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8th Annual International Conference on Material science and Engineering, ICMSE 2020

作者： Zhou, Lijiang Xu, Songlin Peng, Weicai National Key Laboratory on Ship Vibration and Noise China Ship Development and Design Center No. 268 Zhangzhidong Road Wuhan Hubei430064 China Cas Key Laboratory for Mechanical Behavior and Design of Materials University of Science and Technology of China No. 443 Huangshan Road Hefei Anhui230027 China

The macro-scale mechanical behaviors of materials under impact can be dominated by the meso and micro-scale deformation mechanisms and cracking patterns. In combination with the X-ray imaging and diffraction techniques, impact tests are performed on boron carbide (B4C) ceramic bulks with two different porosities by a miniature split Hopkinson pressure bar (SHPB). After a transient quasi-elastic deformation process, catastrophic failure occurs in the high-porosity bulk, with a weak failure strength. Abundant tensile and shear cracks nucleate in the low porosity bulk, but cannot connect into a cracks network due to the high adhesive force, and finally the dissociative failure occurs with several main cracks penetrating. By analyzing the diffraction peak splitting phenomenon, the extent of shear deformation is quantitatively characterized to be 60-70% of the compression deformation. The damage extent is expressed by the voids volume induced by cracks. The macroscopic stress increment of B4C bulk under impact can be expressed by a function of the damage extent evolution. © Published under licence by IOP Publishing Ltd.

关键词： Boron carbide

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In-situ diagnosis of heat loads on divertor tungsten targets using laser speckle digital image correlation

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Nuclear Engineering and technology 2025年第11期57卷

作者： Zhang Dale Jiang Menglai Li Ledi He Shengnan Li Hang Pan Zhiwei Huang Shenghong Wang Weihua Su Yong Institute of Physical Science and Information Technology Anhui University Hefei 230601 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China School of Biomedical Engineering Anhui Medical University Hefei 230032 China

Based on a high heat flux (∼300 MW) comprehensive experimental platform, this study used the laser speckle digital image correlation (LS-DIC) method to measure the thermal strain of the tungsten target plates from 190°C–2952 °C, that was used to invert the temperature field distribution and heat loads of the target plates, realizing the synchronous in-situ measurement of the strains, temperatures and heat loads of the tungsten target plates under extreme high temperature. By comparing with the tungsten thermal strains in literature, the average relative errors of LS-DIC measurement results in different temperature ranges are 2 % within 190–1100 °C and 6 % within 1040–2952 °C. The feasibility and accuracy of using LS-DIC to diagnose temperature field and heat loads were verified, the inversion results were compared with Ansys simulation results and actual loading data of heat loads, and the error rates of temperature and heat loads inversion were less than 6 % and 7 %, respectively. The LS-DIC method proposed in this study is expected to be applied to the non-contact, in-situ measurement of material strain and temperature under extreme environments as well as the inversion of heat loads.

关键词： Digital image correlation (DIC) Laser speckles Thermal strain Heat loads inversion Temperature inversion

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Introducing a Single Crystal Structure in Polycrystalline Inconel 718 Superalloy Via Laser Directed Energy Deposition

SSRN

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SSRN 2022年

作者： Li, Zuo Lin, Xin Zhao, Xuan Ma, Xu Hao, Zhiwei Yao, Bo Zhong, Chongliang Gasser, Andres Tan, Hua Sui, Shang Chen, Jing State Key Laboratory of Solidification Processing Northwestern Polytechnical University 127 Youyixilu Shaanxi Xi’an710072 China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT China Northwestern Polytechnical University 127 Youyixilu Shaanxi Xi’an710072 China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical University Shaanxi Xi’an710072 China Fraunhofer Institute for Laser Technology ILT Steinbachstr. 15 Aachen52074 Germany Northwestern Polytechnical University China

The grain boundaries have always been the accomplice in deteriorating high-temperature mechanical properties of alloys because the bonding strength of grain boundaries is lower than that of internal grains at high temperature. Reducing or even eliminating the transverse grain boundary perpendicular to the stress axis is the best choice to boost the high-temperature mechanical properties of Inconel 718 alloy without changing the alloy composition. Herein, Inconel 718 single-wall specimen (height: 20 mm) with a single crystal (SX) structure was successfully prepared by laser directed energy deposition (LDED) for the first time. Except for few stray grains (SGs) on the top region, the rest are all SX structure. Subsequently, the stress rupture life at 650 °C of sample subjected to direct aging treatment was tested and up to 180 h, far exceeding the measured value of the forging (110 h). This indicates that imparting SX structure to Inconel 718 polycrystalline alloy is beneficial to improve high-temperature mechanical properties. At last, the formation of SG during LDED process were elucidated combined numerical simulation and solidification theory, revealing that it is primarily affected by the angle ψmax between normal direction to the side edge of melt pool and [001] direction. The melt pool with shallower and flatter shape could facilitate the formation of SX. Moreover, the effect of liquid flow on the dendrite deflection was also investigated and found that employing reciprocating scanning strategy between layers could inhibit this affection. © 2022, The Authors. All rights reserved.

关键词： Grain boundaries

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Advantage of selective production of green rusts for Sb(Ⅴ) removal in Fe(0) electrocoagulation

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Chinese Chemical Letters 2020年第10期31卷 2779-2783页

作者： Di Cao Meng Qiao Angzhen Li Jingwei Hao Xu Zhao Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China China ENFI Engineering Corporation Beijing 100038China China Academy of Urban Planning and Design Beijing 100037China

The re moval efficiency of pollutants in Fe(O) electrocoagulation(EC) has been associated closely with the speciation of generated Fe(Ⅱ)/Fe(Ⅲ) oxides during this process,which is very complicated and can be affected by various *** this work,in-situ Raman,X-ray diffraction and some other techniques have been used to study the speciation of Fe under different conditions and to establish a relationship between Fe speciation and Sb(V) removal *** indicated that concentration of dissolved oxygen(DO)is a key factor influencing Fe(O) *** was found that green rusts(GRs) were formed and were then transformed into magnetite at lower DO concentration,and Sb(V) removal efficiency reached 99.9% after30 min of *** contrast,γ-FeOOH was formed at high DO concentration,and the removal efficiency of Sb(V) after 30 min of EC was only 72.8%.In the presence of sulfite and phosphate with low concentrations,GRs can be stabilized and benefit the removal of Sb(V).We believe this work will provide some new insights on the mechanism of Fe(O) EC and the effective removal of other pollutants during Fe(O)EC process.

关键词： Iron electrocoagulation Antimony Green rusts Sodium sulfite Phosphate

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Application of feedforward predictive control in DC furnace coordination system

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Journal of Physics: Conference Series 2021年第1期1780卷

作者： Zhiguang DENG HE Zhengxi ZHU Biwei ZHU Jialiang LV Xin WU Qian National Key Labortory of Science and Technology on Reactor System Design Technology Chengdu610213China

In order to solve the control difficulties such as large dynamic delay, serious coupling between machine and furnace and strong nonlinear, the feedforward and feedback predictive control is proposed to control the coordinated system on the basis of multi-model predictive control, and the static feedforward part designs the feed line feedforward of coal quantity against coal quality disturbance on the basis of the accurate balance of energy. Thus, the reference total fuel quantity under the target load instruction is determined, and the dynamic part fully considers the dynamic compensation of the unit energy storage, gives a certain overshoot fuel quantity to the boiler regulation, speeds up its response, and ensures the rapidity of the unit. The real-time simulation results of virtual DPU (Distributed Processing Unit) show that the designed feedforward-feedback predictive control can quickly respond to load change, improve the resistance to fuel disturbance, reduce the fluctuation of main steam pressure, and better ensure the safe, economic and stable operation of the coordination system.

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Surrogate representation of sink strengths and the long-term role of crystalline interfaces in the development of irradiation-induced bubbles

arXiv

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arXiv 2020年

作者： Luo, Jing Xin, Yong Zhou, Zhengcheng Zhu, Yichao Guo, Xu Department of Engineering Mechanics Dalian University of Technology Dalian116023 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology China International Research Center for Computational Mechanics Dalian University of Technology China

The present article addresses an early-stage attempt on replacing the analyticity-based sink strength terms in rate equations by surrogate models of machine learning representation. Here we emphasise, in the context of multiscale modelling, a combinative use of machine learning with scale analysis, through which a set of fine-resolution problems of partial differential equations describing the (quasi-steady) short-range individual sink behaviour can be asymptotically sorted out from the mean-field kinetics. Hence the training of machine learning is restrictively oriented, that is, to express the local and already identified, but analytically unavailable nonlinear functional relationships between the sink strengths and other local continuum field quantities. With the trained models, one is enabled to quantitatively investigate the biased effect shown by a void/bubble being a point defect sink, and the results are compared with existing ones over well-studied scenarios. Moreover, the faster diffusive mechanisms on crystalline interfaces are distinguishingly modelled by locally planar rate equations, and their linkages with rate equations for bulk diffusion are formulated through derivative jumps of point defect concentrations across the interfaces. Thus the distinctive role of crystalline interfaces as partial sinks and quick diffusive channels can be investigated. Methodologicalwise, the present treatment is also applicable for studying more complicated situation of long-term sink behaviour observed in irradiated materials. Copyright © 2020, The Authors. All rights reserved.

关键词： Machine learning

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简单的蛋白质组装激活三光子活性:由烷基链"奇-偶"效应调控其"之"字形提升

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中国科学：材料科学（英文版） 2023年第6期66卷 2483-2491页

作者：王君君朱亿彩李劲松王爱东余志鹏汪森周虹屏 Anhui University School of Chemistry and Chemical Engineering Institute of Physical Science and Information Technology Center of Free Electron Laser & High Magnetic Field Hefei China (GRID:grid.252245.6) (ISNI:0000 0001 0085 4987) Key Laboratory of Structure and Functional Regulation of Hybrid Materials (Anhui University) Ministry of Education Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials of Anhui Province Hefei China (GRID:grid.252245.6) (ISNI:0000 0001 0085 4987) Huangshan University Key Laboratory of Drug Design Huangshan China (GRID:grid.440766.7) (ISNI:0000 0004 1756 0119)

设计具有高阶多光子活性、无重原子的纳米光敏剂,用于近红外(NIR-Ⅱ,1000-1700 nm)二区光诱导的深层肿瘤的光动力学治疗是一个棘手的挑战.本文利用牛血清白蛋白(BSA)与一系列无重原子光敏剂TPA-nCs(n=2-7)进行超分子组装.通过一种简单... 详细信息

设计具有高阶多光子活性、无重原子的纳米光敏剂,用于近红外(NIR-Ⅱ,1000-1700 nm)二区光诱导的深层肿瘤的光动力学治疗是一个棘手的挑战.本文利用牛血清白蛋白(BSA)与一系列无重原子光敏剂TPA-nCs(n=2-7)进行超分子组装.通过一种简单的方式,成功激活了TPA-nCs多光子荧光,并展现了"奇-偶"效应的趋势,揭示了一个有趣的构效关系.具体来说,奇、偶数烷基取代TPA-nCs偶极矩的差异,导致制备的蛋白质纳米组装体TPA-nCs@BSA呈现了"之"字型增强的三光子荧光性能.其中,TPA-7C@BSA具有最大的三光子吸收截面(可达到4.81 × 10-81 cm6 s2 photon-2),其在1250 nm近红外光照射下产生的活性氧物种可实现H22肿瘤高效光动力学治疗.本文报道的烷基链"奇-偶"调控为开发和改进多光子无重原子光敏材料在生物医学中的应用提供了新的思路.

关键词： nano-photosensitizer NIR-II window protein assembly three-photon activity “odd-even” effect

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Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy

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Journal of Materials science & technology 2019年第11期35卷 2652-2657页

作者： H.Xu X.B.Li W.W.Xing L.Shu Y.C.Ma K.Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

The phase transformation behavior of an as-cast Ti-42Al-5 Mn(at.%)alloy after subsequent quenching from 1380℃to 1000℃was investigated based on the differential thermal analysis(DTA),electron probe micro analyzer-backscattered electrons(EPMA-BSE),transmission electron microscope(TEM)and X-ray diffraction(XRD).The results show that,the solidification path can be summarized as follows:Liquid→Liquid+β→β→β→α→β+α+γ→βo+α2+γ→βo+γ+α2/γ→βo+γ+α2/γ+βo,sec,with the phase transformationα→βtemperature(Tβ)=1311℃,phase transformationγ→βtemperature of(Tγsolv)=1231℃,phase transformationα2→αorβo→βtemperature(Tα2→α/Tβo→β)=1168 C,eutectoid temperature(Teut)=1132℃and T(α2/γ→βo,sec)≈1120℃.In comparison with Ti-42 Al alloy,the Teut and Tγsolv are slightly increased while both the Tp is decreased obviously by 5%Mn *** quenched from the temperature of 1380-1260℃,the martensitic transformationβ→α'could occur to form the needlelike martensite structure inβ*** kind of martensitic structure is much obvious with the increase of temperature from 1260℃to 1380℃.When the temperature is below Tγsolv(1231℃),theγgrains would nucleate directly from theβ*** the temperature slightly lower than T(eut)(1132℃),the dottedβ(o,sec)phases could nucleate in the lamellar colonies besides theγlamellae precipitated withinα2 ***,at room-temperature(RT),the alloy exhibits(po+α2+γ)triple phase with microstructure ofβo+lamellae+γ,of which the lamellar structure consists ofα2,γandβo,sec *** phase transformation mechanisms in this alloy,involvingβ→α',β→γ,α2→α2/γandα2→βo,sec were discussed.

关键词： Titanium aluminides Quenching Phase transformation Microstructure βphase

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Layer Hall Effect without External Electric Field

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Physical Review Letters 2025年第23期134卷 236206-236206页

作者： Yulei Han Yunpeng Guo Zeyu Li Zhenhua Qiao Department of Physics Fuzhou University Fuzhou Fujian 350108 China International Center for Quantum Design of Functional Materials CAS Key Laboratory of Strongly Coupled Quantum Matter Physics and Department of Physics University of Science and Technology of China Hefei Anhui 230026 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

The layer Hall effect is an intriguing phenomenon observed in magnetic topological layered materials, where the Hall response arises from the opposite deflection of electrons on top and bottom layers. To realize the layer Hall effect, space-time PT symmetry is typically broken by applying an external electric field. In this Letter, we propose a new mechanism to realize the layer Hall effect by introducing inequivalent exchange fields on both surfaces of a topological insulator thin film in the absence of an electric field. This approach yields a distinct Hall response compared to the conventional electric-field-induced layer Hall effect, particularly with respect to the Fermi level. Taking the topological insulator Sb2Te3 as a concrete example, we demonstrate the feasibility of inducing the layer Hall effect only by coupling the top and bottom surfaces of Sb2Te3 with different magnetic insulators. Notably, we show that both built-in electric-field-induced and inequivalent exchange-field-induced layer Hall effects can be achieved by tuning the stacking order between Sb2Te3 and the magnetic layers. Given the well-established experimental techniques for fabricating topological insulator thin films, our work offers a viable pathway for realizing layer Hall effect without external electric field.

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Numerical Simulation of Self-balanced Warm-Air Heating in Boiler-Room of Thermal Power Plant in Winter 11th

Numerical Simulation of Self-balanced Warm-Air Heating in Bo...

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11th International Symposium on Heating, Ventilation and Air Conditioning, ISHVAC 2019

作者： Cao, Huizhe Wang, Yuhang Zhao, Tianli Qu, Jiagang Zhai, Jinfang Cai, Weihua School of Architecture Harbin Institute of Technology Harbin China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology Harbin China School of Energy Science and Engineering Harbin Institute of Technology Harbin China Northeast Electric Power Design Institute China Power Engineering Consulting Group Changchun China School of Energy and Power Engineering Northeast Electric Power University Jilin China

ISBN: (纸本)9789811395192

The boiler-room of a large-scale thermal power plant belongs to super-high industrial building. The heat is concentrated in the upper part of the workshop. In the northern cold region, the wasted heat at the top of the boiler-room can be sent to the main plant-floor by the reversal of the roof-fans. The heat which dissipates from internal equipment is used to provide heating in winter, then the self-balanced heating can be achieved in the plant. In this paper, CFD simulation is used to analyze the high-pressure roof-fan reversing condition in the boiler-room. Combined with the airflow organization simulation results, different multiple airflow relay schemes are constructed through simulating the temperature field and velocity field to optimize the layout scheme of the relays of each equipment layer. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Roofs

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