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Ultrahigh-strength steels strengthened by nanoparticles

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Science Bulletin 2017年第15期62卷 1043-1044页

作者： Zengbao Jiao chain-tsuan liu Department of Mechanical Engineering The Hong Kong Polytechnic University Center for Advanced Structural Materials College of Science and Engineering City University of Hong Kong

Ultrahigh-strength steels are highly desirable for a wide range of engineering *** them,maraging steels represent an important class of high-alloyed and almost carbon-free ultrahigh-strength steels,the hardening of wh... 详细信息

关键词：超高强度钢纳米颗粒增强马氏体时效钢金属纳米粒子无碳合金

Critical Shear Offset of Fracture in a Zr-based Metallic Glass

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Journal of Iron and Steel Research International 2016年第1期23卷 53-56页

作者： Zhi-yuan liu Yong YANG chain-tsuan liu Shenzhen Key Laboratory of Advanced Manufacturing Technology for Mold & Die Department of Mechanical and Electronic EngineeringShenzhen University Centre for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCollege of CSECity University of Hong Kong

The nanoscale shear band operation process of Zr_（55）Pd_（10）Cu_（20）Ni_5Al_（10） metallic glass（MG）was reined in by constant force during well-designed loading-holding-unloading cyclic microcompression *** the test,it is revealed that the whole shear banding process involves three stages：shear band initiation,shear sliding and shear band *** on the energy balance principle,the size-affected speed of shear sliding is *** energy originated from the shear sliding leads to heat-up of the shear plane;therefore,the temperature in shear band increases with the size of shear offset caused by the energy accumulation during shear *** the glass transition temperature as the critical temperature of fracture for the Zr-based MG,the critical shear offset is predicted to be approximately 190μm,fully in line with the experimental *** directly proved that the fracture of the MG is caused by the temperature rise during shear sliding.

关键词： metallic glass shear band fracture temperature rise

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

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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

Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 689-696页

作者： Dongpeng Wang Guang Chen Anding Wang Yuxin Wang Yanxin Qiao Zhenguang liu Zhixiang Qi chain tsuan liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

Fast secondary relaxation and plasticity initiation in metallic glasses

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National Science Review 2018年第5期5卷 616-618页

作者： Ji Chao Qiao Xiao Di liu Qing Wang chain tsuan liu Jian Lu Yong Yang School of Mechanics and Civil & Architecture Northwestern Polytechnic University Centre for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCity University of Hong Kong Laboratory for Structures Institute of MaterialsShanghai University

Metallic glasses (MGs) are a promising engineering material with superb strength. However, their ‘Achilles’ heel’is their poor ductility in ambient conditions, particularly under tension. Unlike their crystalline c... 详细信息

关键词： MG Fast secondary relaxation and plasticity initiation in metallic glasses

Second phase effect on corrosion of nanostructured Mg-Zn-Ca dual-phase metallic glasses

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Journal of Magnesium and Alloys 2021年第5期9卷 1561-1570页

作者： Chang liu Qing Wang Bin Han Junhua Luan Ji-Jung Kai chain-tsuan liu Ge Wu Jian Lu Department of Mechanical Engineering City University of Hong KongHong KongChina Max-Planck-Institut für Eisenforschung Max-Planck-Straße 1Düsseldorf40237Germany Laboratory for Microstructures Institute of Materials ScienceShanghai UniversityShanghai 200072China Hong Kong Branch of National Precious Metals Material Engineering Research Centre Department of Material Science and EngineeringCity University of Hong KongHong KongChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China CityU-Shenzhen Futian Research Institute Shenzhen 518045China

Dual-phase metallic glasses(DP-MGs),a special member of the MGs family,often reveal unusual strength and ductility,yet,their corrosion behaviors are not ***,we developed a nanostructured Mg_(57)Zn_(36)Ca_(7)(at.%)DP-MG and uncovered its corrosion mechanism in simulated body fluid(SBF)at the near-atomic scale utilizing transmission electron microscope(TEM)and atom probe tomography(APT).The 10-nm-wide Ca-rich amorphous phases allow oxygen propagation into the DP-MG,resulting in a micrometer thick hydroxides/oxides *** dense corrosion layer protects the DP-MG from further corrosion,enabling a corrosion rate that is 77%lower than that of Mg(99.99%purity).

关键词： Magnesium alloys Metallic glass Corrosion Sputtered films TEM APT

D0_(22) precipitates strengthened W-Ta-Fe-Ni refractory high-entropy alloy

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Journal of Materials Science & Technology 2024年第10期177卷 85-95页

作者： Tong Li Jin-Xi Chen Tian-Wei liu Yan Chen Jun-Hua Luan Zeng-Bao Jiao chain-tsuan liu Lan-Hong Dai State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China Inter-University 3D Atom Probe Tomography Unit Department of Materials Science and EngineeringCity University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Refractory high-entropy alloys have recently emerged as promising candidates for high-temperature structural ***,their performance is compromised by the trade-off required between strength and ***,a novel W30Ta5(FeNi)65 refractory high-entropy alloy with an outstanding combination of strength and plasticity at both room and elevated temperatures is designed,based on the multi-phase transitions design *** alloy comprises a body-centered cubic dendrite phase,a topologically close-packed μ rhombohedral phase,and a high-density coherent nano-precipitate γ"phase with the D0_(22)structure(Ni3Ta type)embedded in a continuous face-centered cubic *** to pre-cipitation strengthening of D0_(22),the yield stress of the alloy is determined as high as 1450 MPa,which is a significant improvement(~100%)in comparison with the D0_(22)-free alloy,without a loss of *** alloy exhibits an excellent high-temperature strength,with the yield strengths of 1300 MPa at 600 ℃ and 320 MPa at 1000 ℃.Detailed microstructural characterization using transmission electron mi-croscopy,high-angle annular dark-field imaging,and three-dimensional atom probe tomography analyses indicated that this superior strength-plasticity combination stems from the synergy of a multiple-phase *** results provide a new insight into the design of RHEAs and other advanced alloys.

关键词： Refractory high entropy alloy Multi-phase structure D0_(22)superlattice Precipitation strengthening

Development of soft magnetic amorphous alloys with distinctly high Fe content

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 45-50页

作者： PingBo Chen AnDing Wang ChengLiang Zhao AiNa He Gang Wang ChunTao Chang XinMin Wang chain-tsuan liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Laboratory for Mierostructures Institute of Materials Science Shanghai University Shanghai 200444 China Center for Advanced Structural Materials Department of Mechanical and Biomedical Engineering College of Science and Engineering City University of Hong Kong Hong Kong 999077 China

This paper reports on the preparation of Fe82.7-85.7Si2-4.9B9.2-11.2P1.***.2.7C0,8 soft magnetic amorphous alloys with a distinctly high Fe content of 93.5-95.5 wt.% by component design and composition adjustment. All alloys can be readily fabricated into completely amorphous ribbon samples with good surface quality by the single copper roller melt-spinning method. These alloys show good bending ductility and excellent magnetic properties after annealing, i.e., low coercivity （He） of 3.3-5.9 A/m, high permeability （μe） of 5000-10000 and high flux saturation density （Bs） of 1.63-1.66 T. The mechanism of the good glass forming ability （GFA）and soft-magnetic properties are explored. The amorphous alloys with the high Fe content comparable to that of the desired high Si alloy can be promising candidates for the potential application in electric devices.

关键词： metallic glasses alloy design annealing magnetic properties shear band

Asynchronous responses of mechanical and magnetic properties to structure relaxation for FeNbB bulk metallic glass

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Journal of Iron and Steel Research International 2018年第6期25卷 637-643页

作者： Zhi-kai Gao An-ding Wang Ping-bo Chen Cheng-liang Zhao Fu-shan Li Ai-na He Chun-tao Chang Xin-min Wang chain-tsuan liu School of Materials Science and Engineering ZhengzhouUniversity Zhengzhou 450001 Henan China Key Laboratory of Magnetic Materials and Devices NingboInstitute of Materials Technology and Engineering ChineseAcademy of Sciences Ningbo 315201 Zhejiang China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of MaterialsTechnology and Engineering Chinese Academy of SciencesNingbo 315201 Zhejiang China Center for Advanced Structural Materials Department ofMechanical and Biomedical Engineering College of Scienceand Engineering City University of Hong Kong Hong KongChina

Asynchronous responses of mechanical and magnetic properties to structure relaxation for the Fe71Nb6B23 bulk metallic glass were systematically investigated. It is interesting that this ternary alloy can combinedly exhibit outstanding magnetic and mechanical properties, especially good ductility, after optimally annealing in structure relaxation stage for eliminating the internal stress and homogenizing the microstructure. The alloy exhibits low coercive force of 1.6 A/m, high effective permeability of 15 x 10^3, high fracture strength of 4.2 GPa and good plastic strAln of 1.8%. It is also found that responses of mechanical and magnetic properties to structure relaxation are asynchronous. The glass transition and crystallization will greatly deteriorate the magnetic and mechanical properties. Here we propose a physical picture and demonstrate that the primary structure factors determining magnetic and mechanical properties are different. This work will bring a promising material for application and a new perspective to study the effect of annealing-induced structure relaxation on mechanical and magnetic properties.

关键词： Bulk metallic glass Annealing Mechanical property Magnetic property Structure relaxation