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Maximizing the scattering of multiwavelength phonons in novel biphasic high-entropy ZrCoSb-based half-Heusler alloys

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Journal of Materiomics 2024年第1期10卷 45-56页

作者： Rongchun Chen Yu Yan Guangshu Li Ruonan Min Huijun Kang Enyu Guo Zongning Chen Xiong Yang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China ningbo institute of dalian university of technology Ningbo315000China

The thermoelectric(TE)performance of p-type ZrCoSb-based half-Heusler(HH)alloys has been improved tremendously in recent years;however,it remains challenging to find suitable n-type ZrCoSb-based HH alloys due to their high lattice thermal conductivity(κ_(L)).In this work,n-type Zr_(1−x)Ta_(x)Co_(1−x)Ni_(x)Sb HH alloys were firstly designed by multisite *** evolution of the Raman peak proved that alloy scattering,phonon softening,anharmonicity,entropy-driven disorder,and precipitates had a combined effect on decreasingκ_(L)by 46.7%compared to that of pristine ***,Hf_(0.75)Zr_(0.25)NiSn_(0.99)Sb_(0.01)was introduced into Zr_(0.88)Ta_(0.12)Co_(0.88)Ni_(0.12)Sb to further suppressκ_(L).Remarkably,the grain size of the biphasic HH alloys was refined by at least one order of magnitude.A biphasic high-entropy HH alloy with y=0.2 exhibited the minimumκ_(L)of∼2.44 W/(m·K)at 923 K,reducing by 67.7%compared to that of ***,(Zr_(0.88)Ta_(0.12)Co_(0.88)Ni_(0.12)Sb)_(0.9)(Hf_(0.75)Zr_(0.25)NiSn_(0.99)Sb_(0.01))_(0.1)exhibited the highest TE figure of merit(∼0.38)at 923 *** cooperation between the entropy and biphasic microstructure resulted in multiscale defects,refined grains,and biphasic interfaces,which maximized the scattering of the multiwavelength phonons in HH *** work provides a new strategy for further reducing the grain size andκ_(L)of medium-and high-entropy HH alloys.

关键词： Biphasic half-Heusler alloys Thermoelectric properties Entropy engineering Multiscale defects

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Isoindigo nanoparticles for photoacoustic imaging-guided tumor photothermal therapy

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Chinese Journal of Chemical Engineering 2024年第8期72卷 19-25页

作者： Yao Pei Ran Wang Xiang Rong Xiang Xia Hexiang Wang Zongwei Zhang Tian Qiu Saran Long Jianjun Du Jiangli Fan Wen Sun Xiaojun Peng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical EngineeringDalian University of TechnologyDalian 116024China ningbo institute of dalian university of technology Ningbo 315016China

The key factor in photothermal therapy lies in the selection of photothermal *** photothermal agents generally have problems such as poor photothermal stability and low photothermal conversion ***,we have designed and synthesized an isoindigo(IID)*** used isoindigo as the molecular center and introduced common triphenylamine and methoxy groups as *** order to improve the photothermal stability and tumor targeting ability,we encapsulated IID into *** a result,the nanoparticles exhibited high photothermal stability and photothermal conversion efficiency(67%)upon 635 nm laser ***,the nanoparticles demonstrated a significant inhibitory effect on live tumors in photothermal therapy guided by photoacoustic imaging and provided a viable strategy to overcome the treatment challenges.

关键词： Photothermal therapy Isoindigo Nanoparticles Photoacoustic imaging

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ZrNiSn-based compounds with high thermoelectric performance and ultralow lattice thermal conductivity via introduction of multiscale scattering centers

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Journal of Materiomics 2024年第1期10卷 200-209页

作者： Ruonan Min Yanxia Wang Xue Jiang Rongchun Chen Mingyang Li Huijun Kang Xiong Yang Zongning Chen Enyu Guo Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China ningbo institute of dalian university of technology Ningbo315000China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian116024China

The high lattice thermal conductivity of half-Heuslers(HHs)restricts the further enhancement of their thermoelectric figure-of-merit(ZT).In this study,multiscale scattering centers,such as point defects,dislocations,and nanoprecipitates,are synchronously introduced in a n-type ZrNiSn-based HH matrix through Nb doping and Hf *** lattice thermal conductivity is substantially decreased from 4.55(for the pristine ZrNiSn)to 1.8 W·m^(−1)·K^(−1) at 1123 K via phonon scattering over a broad wavelength range through the adjustment of multiscale *** value is close to the theoretically estimated lowest thermal *** power factor(PF)is enhanced from 3.25(for the pristine ZrNiSn)to 5.01 mW·m^(−1)·K^(−2) for Zr_(0.66)Hf_(0.30)Nb_(0.04)NiSn at 1123 K owing to the donor doping and band regulation via Nb doping and Hf *** can be ascribed to the synergistic interaction between the lowering of the lattice thermal conductivity and retention of the high ***,a ZT value of as high as 1.06 is achieved for Zr_(0.66)Hf_(0.30)Nb_(0.04)NiSn at 1123 *** work demonstrates that these actions are effective in jointly manipulating the transport of electrons and phonons,thereby improving the thermoelectric performance through defect engineering.

关键词： Half-Heusler compounds Dislocation Lattice thermal conductivity Nano precipitated phase Mechanical properties

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Ice-Induced Vibrational Response of Single-Pile Offshore Wind-Turbine Foundations

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Fluid Dynamics & Materials Processing 2024年第3期20卷 625-639页

作者： Zhoujie Zhu Gang Wang Qingquan Liu Guojun Wang Rui Dong Dayong Zhang Department of Renewable Energy Engineering PowerChina Huadong Engineering Corporation LimitedHangzhou311122China School of Ocean Science and technology Dalian University of TechnologyPanjin124221China ningbo institute of dalian university of technology Ningbo315000China

Important challenges must be addressed to make wind turbines sustainable renewable energy sources.A typical problem concerns the design of the *** the pile diameter is larger than that of the jacket platform,traditional mechanical models cannot be *** this study,relying on the seabed soil data of an offshore wind farm,the m-method and the equivalent embedded method are used to address the single-pile wind turbine foundation problem for different pile *** approach to determine the equivalent pile length is also proposed *** results provide evidence for the effectiveness and reliability of the model based on the equivalent embedded method.

关键词： Wind turbine ice-induced vibration dynamic response equivalent embedded method

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Effects of Reinforcement Content and Homogenization Treatment on the Microstructure and Mechanical Properties of in‑situ TiB_(2)/2219Al Composites

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1421-1437页

作者： Linwei Li Donghu Zhou Kai Zhao Lifeng Jiang Huijun Kang Enyu Guo Feng Mao Zongning Chen Tongmin Wang Key Laboratory of Solidification 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 National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003China Longmen Laboratory Luoyang 471000China

Obtaining an appropriate grain size is crucial for Al alloys or Al matrix composites prior to processing,as it significantly influences the mechanical properties of components and workability during the manufacturing ***_(2)particles are exceptional grain refiners in Al and serve as excellent reinforcement particles for particulate-reinforced aluminum matrix ***,the optimal particle content for achieving excellent refinement and strengthening effects depends on the matrix composition and requires further ***,homogenization is essential for mitigating the element segregation in the *** it is anticipated that adding suitable particles can effectively inhibit undesired grain growth during homogenization,comprehensive investigations on this aspect are currently ***,TiB_(2)/2219Al matrix composites with varying reinforcement contents(0,1,3,5 wt%)were fabricated through traditional casting followed by homogenization treatment to address these research *** effects of reinforcement content and homogenization treatment on the microstructure and mechanical properties of in-situ TiB_(2)/2219Al composites were *** results demonstrate a gradual strengthening of the refining effect with increasing particle ***,composites containing 3 wt%TiB_(2)particles exhibit superior comprehensive mechanical properties in both as-cast and homogenized ***,potential orientation relationships are observed and calculated between undissolved Al_(2)Cu eutectic phase and submicron or nanometer-sized TiB_(2)particles,resulting in a mixture structure with enhanced bonding *** mixture structure is continuously distributed along grain boundaries during solidification,forming a three-dimensional cellular network that acts as primary retarding forces for grain growth during ***,the established homogenization kinetic equations were further utilized to an

关键词： TiB_(2)/2219Al matrix composite Reinforcement content Homogenization treatment Homogenization kinetic Cellular structure Mechanical property

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Inverse design of mechanical metamaterial achieving a prescribedconstitutive curve

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Theoretical & Applied Mechanics Letters 2024年第1期14卷 16-22页

作者： Zongliang Du Tanghuai Bian Xiaoqiang Ren Yibo Jia Shan Tang Tianchen Cui Xu Guo State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDepartment of Engineering MechanicsDalian University of TechnologyDalian 116023China ningbo institute of dalian university of technology Ningbo 315016China

Besides exhibiting excellent capabilities such as energy absorption,phase-transforming metamaterials offer a vast design space for achieving nonlinear constitutive *** is facilitated by switching between different patterns under ***,the related inverse design problem is quite challenging,due to the lack of appropriate mathematical formulation and the convergence issue in the post-buckling analysis of intermediate *** this work,periodic unit cells are explicitly described by the moving morphable voids method and effectively analyzed by eliminating the degrees of freedom in void ***,by exploring the Pareto frontiers between error and cost,an inverse design formulation is proposed for unit *** formulation aims to achieve a prescribed constitutive curve and is validated through numerical examples and experimental *** design approach presented here can be extended to the inverse design of other types of mechanical metamaterials with prescribed nonlinear effective properties.

关键词： Metamaterial Pattern-transformation Constitutive curve Inverse design

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Microstructure and texture evolution of Cu-Cr-Co-Ti alloys during the two-stage cryorolling

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Rare Metals 2024年第9期43卷 4535-4547页

作者： Jia-Jun Zhang Long-Jian Li Zhi-Feng Liu Zong-Ning Chen En-Yu Guo Hui-Jun Kang Ren-Geng 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 Center of Hyper-Gravity Experimental and Interdisciplinary Research Zhejiang UniversityHangzhou 310058China ningbo institute of dalian university of technology Ningbo 315000China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China

This study entailed an investigation of the mechanical properties,microstructural and texture orientation evolutions of Cu-Cr-Co-Ti alloys prepared via twostage cryorolling and intermediate aging *** this end,X-ray diffraction and electron backscatter diffraction were *** results indicate that the two-stage cryorolling and intermediate aging treatments led to the development of profuse twin bundles and significantly enhanced the mechanical *** initial cryorolling led to coplanar slip and developed a strong Y({111})orientation,accelerating the formation of Goss({011})orientation and a Brass-type *** intermediate aging treatment relieved the restriction on dislocation slip and reoriented the grains toward the Copper({112})and Z({111})*** Z orientation,with a relatively high volume fraction,dominated the *** cryorolling intensified twinning and shear banding,transforming the Copper-type shear bands into Brass-type shear bands with rhomboidal prism *** areas inside the Brasstype shear bands exhibited a Y orientation,and the areas outside the shear bands exhibited a stable Brass-type *** evident decrease in the weighted Schmid factors demonstrated that the two-stage cryorolling and intermediate aging treatment can modify the texture evolution and aid the design of high-performance Cu alloys.

关键词： Copper alloys Two-stage cryorolling Macrotexture evolution Electron backscatter diffraction Schmid factor

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First-principles study of electronic and magnetic properties of Fe atoms on Cu_(2)N/Cu(100)

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Chinese Physics B 2024年第8期33卷 498-503页

作者：陈佳乐胡军 institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

First-principles calculations were conducted to investigate the structural,electronic,and magnetic properties of single Fe atoms and Fe dimers on Cu_(2)N/Cu(100).Upon adsorption of an Fe atom onto Cu_(2)N/Cu(100),robust Fe-N bonds form,resulting in the incorporation of both single Fe atoms and Fe dimers within the surface Cu_(2)N *** partial occupancy of Fe-3d orbitals lead to large spin moments on the Fe ***,both single Fe atoms and Fe dimers exhibit in-plane magnetic anisotropy,with the magnetic anisotropy energy(MAE)of an Fe dimer exceeding twice that of a single Fe *** magnetic anisotropy can be attributed to the predominant contribution of the component along the x direction of the spin-orbital coupling ***,the formation of Fe-Cu dimers may further boost the magnetic anisotropy,as the energy levels of the Fe-3d orbitals are remarkably influenced by the presence of Cu *** study manifests the significance of uncovering the origin of magnetic anisotropy in engineering the magnetic properties of magnetic nanostructures.

关键词： magnetic nanostructures magnetic anisotropy spin–orbital coupling ultrathin substrate

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Dynamic Analysis of a 10 MW Floating Offshore Wind Turbine Considering the Tower and Platform Flexibility

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Journal of Ocean university of China 2024年第2期23卷 358-370页

作者： GAO Shan ZHANG Lixian SHI Wei WANG Wenhua WANG Bin LI Xin Key Laboratory of Far-Shore Wind Power technology of Zhejiang Province Hangzhou 311122China State Key Laboratory of Coastal and Offshore Engineering Deepwater Engineering Research CenterDalian University of TechnologyDalian 116024China Powerchina Huadong Engineering Corporation Limited Hangzhou 311122China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China ningbo institute of dalian university of technology Ningbo 315000China

Recently,semisubmersible floating offshore wind turbine technologies have received considerable *** the coupled simulation of semisubmersible floating offshore wind energy,the platform is usually considered a rigid model,which could affect the calculation accuracy of the dynamic *** dynamic responses of a TripleSpar floating offshore wind turbine equipped with a 10 MW offshore wind turbine are discussed *** simulation of a floating offshore wind turbine under regular waves,white noise waves,and combined wind-wave conditions is *** effects of the tower and platform flexibility on the motion and force responses of the TripleSpar semisubmersible floating offshore wind turbine are *** results show that the flexibility of the tower and platform can influence the dynamic responses of a TripleSpar semisubmersible floating offshore wind *** the flexibility of the tower and platform,the tower and platform pitch motions markedly increased compared with the fully rigid ***,the force responses,particularly for tower base loads,are considerably influenced by the flexibility of the tower and ***,the flexibility of the tower and platform for the coupled simulation of floating offshore wind turbines must be appropriately examined.

关键词： floating offshore wind turbine TripleSpar semisubmersible platform rigidity and flexibility platform coupled simulation

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Carrier transport barrier in AlGaN-based deep ultraviolet LEDs on offcut sapphire substrates

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Chinese Optics Letters 2024年第2期22卷 148-158页

作者：陈秋爽陈荔陈聪高歌郭炜叶继春 ningbo institute of Materials technology and Engineering Ningbo 315201China university of Chinese Academy of Sciences Beijing 100049China

AlGaN-based light-emitting diodes(LEDs)on offcut substrates enhance radiative emission via forming carrier localization centers in multiple quantum wells(MQWs).This study introduces the carrier transport barrier concept,accessing its impact on the quantum efficiency of LEDs grown on different offcut sapphire substrates.A significantly enhanced internal quantum efficiency(IQE)of 83.1%is obtained from MQWs on the 1°offcut sapphire,almost twice that of the controlled 0.2°offcut ***,1°offcut LEDs have higher turn-on voltage and weaker electroluminescence than 0.2°*** calculations demonstrate the existence of a potential barrier on the current path around the step-induced Ga-rich ***-rich stripes reduce the turn-on voltage but restrict sufficient driving current,impacting LED performance.

关键词： carrier localization step-bunching potential barrier offcut substrate DUV LEDs

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