forming technology and the core technology of the third industrial *** powder-based 3D printing technology of titanium and its alloys have received great attention in biomedical applications since its advantages of custom manufacturing,costsaving,time-saving,and resource-saving *** particular,the personalized customization of 3D printing can meet specific needs and achieve precise control of micro-organization and structural *** purpose of this review is to present the most advanced multi-material 3D printing methods for titanium-based *** first reviewed the bone tissue engineering,the application of titanium alloy as bone substitutes and the development of manufacturing technology,which emphasized the advantages of 3D printing technology over traditional manufacturing *** is more,the optimization design of the hierarchical structure was analyzed to achieve the best mechanical properties,and the biocompatibility and osseointegration ability of the porous titanium alloy after implantation in living bodies was ***,we emphasized the development of digital tools such as artificial intelligence,which provides new ideas for the rational selection of processing *** 3D printing titanium-based alloys will meet the huge market demand in the biomedical field,but there are still many challenges,such as the trade-off between high strength and low modulus,optimization of process parameters and structural *** believe that the combination of mechanical models,machine learning,and metallurgical knowledge may shape the future of metal printing.

关键词： The powder-based 3D printing technology Ti-based alloys Biomedical applications Artificial intelligence

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The Synthesis of a Novel Lignan

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Chinese Chemical Letters 2000年第11期11卷 971-974页

作者： Qi X.X. Chang J.B. guo R.y. Chen R.F. Chem. Dept. of Zhengzhou Univeristy Zhengzhou 450052 China Henan Institute of Chemistry Henan Academy Sciences Zhengzhou 450002 China

A short convenient synthesis of a novel lignan, 2-(3′,4′,5′-trimethyoxyphenyl)-1,3-dimethyl-6,7,8-trimethoxy- naphthalene has been accomplished by the condensation of key intermediates, 3,4,5-trimethoxybenzyl methy... 详细信息

关键词： UV KBr IR The Synthesis of a Novel Lignan EtOH

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Molecular　Dynamics　Simulation　on　Thermodynamic　Properties　and　Transport　Coefficients

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Journal of Thermal Science 1996年第3期5卷 196-200页

作者： D.X. Xiong y.S. Xu, Z.y. guo (Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China) Department of Engineering Mechanics Tsinghua University Beijing China

Molecular dynamics simulation (MDS) is used to study the thermodynamic properties and transport coefficients of an argon system with Lennend-Jones potential. The results on the velocity distribution,mean free path, mean collision time, specific heat and self-diffusion coefficient agree well with the existing theoretical/ experimental data. It shows that molecular dynamics method is another bridge to connect microworld and macroworld.

关键词： molecular dynamics simulation thermodynamic property transport coefficient

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QUANTITATIVE CHARACTERIZATION OF STRESS-STRAIN HySTERESIS LOOPS OF Cu-Zn-Al SHAPE MEMORy ALLOy

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 97-102页

作者： y.F. guo, y.Z. Huo, C.T. Zeng, X.T. Zu (Department of Metal Materials, Sichuan University, Chengdu 610065, China) (Department of Physics, Sichuan University, Chengdu 610064, China) Dept. of Metal Mat. Sichuan Univ. Chengdu 610065 China

A six-parameter mathematical model was introduced to simulate the stress-strain hysteresis and the sinner hysteresis of polycrystalline shape memory alloys (SMAs). By the comparison with experiments of Cu-Zn-Al SMA, it was shown that the model could be used to calculate the stress-strain relations with rather good accuracy. Moreover, it was found that the six parameters introduced in this paper represented the characteristics of the stress-strain hysteresis of polycrystalline SMAs and could be used to characterize the hysteresis quantitatively.

关键词： Characterization Hysteresis Shape memory effect Strain Stresses Zinc alloys

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