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Extreme Responses of An Integrated System with A Semi-Submersible Wind Turbine and Four Torus-Shaped Wave Energy Converters in Different Survival Modes

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China Ocean engineering 2024年第5期38卷 877-892页

作者： WANG Kai LI Yu-meng ONG Muk Chen WAN Ling LI Liang-bi CHENG Zhengshun School of Ocean Engineering and Technology Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4036Norway Faculty of Maritime and Transportation Ningbo UniversityNingbo 315211China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China SJTU Yazhou Bay Institute of Deepsea Science and Technology Sanya 572024China

Offshore wind power is a kind of important clean renewable energy and has attracted increasing attention due to the rapid consumption of non-renewable *** reduce the high cost of energy,a possible try is to utilize the combination of wind and wave energy considering their natural correlation.A combined concept consisting of a semi-submersible wind turbine and four torus-shaped wave energy converters was proposed and numerically studied under normal operating ***,the dynamic behavior of the integrated system under extreme sea conditions has not been studied *** the present work,extreme responses of the integrated system under two different survival modes are *** coupled time-domain simulations with consideration of interactions between the semi-submersible wind turbine and the torus-shaped wave energy converters are performed to investigate dynamic responses of the integrated system,including mooring tensions,tower bending moments,end stop forces,and contact forces at the Column-Torus *** is found that the addition of four tori will reduce the mean motions of the yaw,pitch and *** the tori are locked at the still water line,the whole integrated system is more suitable for the survival modes.

关键词： combined wind and wave energy concept wave energy converter survival mode extreme response

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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

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3D printing of fine-grained aluminum alloys through extrusion-based additive manufacturing:Microstructure and property characterization

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Journal of materials science & Technology 2023年第8期139卷 126-136页

作者： Fengchao Liu Pingsha Dong Abdul Sayeed Khan Yuning Zhang Randy Cheng Alan Taub Zongyi Ma Department of Naval Architecture and Marine Engineering University of MichiganAnn ArborMI 48109USA Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical Engineering University of MichiganAnn ArborMI 48109USA Department of Materials Science and Engineering University of MichiganAnn ArborMI 48109USA

Additive manufacturing(AM)has the potential to transform manufacturing by enabling previously un-thinkable products,digital inventory and delivery,and distributed *** we presented an extrusion-based metal AM method(refer to“SoftTouch”depositionin thefiledpatent)thatis suitablefor making the metal feedstock flowable prior to the deposition through dynamic recrystallization induced grain refinement at elevated *** flowable metal was extruded out of the printer head like a paste for building dense metal parts with fine equiaxed grains and wrought mechanical ***-the-shelf metal rods were used as feedstock and the printing process was completed in an open-air environment,avoiding pricy powders and costly inert or vacuum *** resulting multi-layer de-posited 6061 aluminum alloys yield strength and ductility comparable to wrought 6061 aluminum alloys after the same T6 heat *** extrusion-based metal AM method can also be advanced as green manufacturing technologies for fabricating novel alloys and composites,adding novel features to existing parts,repairing damaged metal parts,and welding advanced metals for supporting sustainable manufac-turing,in addition to being developed into a cost-effective manufacturing process for the fabrication of dense metal of complex structural forms.

关键词： Additive friction extrusion deposition Microstructure refinement Solid state additive manufacturing Additive friction stir deposition Friction stir welding

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Mg-3Al-1Zn alloy deformed along different strain paths: Role of latent hardening

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Journal of Magnesium and Alloys 2023年第2期11卷 522-532页

作者： Yao Cheng Adrien Chapuis Yunchang Xin Qing Liu Peidong Wu College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Department of Mechanical Engineering McMaster UniversityHamiltonOntario L8S 4L7Canada

The mechanical properties of magnesium alloy AZ31 were investigated experimentally with visco-plastic self-consistent modeling. Tension,compression and plane strain compression(PSC) tests were performed along 3 directions of a hot rolled plate, and the material parameters input in the model were fitted with the uniaxial stress-strain curves. The critical resolved shear stress(CRSS) for tension twinning was modeled with a modified Voce hardening law first decreasing, and then increasing with strain, that could reproduce better the flow stress for twin-predominant deformation. Such CRSS evolution may better model twin nucleation, propagation and growth. Firstly simulations were carried out assuming latent hardening coefficients for slip by other slip systems equal to self-hardening. Then different heterogeneous latent hardening were used, whose values were based on dislocation dynamics simulations from the literature. This study shows that equal self and latent hardening can reproduce the stress strain curves and plastic anisotropy as well as heterogeneous mode on mode latent *** between simulations and experimental results from PSC are explained by an under-estimation of twinning for some PSC strain paths.

关键词： Crystal plasticity Mg alloy mechanical properties Latent hardening

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Impact of austenite nanograins induced by sliding friction on interfacial strength during ultrasonic welding

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science and Technology of Welding and Joining 2024年第1期29卷 3-11页

作者： Chu, Hue-En Sun, Yi-Hsuan Chen, Tai-Cheng Yen, Hung-Wei Lin, Jhe-Yu Department of Mechanical Engineering National Taipei University of Technology Taipei Taiwan Department of Materials Science and Engineering National Taiwan University Taipei Taiwan Nuclear Fuels and Materials Division Institute of Nuclear Energy Research Taoyuan Taiwan

This study investigated the effect of nanograin formation on joint strength through sliding friction during ultrasonic welding (USW). The nanograined austenite phase would induce the surface strengthening effect, potentially impeding the bonding process. A bonding strength exceeded 2000 N within a short welding duration of 2.5 s. Interestingly, the strength was attributed to ultrafine-grained interfacial microstructure resulting from the plastic flow during processing. This unique nanograined microstructure formed from dynamic recrystallisation unexpectedly facilitated the bond formation rather than hindering the bonding process. This study gained insights into the critical interfacial microstructure required for the USW of metals and alloys with high melting temperatures. © The Author(s) 2024.

关键词： dynamic recrystallisation grain refinement nanograins stainless steels ultrasonic welding

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mechanical and Corrosion Behavior of a Biomedical Mg–6Zn–0.5Zr Alloy Containing a Large Number of Twins

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 439-455页

作者： Chang‑Jian Yan Bo Guan Yun‑Chang Xin Ling‑Yu Zhao Guang‑Jie Huang Rui Hong Xiao‑Bo Chen Paul K.Chu Institute of Corrosion Science and Technology Guangdong 510070China International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Key Laboratory for Light‑Weight Materials Nanjing Tech UniversityNanjing 210009China School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China School of Engineering RMIT UniversityCarlton 3053VICAustralia Department of Physics Department of Materials Science&EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The strong texture of Mg alloys can lead to strong tension–compression yield asymmetry and corrosion anisotropy,and this will consequently affect the effectiveness of hard tissue implants.A biomedical Mg–6Zn–0.5Zr alloy containing a large number of{1012}primary twins and{1012}–{1012}secondary twins is successfully prepared by cross *** dual twin structure not only removes the tension–compression yield asymmetry completely,but effectively reduces the corrosion anisotropy without compromise of corrosion *** difference between the largest corrosion rate and smallest one is~1.2 times compared to~1.6 times of the original *** is found that the reduced corrosion anisotropy is related to re-distribution of crystallographic orientations by twins.

关键词： Biomedical Mg alloy Corrosion mechanical anisotropy Texture Twins

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Quantification and visualization of spatial distribution of dendrites in solid polymer electrolytes

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escience 2024年第1期4卷 114-122页

作者： Tiancheng Yi Enyue Zhao Yuping He Tianjiao Liang Howard Wang Spallation Neutron Source Science Center Dongguan 523803China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Neutron Science Platform Songshan Lake Materials LaboratoryDongguan 523808China Institute for Materials Research and Department of Mechanical Engineering Binghamton UniversityBinghamtonNY 13902USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA

Integrating lithium metal anodes with polymer electrolytes is a promising technology for the next generation high-energy-density rechargeable *** the progress is often hindered by the dendrite growth upon cycling,quantifying three-dimensional(3D)microstructures of dendrites in polymer electrolytes is essential to better understanding of dendrite formation for the development of mitigation *** for 3D quantification and visualization of dendrites,especially those with low Li contents,are rather *** study reports quantitative measurements of the spatial distribution of Li dendrites grown in solid polymer electrolytes using 3D tomographic neutron depth profiling(NDP)with improved spatial resolution,compositional range,and data *** reveal heterogeneous distribution of Li over length scales from tens nanometers to *** most dendrites grow from the plating toward the stripping electrode with dwindling Li quantities,dendrites apparently grown from the Li-stripping electrode are also *** discovery is only possibly due to the unique combination of the high specificity and high sensitivity of the neutron activation analysis of Li isotope.

关键词： Li metal battery Solid polymer electrolytes 3D tomographic neutron depth profiling Lithium dendrite

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Dual modifications of sensitizers and lanthanide ions on a two-dimensional zirconium-based metal-organic framework for photoluminescent detection

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CrystEngComm 2024年第22期26卷 2852-2861页

作者： Chang, Jhe-Wei Lin, Tzu-Chi Chen, You-Liang Han, Po-Chun Yang, Shang-Cheng Tsai, Meng-Dian Wu, Kevin C.-W. Kung, Chung-Wei Department of Chemical Engineering National Cheng Kung University Tainan City70101 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Ph. D. Program of Green Materials and Precision Devices College of Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan320 Taiwan

A two-dimensional (2D) zirconium-based metal-organic framework (Zr-MOF) with abundant terminal -OH/-OH2 groups on its nodes, ZrBTB (BTB = 1,3,5-tris(4-carboxyphenyl)benzene), is utilized as a platform for dual post-synthetic modifications (PSM) to immobilize both the benzophenone-based photosensitizer (benzophenone-4,4′-dicarboxylate, bzpdc) and terbium ions onto the 2D Zr-MOF molecular sheets. Terbium ions are installed on the 2D Zr-MOF at various temperatures to adjust the loading of terbium ions on the 2D Zr-MOF while preserving the loading of the photosensitizer. The crystallinity, morphology, porosity, and loadings of both bzpdc ligands and terbium ions are characterized for each material, and the coordinating locations of terbium ions in the Zr-MOF structure are investigated. The photoluminescence (PL) properties of these materials are then examined. Since the installed bzpdc ligand can induce a highly efficient energy transfer to the neighbouring terbium ion upon excitation, the obtained material after dual PSM (ZrBTB-bzpdc-Tb-120) can show strong PL emissions of terbium ions upon the excitation of the bzpdc ligand at 355 nm, with a PL quantum yield of 5.04%. It is more advantageous than the 2D Zr-MOF solely functionalized with terbium ions, which can only exhibit similar emissions upon the excitation of the BTB linker at a less friendly wavelength of 310 nm, with a lower PL quantum yield of 2.94%. Owing to the high chemical stability as well as good dispersity of the luminescent ZrBTB-bzpdc-Tb-120 in water, its performances in selective PL sensing of Fe(iii) ions present in aqueous solutions are investigated. © 2024 The Royal Society of Chemistry.

关键词： Carboxylation

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Corrosion behavior of severely plastically deformed Mg and Mg alloys

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Journal of Magnesium and Alloys 2022年第10期10卷 2607-2648页

作者： Ahmad Bahmani Mehrab Lotfpour Milad Taghizadeh Woo-Jin Kim Department of Advanced Materials and Renewable Energy Iranian Research Organization for Science and TechnologyTehran ***Iran Department of Mechanical Engineering University of NevadaRenoNV 89557USA Department of Mechanical Engineering Clemson UniversityClemsonSC 29634USA Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

Magnesium(Mg)alloys have several advantages,such as low density,high specific strength and ***,they also suffer weak points,such as high corrosion,low formability and easy ignition,which makes their applications *** studies have been conducted to overcome these disadvantages and further improve the advantages of Mg *** plastic deformation(SPD)is one of the most important techniques and has great effects on the microstructure refinement of Mg alloys and improvements in their strength and *** researchers have studied the corrosion behavior of SPD-processed Mg alloys in recent ***,these studies have reported some controversial effects of SPD on the corrosion of Mg alloys,which makes the research roadmap ***,it is important to review the literature related to the corrosion properties of Mg alloys prepared by SPD and understand the mechanisms controlling their corrosion *** grain refinement by SPD improves the corrosion properties of pure Mg and Mg alloys,but control of the processing conditions is a key factor for achieving this goal because texture,dislocation density,size and morphology of secondary phase also importantly affects the corrosion properties of Mg *** grain size in the fine grain-size range can decrease the corrosion rate due to the increased barrier effect of grain boundaries against corrosion and the formation of a stable passivation layer on the surface of fine *** texture reduces the corrosion rate because basal planes with the highest atomic planar density are more corrosion resistant than other *** dislocation density after SPD deteriorates the corrosion resistance of the interior grains and thus proper annealing after SPD is *** fine and uniform distribution of secondary phase particles during SPD is important to minimize the micro-galvanic corrosion effect and retain small grains during annealing treatment f

关键词： Magnesium alloys Corrosion Severe plastic deformation Grain size Secondary phase Dislocation density

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Innovation in thermal cycling aging compared to isothermal aging for precipitation hardening stainless steel

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Journal of materials Research and Technology 2023年 27卷 3799-3808页

作者： Hsu, Cheng-An Chiu, Po-Han Chang, Hong-Yi Wang, Shing-Hoa Tsao, Tzu-Ching Yang, Jer-Ren Lee, Yuan-Tzu Department of Mechanical and Mechatronic Engineering National Taiwan Ocean University Keelung202301 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei106319 Taiwan Department of Marine Engineering National Taiwan Ocean University Keelung202301 Taiwan

The cyclic thermal process can assist and accelerate the kinetics of phase transformation. Conventional UNS S17400 grade stainless is characterized by a martensitic microstructure. After solution treatment, the steel was aged by thermal cycling between 600 °C and 25 °C and quenched in water in each cycle, completing under the self-designed system. The nano precipitates of very fine copper particles and larger NbC particles were found by using transmission electron microscopy (TEM). The fraction and quantity of high angle grain boundaries (HAGBs) after 36 cycles were the highest among the three numbers of thermal cycles. The peak hardness also occurred after 36 cycles and was attributed to the finest grains, high fraction of HAGBs, and the largest local microstrain. The microtwins and the reverted γ were formed by the thermal cycling process. The estimated fraction value of reverted γ was very low, below 0.1, with a calculated precipitation rate about 12.6 s−1 at t0.5. © 2023 The Authors

关键词： Thermal cycling

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