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Deformation-induced interfacial-twin-boundary ω-phase in an Fe_(48)Mn_(37)Al_(15) body-centered cubic metastable alloy

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Journal of materials science & Technology 2023年第15期146卷 252-258页

作者： Huabei Peng Xiao Yang Lixin Sun Liqiu Yong Jiazhen Yan Jinyong Zhang Bingnan Qian Yuhua Wen School of Mechanical Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU ChongqingChongqing 401135China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China

Omega(ω)phase has a trigonal or hexagonal crystal structure and was first discovered inβ-type Ti-Cr alloys[1].Since then,theω-phase has been widely reported in numerous group IV transition metal(Ti,Ta,Hf,and Zr)based alloys[2–9].The morphologies ofω-phase could be particle-like(athermalω-phase)[10],ellipsoidal or cuboidal after aging(isothermalω-phase)[11],and plate-like after deformation(stress-relatedω-phase)[12].Amongst,the stressrelatedω-phase is usually located at the twinning boundary,thus also called interfacial-twin-boundary-ω(ITB-ω)*** formation of the ITB-ωphase is considered to be related to the formation of{112}bcc<111>mechanical twin(i.e.,{112}bcc twin)in bodycentered cubic(BCC)metals and alloys[13].

关键词： alloys alloy deformation

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On the Lüders band formation and propagation in NiTi shape memory alloys

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Journal of materials science & Technology 2022年第21期116卷 22-29页

作者： Bashir S.Shariat Yingchao Li Hong Yang Yunzhi Wang Yinong Liu Department of Mechanical Engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA

Near-equiatomic NiTi shape memory alloys are known to exhibit Lüders-type deformation associated with a stress-induced *** studies have been conducted in the past mainly focusing on the macroscopic characteristics of the phenomenon and some theories have been proposed in the literature to explain its mechanisms,but some aspects of this phenomenon are still unclear,particularly at the microscopic *** study investigated the local strain evolution during the initiation and propagation of Lüders band in a pseudoelastic NiTi alloy during tensile deformation by means of digital image correlation(DIC)*** on the evidence collected,distinct stages of Lüders band formation and propagation are defined and the corresponding local strain rates are *** local strain rates are much higher than the global strain rate of the testing,giving insight to the mechanism of this phenomenon.

关键词： Shape memory alloy(SMA) NiTi Martensitic transformation Lüders-type deformation Lüders band Digital image correlation(DIC)

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Mechanistic model for hydrogen accelerated fatigue crack growth in a low carbon steel

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International Journal of Hydrogen Energy 2025年 136卷 722-730页

作者： Hosseini, Zahra S. Dadfarnia, Mohsen Kubota, Masanobu Nagao, Akihide Somerday, Brian P. Sofronis, Petros Ritchie, Robert O. Kyushu University 744 Moto-oka Nishi-ku Fukuoka Fukuoka819-0395 Japan University of Illinois Urbana-Champaign Department of Mechanical Science and Engineering 1206 W. Green St. UrbanaIL61801 United States Seattle University Department of Mechanical Engineering 901 12th Ave. SeattleWA98122 United States University of California Berkeley Department of Materials Science and Engineering BerkeleyCA94720 United States

Fracture by hydrogen accelerated fatigue crack growth is a severe type of environmental failure. Although fatigue crack growth has been the subject of intense investigation over several decades, a complete mechanistic and predictive model is still lacking. Such a crack growth model is even more rare in the case of hydrogen in view of the lack also of constitutive models for material deformation under cycling loading that account for the hydrogen effect. In this study, we present a model for fatigue crack propagation induced by alternating crack tip plastic blunting and re-sharpening, which in the presence of hydrogen can be accelerated by hydrogen enhanced dislocation motion and generation. The Chaboche constitutive model, which is a nonlinear kinematic hardening model capable of capturing many features of material behavior under cyclic loading, is used for the calculation of the stress and strain fields at the propagating crack tip. The Chaboche model is calibrated using a sequence of experimental data from uniaxial strain-controlled cyclic loading tests and uniaxial stress-controlled ratcheting tests with a low carbon steel, JIS SM490YB, in the absence and presence of hydrogen. The numerical simulation results indicate that the proposed crack propagation model can predict Paris law behavior and can successfully demonstrate acceleration of fatigue crack growth in the presence of hydrogen. Significantly, the profiles of the steady-state opening stress and strain ahead of the fatigue crack tip in a compact tension (C(T)) specimen were found to have sections over which they vary as ln(1/r) with distance r from the crack tip, consistent with the crack-tip strain field for a non-stationary crack. © 2024

关键词： Crack tips

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Experimental Construction of Mohr–Coulomb Model for Green Sand Mold by Direct Shear Test Eliminating Effect of Wall Friction

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International Journal of Metalcasting 2025年 1-11页

作者： Okimura, Yasuhiko Kumaki, Takumi Yoshida, Hideki Nishi, Kohei Kato, Noriyuki Tokunaga, Koji Hashimoto, Kunihiro Matsuura, Makoto Koroyasu, Sadatoshi Komine, Hideo Maeda, Yasuhiro Okane, Toshimitsu Miyashita, Tomoyuki Yoshida, Makoto Department of Modern Mechanical Engineering Graduate School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan SINTOKOGIO Ltd Aichi Nagoya450-6424 Japan Faculty of Science and Engineering Department of Mechanical and Precision Systems Teikyo University Tochigi Utsunomiya320-8551 Japan Department of Civil and Environmental Engineering School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Department of Mechanical Engineering School of Engineering Daido University Aichi Nagoya457-8530 Japan Faculty of Technologists Department of Manufacturing Technologists Institute of Technologists Saitama Gyoda361-0038 Japan Department of Modern Mechanical Engineering School of Creative Science and Engineering Waseda University Tokyo Shinjuku169-8555 Japan Kagami Memorial Research Institute for Materials Science and Technology Waseda University Tokyo Shinjuku169-0051 Japan Tajima Light Metal Co. Ltd. Saitama Hanyu Japan

This paper performed the direct shear test for a green sand mold to construct the Mohr–Coulomb (MC) model as a mechanical model of the green sand mold, which is essential to predict the casting deformation by computer simulation. It is generally known that the pressure loaded on the test piece is not fully transmitted to its shear plane in the direct shear test because of the friction between the test piece and the shear box. A previous study estimated the vertical stress on the shear plane from the pressure transmission coefficient measured when the test piece was not sheared. However, this method ignored the change in the value and direction of the wall friction due to the dilatancy of the test piece during shearing. The present paper determines the values of the material constants in the MC model by two methods: by eliminating the effect of the wall friction during shearing and by ignoring that effect. In the prior method, the vertical stress on the shear plane is directly measured throughout the test by the load cell attached below the test piece. As a result, when the wall friction effect during shearing is not eliminated, the strength of the test piece was evaluated to be twice as large as that obtained eliminating the wall friction effect. With the MC model ignoring the wall friction, the computer simulation to predict the casting deformation will estimate the unrealistically high strength of the mold, leading to an erroneous prediction of the casting deformation. © The Author(s) 2025.

关键词： Bulk Density

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Automated classification of big X-ray diffraction data using deep learning models

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npj Computational materials 2023年第1期9卷 169-180页

作者： Jerardo E.Salgado Samuel Lerman Zhaotong Du Chenliang Xu Niaz Abdolrahim Materials Science program University of RochesterRochesterNew York 14627USA Department of Computer Science University of RochesterRochesterNew York 14627USA Department of Mechanical Engineering University of RochesterRochesterNew York 14627USA Laboratory for Laser Energetics University of RochesterRochesterNew York 14627USA

In current in situ X-ray diffraction(XRD)techniques,data generation surpasses human analytical capabilities,potentially leading to the loss of *** techniques require human intervention,and lack the performance and adaptability required for material *** the critical need for high-throughput automated XRD pattern analysis,we present a generalized deep learning model to classify a diverse set of materials’crystal systems and space *** our approach,we generate training data with a holistic representation of patterns that emerge from varying experimental conditions and crystal *** also employ an expedited learning technique to refine our model’s expertise to experimental *** addition,we optimize model architecture to elicit classification based on Bragg’s Law and use evaluation data to interpret our model’s *** evaluate our models using experimental data,materials unseen in training,and altered cubic crystals,where we observe state-of-the-art performance and even greater advances in space group classification.

关键词： Automate classify cubic

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Additive manufacturing of sustainable biomaterials for biomedical applications

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Asian Journal of Pharmaceutical sciences 2023年第3期18卷 1-36页

作者： Zia Ullah Arif Muhammad Yasir Khalid Reza Noroozi Mokarram Hossain Hao Tian Harvey Shi Ali Tariq Seeram Ramakrishna Rehan Umer Department of Mechanical Engineering University of Management&Technology LahoreSialkot Campus 51041Pakistan Department of Aerospace Engineering Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates School of Mechanical Engineering Faculty of EngineeringUniversity of TehranTehranIran Zienkiewicz Centre for Computational Engineering(ZCCE) Faculty of Science and EngineeringSwansea UniversitySwansea SA18ENUK Department of Mechanical&Materials Engineering Western UniversityOntario N6A 3K7Canada Department of Mechanical Engineering Center for Nanofibers and NanotechnologyNational University of Singapore119260Singapore

Biopolymers are promising environmentally benign materials applicable in multifarious *** are especially favorable in implantable biomedical devices thanks to their excellent unique properties,including bioactivity,renewability,bioresorbability,biocompatibility,biodegradability and *** manufacturing(AM)is a flexible and intricate manufacturing technology,which is widely used to fabricate biopolymer-based customized products and structures for advanced healthcare ***-dimensional(3D)printing of these sustainable materials is applied in functional clinical settings including wound dressing,drug delivery systems,medical implants and tissue *** present review highlights recent advancements in different types of biopolymers,such as proteins and polysaccharides,which are employed to develop different biomedical products by using extrusion,vat polymerization,laser and inkjet 3D printing techniques in addition to normal bioprinting and four-dimensional(4D)bioprinting *** also incorporates the influence of nanoparticles on the biological and mechanical performances of 3D-printed tissue scaffolds,and addresses current challenges as well as future developments of environmentally friendly polymeric materials manufactured through the ***,there is a need for more focused research on the adequate blending of these biodegradable biopolymers for achieving useful results in targeted biomedical *** envision that biopolymer-based 3D-printed composites have the potential to revolutionize the biomedical sector in the near future.

关键词： 3D printing Biopolymers Biomedical Tissue engineering Sustainable biomaterials Additive manufacturing

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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Rare Metals 2022年第1期41卷 96-105页

作者： Jin-Jin Zhao Xiao Su Zhou Mi Ying Zhang Yan-Jun Hu Hua-Jun Guo Yi-Nan Jiao Yu-Xia Zhang Yan Shi Wei-Zhong Hao Jing-Wei Wu Yi Wang Cun-Fa Gao Guo-Zhong Cao School of Materials Science and Engineering School of Mechanical EngineeringShijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Hebei Key Laboratory of Material Near Net Forming TechnologyHebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation *** this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n... 详细信息

关键词： Lithium ions Ni^(3+) Oxidized defect Photocurrent Perovskite solar cells

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Anomalous{1012}tensile twinning and subsequent detwinning in a friction stir processed carbon fiber-reinforced Mg composite

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Journal of Magnesium and Alloys 2024年第4期12卷 1511-1517页

作者： Wei Zhao Zhihao Jiang Xiang Wu Yujing Liu Haokun Yang Jun Wang Qi Liu Xiaochun Liu Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of Mechanical Engineering City University of Hong KongHong KongChina Smart manufacturing division Hong Kong Productivity CouncilHong Kong SAR 999077China Institute for Frontier Materials Deakin UniversityGeelongVIC 3216Australia Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina

*** text Owing to their low density and high specific strength,magnesium alloys and magnesium-based composites have great potential as structure metal materials in applications where lightweight matters[1–4].Deformation twins[5],especially the{1012}tension twins(also called tensile or extension twins)with a low critical resolved shear stress(CRSS)[6],are commonly observed in Mg *** can provide the much-needed deformation along the c-axis in their hcp structure resulting from the very few easily activated slip systems in this crystal structure[7].The tensile twinning activation usually follows the macroscopic Schmid factor law[2],i.e.,the twin variant with the highest Schmid factor occurs,and it only appears when its Schmid factor is positive.

关键词： friction deformation magnesium

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Recent progress of interface modification of layered oxide cathode material for sodium-ion batteries

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Electron 2024年第2期2卷 98-122页

作者： Luyi Sun Jun Zeng Xuanhong Wan Chenxi Peng Jiarui Wang Chongjia Lin Min Zhu Jun Liu Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Materials Science and EngineeringSouth China University of TechnologyGuangzhouChina Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyHong KongChina

With the advantages of similar theoretical basis to lithium batteries,relatively low budget and the abundance of sodium resources,sodium ion batteries(SIBs)are recognized as the most competitive alternative to lithium-ion *** various types of cathodes for SIBs,advan-tages of high theoretical capacity,nontoxic and facile synthesis are introduced for layered transition metal oxide cathodes and therefore they have attracted huge ***,layered oxide cathodes suffer from various degradation *** these issues,interface instability including surface residues,phase transitions,loss of active transition metal and oxygen loss takes up the major part of the degra-dation of layered *** degradation mechanisms usually lead to irreversible structure collapse and cracking generation,which signifi-cantly influence the interface stability and electrochemical performance of layered *** review briefly introduces the background of researches on layered cathodes for SIBs and their basic structure *** the origins and effects on layered cathodes of degradation mech-anisms are systematically ***,we will summarize various interface modification methods including surface engineering,doping modification and electrolyte composition which are aimed to improve interface stability of layered cathodes,perspectives of future research on layered cathodes are mentioned to provide some theoretical proposals.

关键词： interface modification interface stability layered oxides sodium ion batteries surface coating

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Analysis of Temiki (Melastoma Candidum) Extract Compounds as Corrosion Inhibitors Using GC–MS 4th

Analysis of Temiki (Melastoma Candidum) Extract Compounds as...

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4th International Conference on Experimental and Computational Mechanics in engineering, ICECME 2022

作者： Supardi, Joli Rizal, Samsul Ali, Nurdin Fonna, Syarizal Ikramullah, Ikramullah Arifin, A.K. Doctoral Program School of Engineering Post Graduate Program Syiah Kuala University Banda Aceh23111 Indonesia Department of Mechanical Engineering Teuku Umar University Meulaboh23615 Indonesia Department of Mechanical and Industrial Engineering Syiah Kuala University Banda Aceh23111 Indonesia Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia Selangor DE Bangi43600 Malaysia

ISBN: (纸本)9789819974948

Temiki (Melastoma Candidum) is one of the unutilized wild plants observed to be turning pests on plantations. It has only been used for medicine and not for engineering purposes. Therefore, this study aims to identify and analyze Temiki’s chemical compounds, which are useful as corrosion inhibitors. The plant was washed, dried, then blended until it became a fine powder, and was further extracted by employing the maceration method with ethanol as solvent. The extracted compounds were also analyzed using Gas Chromatography-Mass Spectrophotometry (GC–MS) and the results obtained include, 2-Furancarboxaldehyde (CAS) Furfural, 1,2,3-Propanetriol (CAS) Glycerol, Acetic acid,1-(2-methyltetrazole-5-yl) etheny, 4H-Pyran-4one,2,3-dihydro-3,5-dihydroxy, 5-Hydroxymethylfurfural, cis-dimethylmorpholine, 3-penten-1-ol,2,2,4-trimethyl-(CAS)2,2,4, 2-AMINO-9-(3,4-DIHYDROXY-5-HYDORO, D-Allose, beta-D-Glucopyranoside, methyl, Hexadecanoic acid, methyl ester, 9,12,15-Octadecatrienoic acid, methyl ester. In conclusion, these chemical compounds were useful as corrosion inhibitors. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Corrosion

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