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Effect of stress loading direction on microstructure evolution and age-hardening behavior of a stress-aged Mg-7Sn alloy

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Journal of Alloys and Compounds 2025年 1032卷

作者： Jiang, Jing Ran, Jishang Tong, Lin Bi, Guangli Li, Yuandong Chen, Tijun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Material Science and Engineering Lanzhou University of Technology Lanzhou730050 China AVIC Shaanxi Hongyuan Aviation Forging Company Ltd. Xianyang713801 China

The effect of stress loading direction on microstructure evolution and age-hardening behavior of a stress-aged Mg-7Sn alloy with a compressed stress of 40 MPa at 160 °C was investigated in this paper. The compressive stress perpendicular to the c-axis effectively facilitated the formation of a high volume fraction of twins and Mg2Sn phases, thereby promoting a c-axis//ED texture. In contrast, the stress parallel to the c-axis resulted in the formation of small amounts of twins and Mg2Sn phases, which further reinforced the basal plane texture. The stress aging with compressive stress applied perpendicular to the c-axis significantly increased the peak hardness of the alloy and reduced the time reached the peak hardness, compared to compressive stress applied parallel to the c-axis. The compressive testing results indicated that the stress peak-aged alloy perpendicular to the c-axis exhibited excellent mechanical properties, whose compressive yield strength, ultimate compressive strength and compressive elongation were 191.3 MPa, 449.9 MPa and 12.6 %, respectively. The high compressive strengths of the peak-aged alloy at a compressive stress perpendicular to the c-axis was mainly attributed to the grain refinement and precipitation strengthening of Mg2Sn phase. © 2025 Elsevier B.V.

关键词： Microhardness

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Numerical simulation of materials-oriented ultra-precision diamond cutting:review and outlook

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International Journal of Extreme Manufacturing 2023年第2期5卷 1-21页

作者： Liang Zhao Junjie Zhang Jianguo Zhang Houfu Dai Alexander Hartmaier Tao Sun Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Mechanical and Engineering Guizhou UniversityGuizhou 550025People’s Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University BochumBochum 44801Germany

Ultra-precision diamond cutting is a promising machining technique for realizing ultra-smooth surface of different kinds of *** fundamental understanding of the impact of workpiece material properties on cutting mechanisms is crucial for promoting the capability of the machining technique,numerical simulation methods at different length and time scales act as important supplements to experimental *** this work,we present a compact review on recent advancements in the numerical simulations of material-oriented diamond cutting,in which representative machining phenomena are systematically summarized and discussed by multiscale simulations such as molecular dynamics simulation and finite element simulation:the anisotropy cutting behavior of polycrystalline material,the thermo-mechanical coupling tool-chip friction states,the synergetic cutting responses of individual phase in composite materials,and the impact of various external energetic fields on cutting *** particular,the novel physics-based numerical models,which involve the high precision constitutive law associated with heterogeneous deformation behavior,the thermo-mechanical coupling algorithm associated with tool-chip friction,the configurations of individual phases in line with real microstructural characteristics of composite materials,and the integration of external energetic fields into cutting models,are ***,insights into the future development of advanced numerical simulation techniques for diamond cutting of advanced structured materials are also *** aspects reported in this review present guidelines for the numerical simulations of ultra-precision mechanical machining responses for a variety of materials.

关键词： diamond cutting ultra-smooth surface material-oriented physics-based simulation model molecular dynamics finite element

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Composition-dependent micro-structure and photocatalytic performance of g-C_(3)N_(4) quantum dots@SnS2 heterojunction

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Nano Research 2021年第11期14卷 4188-4196页

作者： Sheng-Qi Guo Haijun Zhang Zhenzhong Hu Mengmeng Zhen Bo Yang Boxiong Shen Fan Dong Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401China Center for Aircraft Fire and Emergency Department of Safety EngineeringCivil Aviation University of ChinaTianjin300300China Yangtze Delta Region Institute(Huzhou) &Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaHuzhou313001China Institute of Advanced Technology University of Science and Technology of ChinaHefei230088China

Semiconductor combination is one of the most common strategies to obtain high-efficiency photocatalysts;however, the effect mechanism of composition ratio on micro-structure and photocatalytic activity is remaining unclear. In this study, a case of g-C_(3)N_(4) quantum dots@SnS_(2) (CNQDn@SnS_(2)) heterojunction with different ratio of CNQD is used to uncover the origin of optimum and excess composition for photocatalysts. Research on the functional mechanism of the optimum composition shows that 0.8 wt.% CNQD are completely attached to the non-(001) facets of SnS_(2), which benefits the formation of type-II heterojunction, resulting in an optimal pollutant degradation and mineralization efficiency. For the excess composition, both experiments and theoretical calculations confirm that excess CNQD (the part exceeding of 0.8 wt.%) located on the (001) facet of SnS_(2), leading to the type-I band alignment of this heterojunction, which severely restricts the separation of photo-induced charge carriers, and thus reduces their lifetime. This work makes the functional mechanism of composition ratio on micro-structure and photocatalytic activity clearer. Related research results provide a new insight into semiconductor combination study and take an important step toward the rational design of highly active photocatalysts.

关键词： heterojunction semiconductor combination composition ratio photocatalyst functional mechanism

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Review of electrochemical degradation of phenolic compounds

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1413-1428页

作者： You Xue Xi Hu Qian Sun Hong-yang Wang Hai-long Wang Xin-mei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation Chinese Academy of Environmental PlanningBeijing 100012China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

Phenolic compounds are widely present in domestic and industrial sewage and have serious environmental *** oxidation(EO)is one of the most promising methods for sewage degradation because of its high efficiency,environmental compatibility,and *** this work,we present an in-depth overview of the mechanism and factors affecting the degradation of phenolic compounds by *** particular,the effects of treatment of phenolic compounds with different anode materials are discussed in *** non-active anode shows higher degradation efficiency,less intermediate accumulation,and lower energy consumption than the active *** combined with other treatment methods(biological,photo,and Fenton)presents advantages,such as low energy consumption and high degradation ***-while,the remaining drawbacks of the EO process in the phenolic compound treatment system have been ***,future re-search directions are put forward to improve the feasibility of the practical application of EO technology.

关键词： electrochemical oxidation phenolic compounds degradation mechanism anode material

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DPA-2:a large atomic model as a multitask learner

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npj Computational Materials 2024年第1期10卷 185-199页

作者： Duo Zhang Xinzijian Liu Xiangyu Zhang Chengqian Zhang Chun Cai Hangrui Bi Yiming Du Xuejian Qin Anyang Peng Jiameng Huang Bowen Li Yifan Shan Jinzhe Zeng Yuzhi Zhang Siyuan Liu Yifan Li Junhan Chang Xinyan Wang Shuo Zhou Jianchuan Liu Xiaoshan Luo Zhenyu Wang Wanrun Jiang Jing Wu Yudi Yang Jiyuan Yang Manyi Yang Fu-Qiang Gong Linshuang Zhang Mengchao Shi Fu-Zhi Dai Darrin M.York Shi Liu Tong Zhu Zhicheng Zhong Jian Lv Jun Cheng Weile Jia Mohan Chen Guolin Ke Weinan E Linfeng Zhang Han Wang AI for Science Institute BeijingP.R.China DP Technology BeijingP.R.China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijingP.R.China State Key Lab of Processors Institute of Computing TechnologyChinese Academy of SciencesBeijingP.R.China University of Chinese Academy of Sciences BeijingP.R.China HEDPS CAPTCollege of EngineeringPeking UniversityBeijingP.R.China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingboP.R.China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Chinese Academy of SciencesNingboP.R.China School of Electronics Engineering and Computer Science Peking UniversityBeijingP.R.China Shanghai Engineering Research Center of Molecular Therapeutics&New Drug Development School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghaiP.R.China Laboratory for Biomolecular Simulation Research Institute for Quantitative Biomedicine and Department of Chemistry and Chemical BiologyRutgers UniversityPiscatawayNJUSA Department of Chemistry Princeton UniversityPrincetonNJUSA College of Chemistry and Molecular Engineering Peking UniversityBeijingP.R.China Yuanpei College Peking UniversityBeijingP.R.China School of Electrical Engineering and Electronic Information Xihua UniversityChengduP.R.China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchunP.R.China Key Laboratory of Material Simulation Methods&Software of Ministry of Education College of PhysicsJilin UniversityChangchunP.R.China International Center of Future Science Jilin UniversityChangchunP.R.China Key Laboratory for Quantum Materialsof Zhejiang Province Department of PhysicsSchool of ScienceWestlake UniversityHangzhouP.R.China Atomistic Simulations Italian Institute of TechnologyGenovaItaly State Key Laboratory of Physical Chemistry of Solid Surface iChEMCollege of Chemistry and Chemical EngineeringXiame

The rapid advancements in artificial intelligence(AI)are catalyzing transformative changes in atomic modeling,simulation,and ***-driven potential energy models havedemonstrated the capability to conduct large-scale,long-duration simulations with the accuracy of ab initio electronic structure ***,the model generation process remains a bottleneck for large-scale *** propose a shift towards a model-centric ecosystem,wherein a large atomic model(LAM),pretrained across multiple disciplines,can be efficiently fine-tuned and distilled for various downstream tasks,thereby establishing a new framework for molecular *** this study,we introduce the DPA-2 architecture as a prototype for ***-trained on a diverse array of chemical and materials systemsusing a multi-task approach,DPA-2demonstrates superior generalization capabilities across multiple downstream tasks compared to the traditional single-task pre-training and fine-tuning *** approach sets the stage for the development and broad application of LAMs in molecular and materials simulation research.

关键词： DPA establishing thereby

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Research on key Technologies of Cross-domain Guidance 8

Research on Key Technologies of Cross-domain Guidance

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Guo, Xiaoyun Wu, Chengfeng Fang, Xueli Xu, Cheng Li, Hui Beijing Institute of Mechanical and Electrical Engineering Beijing China Beijing Institute of Mechanical and Electrical Engineering Science and Technology on Complex System Control and Intelligent Agent Cooperative Laboratory Beijing China Beijing Institute of Mechanical and Electrical Engineering Key Laboratory of Complex Aviation Simulation System Beijing China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Cross-domain synergy and intelligence will become important features of future warfare. Cross-domain guidance is one of the typical forms of cross-domain synergy. It can significantly improve the ability to respond quickly to random targets and time-sensitive targets and enhance the anti-jamming ability in the case of confrontation. This article introduces the concept and winning mechanism of cross-domain guidance, analyzes the research progress of cross-domain guidance at home and abroad, combs the key technologies of cross-domain guidance, summarizes the current challenges and problems in cross-domain guidance research, and proposes development suggestions. © 2022 SPIE

关键词： Optical engineering

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Magnetostriction and magnetization of <110> oriented Tb0.27Dy0.73Fe1.95 alloys with different compressive prestresses

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Rare Metals 2020年第2期39卷 176-180页

作者： Xing Mu Hai-Jun Tang Xue-Xu Gao Xiao-Qian Bao Ji-Heng Li State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China China Academy of Civil Aviation Science and Technology Beijing100028China

oriented Tb0.27Dy0.73Fe1.95 alloys were studied under different applied compressive *** saturation magnetostriction by 500×10-6 is obtained for the sample under 5 MPa than that under no applied *** understand th... 详细信息

<110> oriented Tb0.27Dy0.73Fe1.95 alloys were studied under different applied compressive *** saturation magnetostriction by 500×10-6 is obtained for the sample under 5 MPa than that under no applied *** understand the effect of prestress on the magnetostrictive coefficient,differential magnetostrictive coefficient,relative permeability and coercive force were studied in *** results show that the maximum differential magnetostrictive coefficient is about 37 x 10-9 m·A-1,about two times that without *** addition,the saturation magnetostriction coefficient increases gradually with the stress increasing,while the maximum differential magnetostrictive coefficient *** saturation inductions under different stresses are similar to a value of about 1.1 *** relative permeability decreases with stress increasing.

关键词： Tb-Dy-Fe Compressive prestress Magnetostriction

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Tuning the oxidation state of Ru to surpass Pt in hydrogen evolution reaction

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Nano Research 2021年第11期14卷 4321-4327页

作者： Rongpeng Ma Ying Wang Guoqiang Li Long Yang Shiwei Liu Zhao Jin Xiao Zhao Junjie Ge Wei Xing State Key Laboratory of Electroanalytical Chemistry Laboratory of Advanced Power SourcesChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China State Key Laboratory of Automotive Simulation and Control School of Materials Science and Engineering Key Laboratory of Automobile Materials of MOEJilin UniversityChangchun130012China

The high price of state-of-the-art Pt electrocatalysts has plagued the acidic water electrolysis technique for decades. As a cheaper alternative to Pt, ruthenium is considered an inferior hydrogen evolution reaction (HER) catalyst than Pt due to its high susceptibility to oxidation and loss of activity. Herein, we reveal that the HER activity on Ru based catalysts could surpass Pt via tuning Ru oxidation state. Specifically, RuP clusters encapsulated in few layers of N, P-doped carbon (RuP@NPC) display a minimum over potential of 15.6 mV to deliver 10 mA·cm^(−2). Moreover, we for the first time show that a Ru based catalyst could afford current density up to 4 A·cm^(−2) in a practical water electrolysis cell, with voltage even lower than the Pt/C-based cell, as well as high robustness during 200 h operation. Using a combination of experiment probing and calculation, we postulate that the suitably charged Ru (∼ +2.4) catalytic center is the origin for its superior catalytic behavior. While the moderately charged Ru is empowered with optimized H adsorption behavior, the carbon encapsulation layers protect RuP clusters from over oxidation, thereby conferring the catalyst with high robustness.

关键词： RuP clusters Ru oxidation state hydrogen evolution encapsulating/confining layers

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Summary of Lagrangrian Transport Models of Radionuclides in the Marine Environment 30

Summary of Lagrangrian Transport Models of Radionuclides in ...

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30th International Conference on Nuclear Engineering, ICONE 2023

作者： Qu, Zhengzhe Nie, Baojie Wang, Liang Fan, Zhixiang Fu, Jia Fan, Qunchao Xie, Feng Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment Beijing100082 China State Environmental Protection Key Laboratory of Nuclear and Radiation Safety Regulatory Simulation and Validation Beijing100082 China School of Physics and Chemistry Research Center for Advanced Computation Xihua University Chengdu610039 China

ISBN: (纸本)9784888982566

The transport of radionuclides in the marine has been a hot issue of social concern since the Fukushima accident, especially the Japanese government announced to discharge the wastewater from Fukushima Daiichi Nuclear Power Plant (FDNPP) into Pacific Ocean in 2021, which can directly affect the environment and human health. Regarding inland nuclear power plants, freshwater habitats such as reservoirs and rivers could also be polluted by the radioactive effluents. An adequate model is expected to be instrumental in assessing radioactive pollution in various water environments. Scientists have proposed various models to simulate the advection and diffusion of radionuclides released by the Fukushima nuclear accident in the marine in different marine environmental conditions. In this study, the behaviors of radionuclides in water bodies are introduced, including advection, turbulent mixing, decay, and interaction with sedimentss and biota. The processes of Lagrangian models, which are commonly used to simulate the transport of radionuclides in the marine, are explained in detail. The research progress and application examples of radionuclide transport models in rivers and marines in recent years are systematically summarized. Current research can provide suggestions for the development of numerical models for describing the transport behavior of radionuclides in the marine environment. © 2023 by JSME.

关键词： Radioisotopes

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Super-Resolution Stress Imaging for Terahertz-Elastic Based on SRCNN

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Optics and Photonics Journal 2022年第11期12卷 253-268页

作者： Delin Liu Zhen Zhen Yufen Du Ka Kang Haonan Zhao Chuanwei Li Zhiyong Wang Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Institute of Aeronautical Materials Beijing China Department of Mechanics Tianjin University Tianjin China

Limited by diffraction limit, low spatial resolution is one of the shortcomings of terahertz imaging. Low spatial resolution is also one of the reasons limiting the development of stress measurement using terahertz imaging. In this paper, the full-field stress measurement using Terahertz Time Domain Spectroscopy (THz-TDS) is combined with Super-Resolution Convolutional Neural Network (SRCNN) algorithm to obtain stress fields with high spatial resolution. A modulation model from a plane stress state to a THz-TDS signal is constructed. A large number of simulated sets are obtained to train the SRCNN model. By applying the trained SRCNN model to imaging the numerical and physical stress fields, the improved spatial resolution of stress field calculated from the captured THz-TDS signal is obtained.

关键词： THz-TDS Stress Measurement Super-Resolution Convolutional Neural Network

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