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Micromechanics in Mg alloys:Role of hard Al2RE precipitates

Journal of Materials science & technology 2024年第33期200卷 112-128页

作者： Hui Su Junsheng Wang Chengpeng Xue Guangyuan Tian Shuo Wang Xinghai Yang Quan Li Yisheng Miao Zhihao Yang Yanan Meng School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

The influence of hard Al_(2)RE phases(Sc,Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,and Lu)on the overall and local deformation as well as damage mechanism of Mg alloys has been studied by using a crystal plasticity model based on dislocation density with a brittle damage *** that lead to swift damage initiation and propagation throughout the matrix have been *** has been found that the hard Al_(2)RE with higher elastic modulus enhances the damage resistance of the Mg matrix,which was confirmed by fracture SEM/EDS characterizations and phase-field damage *** discovery provides valuable insights for designing Mg alloys with both high stiffness and enhanced damage resistance.

关键词： Al_(2)RE phase Dislocation density Damage and fracture CPFEM Deformation behavior

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RESEARCH ON THE FOCUS OF SIGHTSEEING EXPERIENCE AND EVALUATION IN VR SPACE COMPARED TO REAL-WORLD SPACE

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Journal of Environmental engineering (Japan) 2024年第823期89卷 502-513页

作者： Matsuura, Yasuaki Nishina, Daisaku Sugita, So Jiang, Rui Kindaichi, Sayaka Hou, Ning Gao, Weixuan Graduate School of Advanced Science and Eng. Hiroshima University Japan Graduate School of Advanced Science and Eng. Hiroshima University Japan Hiroshima Institute of Technology Japan Graduate School of Advanced Science and Engineering Hiroshima University Japan Graduate School of Advanced Science and Eng. Hiroshima University Japan Graduate School of Advanced Science and Eng. Hiroshima University Japan

In order to examine the effective use of "tourism experience in VR space," we clarify to: What extent VR can substitute for on-site tourism? Whether VR experience stimulates the desire to visit? We created a VR space in which subjects could experience sightseeing as much as possible in the same way as in the on-site. After allowing them to freely tour the area, we asked them to evaluate the content of the experience and the sightseeing spot. Also, we conducted a similar experiment in the actual site to compare the both results. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Tourism

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Perspective on powder technology for all-solid-state batteries:How to pair sulfide electrolyte with high-voltage cathode

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Particuology 2024年第3期86卷 55-66页

作者： Jiangkui Hu Shijie Yang Yingying Pei Xilong Wang Yulong Liao Shuai Li Aolong Yue Jia-Qi Huang Hong Yuan School of Materials Science&Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China

Sulfide solid electrolytes(SEs)have attracted ever-increasing attention due to their superior roomtemperature ionic conductivity(~10^(-2) S cm^(-1)).Additionally,the integration of sulfide SEs and highvoltage cathodes is promising to achieve higher energy ***,the incompatible interfaces between sulfide SEs and high-voltage cathodes have been one of the key factors limiting their ***,this review presents a critical summarization of the interfacial issues in all-solid-state lithium batteries based on sulfide SEs and high-voltage cathodes and proposes strategies to stabilize the electrolyte/cathode ***,the future research direction of electrolyte/cathode interfaces and application prospects of powder technology in sulfide-based ASSLBs were also discussed.

关键词： Sulfide solid electrolytes High-voltage cathodes Electrode/electrolyte interfaces All-solid-state lithium batteries

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In-situ Observation of Inclusion Formation Behaviors during Solidification Process Using Model Alloy

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第3期111卷 85-94页

作者： Kawanishi, Sakiko Tsukahara, Yuki Terashima, Shingo Nakao, Haruto Sukenaga, Sohei Shibata, Hiroyuki Department of Energy Science and Technology Graduate School of Energy Science Kyoto University Japan Department of Metallurgy Graduate School of Engineering Tohoku University Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Japan

The formation of secondary inclusions during the solidification process of molten steel is a complex phenomenon triggered by microsegregation. Controlling the dispersion of secondary inclusions in the solidified steel is an important issue that greatly affects the properties of the steel;however, the distribution of inclusions after solidification does not always coincide with the locations of inclusion formation. Therefore, it is still difficult to estimate when, where, and at what supersaturation level inclusions crystallize in the liquid phase, and it is desirable to clarify their formation behavior to control the dispersion of inclusions. In this study, we investigated the formation process of inclusion using a ternary model material of succinonitrile-water-lumogen yellow by in-situ observation, where the formation of oversaturated lumogen yellow can be regarded as the inclusion formation. It was confirmed that the frequency of inclusion formation increased significantly when the solution was held at lower temperatures, i.e., when a large supersaturation ratio was given. The results of the formation frequency indicated that the formation of inclusions occurred in the liquid phase according to the classical nucleation theory. © 2025 The Iron and Steel Institute of Japan.

关键词： Dispersions

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One-pot synthesis of Cu:InP multishell quantum dots for nearinfrared light-emitting devices

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Nano Research 2024年第12期17卷 10655-10660页

作者： Pan Huang Xiaonan Liu Xiao Liu Jing Wei Fangze Liu Hongbo Li Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyZhuhai 519088China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

InP quantum dots(QDs)are promising heavy-metal-free materials for next-generation solid-state lighting,covering from visible to near-infrared(NIR)*** with the rapid development of visible InP QDs,the synthesis of high-performance NIR InP QDs remains to be *** this work,we report a simple one-pot synthesis of NIR InP QDs by controlling the Cu doping and designing a multishell *** replacing the conventional highly reactive phosphorus precursor with a slightly less reactive and low-cost ammonia phosphorus precursor,the nucleation process is effectively regulated for efficient Cu *** addition,the epitaxial growth of the ZnSe/ZnS shell further improves the stability and optical properties of InP ***,the synthesized Cu:InP/ZnSe/ZnS QDs have a photoluminescence quantum yield of 70%centered at 833 *** NIR InP lightemitting diodes exhibit a maximum radiance of 3.1 W·sr^(-1)·m^(-2)and a peak external quantum efficiency of 2.71%centered at 864 nm.

关键词： near-Infrared InP quantum dots core-shell light-emitting diodes

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Quantitative Understanding of Solute Concentration Distribution by Microsegregation during Solidification

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第3期111卷 75-84页

作者： Kawanishi, Sakiko Terashima, Shingo Tsukahara, Yuki Sukenaga, Sohei Esaka, Hisao Shibata, Hiroyuki Department of Energy Science and Technology Graduate School of Energy Science Kyoto University Japan Department of Metallurgy Graduate School of Engineering Tohoku University Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Japan Graduate School of Engineering Osaka University Japan

Microsegregation of solute components during the solidification process causes solute pile-up in the liquid phase, which strongly affects the formation behavior of inclusions. However, there is no quantitative evaluation of solute concentration distribution during dendritic growth. In this study, we established an in-situ observation method for quantitative evaluation of solute concentration distribution using model materials with fluorescent reagents to clarify how the solute pile-up progresses due to microsegregation. In addition to evaluating the physical properties of the model materials necessary for this study, a quantitative evaluation of solute concentration distribution during dendritic growth was successfully achieved. Numerical analysis, taking into account the equilibrium partition of solute components and solute diffusion in each phase, reproduced the measured solute concentration distribution in the liquid phase. Thus, the solute concentration distribution was evaluated by the actual measurement and numerical analysis, and it was clarified that a relatively simple model can represent the progress of microsegregation. © 2025 Iron and Steel Institute of Japan. All rights reserved.

关键词： Materials properties

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Design of polar boundaries enhancing negative electrocaloric performance by antiferroelectric phase-field simulations

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npj Computational Materials 2024年第1期10卷 1697-1704页

作者： Ke Xu Xiaoming Shi Cancan Shao Shouzhe Dong Houbing Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China School of Mathematics and Physics University of Science and Technology BeijingBeijing100083China

Electrocaloric refrigeration which is environmentally benign has attracted considerable *** distinction to ferroelectric materials,which exhibit an extremely high positive electrocaloric effect near the Curie temperature,antiferroelectric materials represented by PbZrO_(3) have a specific negative electrocaloric effect,i.e.,electric field decreases the temperature of the ***,the explanation of the microscopic mechanism of the negative electrocaloric effect is still unclear,and further research is still needed to provide a theoretical basis for the negative electrocaloric effect enhancement.

关键词： materials ferroelectric effect

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Competitive coordination enhancing the thermal stability of PDOL electrolytes for safe solid-state lithium metal batteries

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Nano Research 2025年第3期18卷 243-251页

作者： Ying-Ying Pei Jiang-Kui Hu Hong Yuan Shi-Jie Yang Xi-Long Wang Zheng Liao Jia Liu Bo-Quan Li Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China College of Materials Science and Technology Beijing Forestry UniversityBeijing 100083China

Poly(1,3-dioxolane)(PDOL)-based solid electrolytes hold great potential for solid-state lithium(Li)metal batteries due to their superior ionic conductivity at room ***,traditional PDOL electrolytes suffer from inferior thermal stability,which has hampered their practical *** this work,a competitive coordination mechanism is proposed to strengthen vulnerable ether oxygen bonds in PDOL chains,thereby improving the thermal stability of PDOL *** strong coordination of Lewis base ligands on Li_(6.75)La_(3)Zr_(1.75)Ta_(0.25)O_(12)(LLZTO)surface with Li ions weakens the ionic-dipolar interactions between PDOL chains and Li ions,conversely reinforcing the bond energy of ether oxygen *** LLZTO into PDOL electrolytes effectively enhances the thermal decomposition temperature from 110 to 302℃.Li||LiFePO_(4)full cell with a 12μm ultrathin PDOL hybrid electrolyte delivers enhanced discharge capacity and extended cycling life for 100 cycles at an elevated temperature of 60℃.This work provides critical insights into the development of thermally stable PDOL electrolytes for safe solid-state Li metal batteries.

关键词： competitive coordination solid-state battery lithium metal safety electrolyte design

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Premature deposition of lithium polysulfide in lithium-sulfur batteries

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Journal of Energy Chemistry 2023年第7期82卷 507-512,I0011页

作者： Zi-Xian Chen Yu-Tong Zhang Chen-Xi Bi Meng Zhao Rui Zhang Bo-Quan Li Jia-Qi Huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Lithium-sulfur(Li-S)batteries have attracted extensive attention due to ultrahigh theoretical energy density of 2600 Wh kg^(-1).Liquid-solid deposition from dissolved lithium polysulfides(LiPSs)to solid lithium sulfide(Li_(2)S)largely determines the actual battery ***,a premature liquidsolid deposition process of LiPSs is revealed at higher thermodynamic potential than Li_(2)S deposition in Li-S *** premature solid deposit exhibits higher chemical state and hemispherical morphology in comparison with Li_(2)S,and the premature deposition process is slower in kinetics and higher in deposition ***,a supersaturation deposition mechanism is proposed to rationalize the above findings based on thermodynamic *** work demonstrates a unique premature liquid-solid deposition process of Li-S batteries.

关键词： Lithium-sulfur batteries Lithium polysulfides Liquid-solid deposition Supersaturation

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Identifying the crystal structure of T 1 precipitates in Al-Li-Cu alloys by ab initio calculations and HAADF-STEM imaging

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Journal of Materials science & technology 2023年第2期133卷 41-57页

作者： Shuo Wang Xianghai Yang Junsheng Wang Chi Zhang Chengpeng Xue School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Controversial experimental reports on the crystal structure of T 1 precipitates in Al-Li-Cu alloys have ex-isted for a long time,and all of them can be classified into five *** clarify its ground-state atomic structure,herein,we have combined high-throughput first-principles calculations and CALPHAD,as well as aberration-corrected HAADF-STEM *** the special quasi-random structure(SQS)and supercell approximation(SPA)methods to simulate the local disorder on Al-Cu sub-lattices,we find that none of the present models can satisfy the phase stability in Al-Li-Cu ternary system based on temperature-dependent convex hull *** the cluster expansion(CE)formulas,structural predic-tions derived from the five-frame models were ***,by introducing the vibrational contribution to the free energy at aging temperatures,we proposed a novel ground-state T 1 structure that maintains a coherent relationship with Al-matrix at the<112>Al *** underlying phase transition between the variants of T 1 precipitates was further *** means of ab initio molecular dynamics(AIMD)simulations,we resolved the controversy regarding the number of atomic layers con-stituting the T 1 phase and acknowledged the existence of Al-Li corrugated *** root cause of this structural distortion is triggered by atomic forces and *** work can have an positive impact on the novel fourth generation of Al-Cu-Li alloy designs by engineering the T 1 strengthening phase.

关键词： Al-Cu-Li alloys T 1 precipitates Cluster expansion First-principle calculations ab initio molecular dynamics HAADF-STEM

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