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The influence of spark plasma sintering temperatures on the microstructure,hardness,and elastic modulus of the nanocrystalline Al-xV alloys produced by high-energy ball milling

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Journal of materials science & Technology 2022年第27期122卷 68-76页

作者： J.Christudasjustus C.S.Witharamage Ganesh Walunj T.Borkar R.K.Gupta Department of Materials Science and Engineering North Carolina State UniversityRaleighNC 27606United States Department of Mechanical Engineering Cleveland State UniversityClevelandOH 44115United States

Al-xV alloys(x=2 at.%,5 at.%,10 at.%)with nanocrystalline structure and high solid solubility of V were produced in powder form by high-energy ball milling(HEBM).The alloy powders were consolidated by spark plasma sintering(SPS)employing a wide range of temperatures ranging from 200 to 400°*** microstructure and solid solubility of V in Al were investigated using X-ray diffraction analysis,scanning electron microscope and transmission electron *** microstructure was influenced by the SPS temperature and V content of the *** alloys exhibited high solid solubility of V–six orders of magnitude higher than that in equilibrium state and grain size<50 nm at all the SPS *** formation of Al3V intermetallic was detected at 400℃.Formation of a V-lean phase and bimodal grain size was observed during SPS,which increased with the increase in SPS *** hardness and elastic modulus,measured using nanoindentation,were significantly higher than commercial *** example,Al-V alloy produced by SPS at 200℃ exhibited a hardness of 5.21 GPa along with elastic modulus of 96.21 *** evolution of the microstructure and hardness with SPS temperatures has been discussed.

关键词： Spark plasma sintering Aluminum alloys Nanocrystalline alloys High-energy ball milling Nanoindentation Hardness Elastic modulus

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Efficiently searching extreme mechanical properties via boundless objective-free exploration and minimal first-principles calculations

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npj Computational materials 2022年第1期8卷 1336-1347页

作者： Joshua Ojih Mohammed Al-Fahdi Alejandro David Rodriguez Kamal Choudhary Ming Hu Department of Mechanical Engineering University of South CarolinaColumbiaSC29208USA Materials Science and Engineering Division National Institute of Standards and TechnologyGaithersburgMD20899USA

Despite the machine learning(ML)methods have been largely used recently,the predicted materials properties usually cannot exceed the range of original training *** deployed a boundless objective-free exploration approach to combine traditional ML and density functional theory(DFT)in searching extreme material *** combination not only improves the efficiency for screening large-scale materials with minimal DFT inquiry,but also yields properties beyond original training *** use Stein novelty to recommend outliers and then verify using *** data are then added into the training dataset for next round *** test the loop of training-recommendation-validation in mechanical property *** screening 85,707 crystal structures,we identify 21 ultrahigh hardness structures and 11 negative Poisson’s ratio *** algorithm is very promising for future materials discovery that can push materials properties to the limit with minimal DFT calculations on only~1%of the structures in the screening pool.

关键词： extreme properties minimal

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The Influence of Silicon Dioxide as a Fuel Additive in a Diesel Engine Fuelled by Pure Palm Oil 4

The Influence of Silicon Dioxide as a Fuel Additive in a Die...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Prahmana, Rico Aditia Darmanto, Prihadi Setyo Reksowardojo, Iman Kartolaksono Prakoso, Tirto Juangsa, Firman Bagja Doctoral Program of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung40132 Indonesia Program Study of Mechanical Engineering Faculty of Industrial Technology Institut Teknologi Sumatera South Lampung35365 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung Indonesia Department of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Bandung40132 Indonesia Program Study of Mechanical Engineering Faculty of Industrial Technology Universitas Pertamina Jakarta12220 Indonesia

In the last decade, the Indonesian government has implemented a program to use biodiesel as a substitute for fossil diesel to reduce dependence on fossil fuels. On the other hand, the development of biodiesel as an alternative fuel to replace fossil diesel has several challenges, one of which is the production of biodiesel, which is more complicated and requires a long process. However, the direct use of crude palm oil (CPO) in diesel engines is not recommended because it has many drawbacks. Research recently shows that fuel additives in diesel engines have promising prospects. Therefore, to solve the problem, this study used pure palm oil (PPaO) as the primary fuel, with the addition of silicon oxide (SiO2) as a fuel additive in diesel engines. The results showed that using SiO2 additive in PPaO can increase thermal efficiency by 18.8% at 60% load compared to diesel fuel (DF). Nevertheless, using this fuel increased specific fuel consumption (SFC) by 3.9% on average and increased the opacity by 153% compared to diesel fuel. These results indicate that SiO2 has the potential to be developed as an effective additive to PPaO fuel that can improve the efficiency and performance of diesel engines. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Biodiesel

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A novel carbon-induced-porosity mechanism for improved cycling stability of magnesium hydride

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Journal of Magnesium and Alloys 2025年第3期13卷 1341-1352页

作者： Shuaijun Ding Yuqing Qiao Xuecheng Cai Hongchao Wang Xun Shen Lidong Xu Yixuan Wen Fenglong Jiang Wei Zhou Tongde Shen Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina

MgH_(2) has been extensively studied as one of the most ideal solid hydrogen storage ***,rapid capacity decay and sluggish hydrogen storage kinetics hamper its practical ***,a Ni/C nano-catalyst doped MgH_(2)(MgH_(2)–Ni/C)shows an improved hydrogen absorption kinetics with largely reduced activation ***,the MgH_(2)–Ni/C displays remarkable cycling stability,which maintains a high capacity of 6.01 wt.%(98.8%of initial capacity)even after 50 full hydrogen ab/desorption cycles,while the undoped MgH_(2) counterpart retains only 85.2%of its initial *** microstructure characterizations clearly reveal that particle sintering/growth accounts primarily for the deterioration of cycling performance of undoped MgH_(2).By comparison,MgH_(2)–Ni/C can maintain a stable particle size with a growing porous structure during long-term cycling,which effectively increases the speciﬁc surface of the particles.A novel carbon-induced-porosity stabilization mechanism is proposed,which can stabilize the proportion of rapid hydrogen absorption process,thus dominating the excellent cycling performance of MgH_(2)–Ni/*** study provides new insights into the cycling stability mechanism of carbon-containing Mg-based hydrogen storage materials,thus promoting their practical applications.

关键词： Hydrogen storage materials Magnesium hydride Cycling properties Particle stability Carbon-induced-porosity

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Effect of chemical composition and microstructure on the thermal conductivity of Mg-Al-Ca alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 9-13页

作者： Kirimoto, Yuichi Kondo, Natsuki Ito, Mizuki Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama-shi Toyama Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

In recent years, the increasing demand for electric vehicles, digital devices such as PCs and smartphones, and renewable energy storage systems has created a need for higher-performance batteries. Accordingly, the thermal conductivity of the case that houses the battery is becoming increasingly important. In this study, compositions with high thermal conductivity and good castability were investigated, focusing on Mg-Al-Ca alloys, and the relationship between the two was examined through thermal conductivity measurements and microstructural observations. As a result, the Mg-6%Al-4%Ca alloy was optimal in terms of castability and thermal conductivity. It was confirmed that a lower Al solid solution capacity and a higher purity of the matrix phase are important to improve the thermal conductivity. It is also suggested that the second phase, platelet Al2Ca, is likely to be recognized and enriched in the matrix, contributing to the improvement of thermal conductivity. The amount of Ca solid solution in the matrix was suggested to be reduced by the enrichment of Al in the matrix. The Ca solid solution in the matrix was found to be less effective in reducing thermal conductivity than the Al solid solution. © 2024 The Japan Institute of Light Metals.

关键词： Magnesium alloys

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Investigation on Spark Plasma Sintering of Calcareous Waste Concrete Powder and Coal Fly Ash

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2023年第11期70卷 451-460页

作者： Kanda, Yasuyuki Shinjo, Tomohide Mechanical Engineering Program School of Engineering Faculty of Engineering University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan Solid Mechanics and Materials Engineering Graduate School of Engineering and Science University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan

This paper aims to fabricate a composite material using calcareous waste concrete powder and coal fly ash (FA) by spark plasma sintering. The effect of FA addition on the mechanical properties of the composite material were investigated. The maximum FA content was 7.5 wt%. The relative density of the composite material was approximately 1.0, independent of FA content. In contrast, the Vickers hardness, flexural strength, and flexural modulus increased with increasing FA content. However, the dispersion state of FA in the composite material was not observed by scanning electron microscopy. Powder X-ray diffraction of the composite material revealed that spurrite and wollastonite were formed identically, independent of FA content. Therefore, FA serves as a reinforcement in the composite material. © 2023 Japan Society of Powder and Powder Metallurgy.

关键词： Spark plasma sintering

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The innate interfacial elastic strain field of a transformable B2 precipitate embedded in an amorphous matrix

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npj Computational materials 2023年第1期9卷 41-48页

作者： Xiaoling Fu Yujun Lin Mixun Zhu Kai Wang Jiaqing Wu Xing Tong Wenli Song Ming Jen Tan Yuanzheng Yang Jun Shen Gang Wang Chan Hung Shek Robert O.Ritchie School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Songshan Lake Materials Laboratory Dongguan 523808China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore 639798Singapore School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Institute of Materials Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering City University of Hong KongKowloon TongHong Kong SARChina Department of Materials Science&Engineering University of CaliforniaBerkeleyCA 94720USA

When a transformable B2 precipitate is embedded in an amorphous matrix,it is often experimentally observed that the crystalline-amorphous interface not only serves as an initiation site for the martensitic transformation due to local stress concentrations,but also as an inhibitor to stabilize the transformation,the latter being attributed to the“confinement effect”exerted by the amorphous matrix,according to the Eshelby *** two seemingly incongruous factors are examined in this study using molecular dynamics simulations from an atomic interaction *** innate strain gradient in the vicinity of the crystalline-amorphous interface is *** actual interface,the compressive/dilatative transition,and the interfacial maximum strain are investigated to differentiate from the conventional“interface”located within a distance of a few *** innate interfacial elastic strain field model is applicable for the design of materials with a higher degree of martensitic transformation and controllable stress concentration,even in cryogenic environments.

关键词： strain transformation martensitic

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A homologous strategy to parallelly construct doped MOFs-derived electrodes for flexible solid-state hybrid supercapacitors

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Nano Research 2023年第8期16卷 10890-10898页

作者： Yi-Lin Liu Ling Wang Qingyi Zeng Qi Kang Cheng Yan College of Mechanical Engineering University of South ChinaHengyang 421001China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Chemistry Faculty of ScienceThe University of SydneySydney 2006Australia

Developing efficient and cost-effective electrode materials is of essential significance to advance various energy storage technologies,among which flexible supercapacitors hold great promise to meet the growing popularity of wearable ***,we report a homologous strategy to parallelly synthesize phosphorus-doped ZnCo_(2)O_(4)(P-ZnCo_(2)O_(4)@NCC)and nitrogen-doped carbon(NC@NCC)both derived from ZnCo-metal-organic frameworks(MOFs)precursors in-situ grown on dopamine-modified carbon cloth(NCC)as conductive ***,the as-obtained P-ZnCo_(2)O_(4)@NCC can achieve a high specific capacitance of 2702.2 mF∙cm^(−2)at 1 mA∙cm^(−2)with the capacitance retention rate exceeding 70.6%at 10 mA∙cm^(−2),demonstrating the outstanding rate ***,flexible solid-state hybrid supercapacitors,using P-ZnCo_(2)O_(4)@NCC as positive electrode and NC@NCC as negative electrode,are assembled with poly(vinyl alcohol)(PVA)/KOH as the gel electrolyte,which deliver the energy density of 11.9 mWh∙cm^(−3)when the power density reaches up to 47.3 mW∙cm^(−3).In addition,85.15%of the initial specific capacitance is maintained after 5000 continuous cycles and no obvious capacitance decay is observed under different bending conditions,revealing the excellent cycling stability and *** a proof-of-concept demonstration,two as-assembled hybrid supercapacitors connected in series can light up a red light-emitting diode(LED)under the bending angle of 180°,heralding the feasibility for broad practical applications.

关键词： homologous synthesis heteroatom-doping metal-organic frameworks energy storage flexible solid-state devices

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Modeling and Prediction of Fatigue Properties of Additively Manufactured Metals

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Acta Mechanica Solida Sinica 2023年第2期36卷 181-213页

作者： Wei Tang Ziming Tang Wenjun Lu Shuai Wang Min Yi State Key Lab of Mechanics and Control of Mechanical Structures&Institute for Frontier Science&Key Lab for Intelligent Nano Materials and Devices of Ministry of Education&College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China

Additive manufacturing(AM)has emerged as an advanced technique for the fabrication of complex near-net shaped and lightweight metallic parts with acceptable mechanical *** strength of AM metals has been confirmed comparable or even superior to that of metals manufactured by conventional processes,but the fatigue performance is still a knotty issue that may hinder the substitution of currently used metallic components by AM counterparts when the cyclic loading and thus fatigue failure *** essential complements to high-cost and time-consuming experimental fatigue tests of AM metals,models for fatigue performance prediction are highly *** this review,different models for predicting the fatigue properties of AM metals are summarized in terms of fatigue life,fatigue limit and fatigue crack growth,with a focus on the incorporation of AM characteristics such as AM defect and processing parameters into the *** predicting the fatigue life of AM metals,empirical models and theoretical models(including local characteristic model,continuum damage mechanics model and probabilistic method)are *** terms of fatigue limit,the introduced models involve the Kitagawa–Takahashi model,the Murakami model,the El-Haddad model,*** modeling the fatigue crack growth of AM metals,the summarized methodologies include the Paris equation,the Hartman-Schijve equation,the NASGRO equation,the small-crack growth model,and numerical *** of these models for AM metals are similar to those for conventionally processed materials,but are modified and pay more attention to the AM ***,an outlook for possible directions of the modeling and prediction of fatigue properties of AM metals is provided.

关键词： Additive manufacturing Fatigue properties Metals Modeling and prediction Microstructure

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Effect of pore geometry on properties of high-temperature oxidized additively manufactured magnesium scaffolds

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Journal of Magnesium and Alloys 2024年第11期12卷 4509-4520页

作者： Chaoxin Wang Shuyuan Min Jinge Liu Bingchuan Liu Bo Peng Caimei Wang Xiaolin Ma Peng Wen Yufeng Zheng Yun Tian Department of Orthopedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Only a few studies have examined how pore geometry affects the mechanical characteristics, biological behavior, and degradation of additively manufactured biodegradable porous magnesium. In this work, the effects of pore geometry on mechanical qualities, degradation,and biological behavior were investigated using three typical porous architectures with the same porosity. The porous structures were found to satisfy bone tissue engineering requirements because they had sufficient degradation resistance and tunable compressive characteristics. All three types of magnesium alloy scaffolds exhibited good biocompatibility. Additionally, the magnesium alloy porous structures influenced the magnesium scaffold material degradation rate and the surrounding environment, impacting the osteogenic differentiation of bone mesenchymal stem cells and bone tissue regeneration. This work offers conceptual support for optimizing pore geometry to alter the mechanical and degradable characteristics of additively manufactured porous magnesium to meet therapeutic demands.

关键词： Pore geometry Additive manufacturing WE43 alloy Magnesium alloy

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