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recent progress of hafnium oxide-based ferroelectric devices for advanced circuit applications

Science China(Information Sciences) 2023年第10期66卷 84-104页

作者： Zhaohao ZHANG Guoliang TIAN Jiali HUO Fang ZHANG Qingzhu ZHANG Gaobo XU Zhenhua WU Yan CHENG Yan LIU Huaxiang YIN Integrated Circuit Advanced R&D Center Institute of Microelectronics of Chinese Academy of Sciences School of Integrated Circuits University of Chinese Academy of Sciences School of Microelectronics Xidian University Department of Electronics East China Normal University

Hafnium oxide-based ferroelectric field-effect-transistors(FeFET), which combine super-steep logical switching and low power non-volatile memory functions, have significant potential for post-Moore integrated circuit innovations with higher energy efficiency and larger integration scale. In this review, recent research into hafnium oxide-based ferroelectric(FE) films and different functional devices is presented,from fundamentals to applications. different technological challenges and state-of-the-art research and development efforts related to the physical understanding and performance optimization of FE films, advanced hafnium oxide-based device integration, and device applications in logic-in-memory and artificial synapses and neurons for neuromorphic computing are addressed.

关键词： ferroelectric FeFET hafnium oxide HZO logic-in-memory neuromorphic computing

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ENVIrONMENTALLY FrIENdLY ACOUSTIC PANEL design FrOM CUrTAIN WASTE

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Tekstil ve Muhendis 2023年第131期30卷 253-259页

作者： AÇIKGÖZ, Gamze AYdIN, Onur ALTUĞ, Alp Yaman SEZGİN, Hande ENİŞ, İpek Yalçın Oba Perdesan Perde Sanayi A.Ş R&D Department Istanbul Turkey Inovista Activated Carbon and Advanced Mat. Tech. Ltd R&D Department Ankara Turkey ITU Faculty of Textile Technologies and Design Textile Engineering Department Istanbul Turkey

Using leftover industrial curtain fabrics, this study aims to develop environmentally friendly acoustic panels. In this context, two forms of curtain fabric waste, blackout and dimout, which are segregated as waste from post-production process within Oba Perdesan, are transformed into fiber utilizing mini shredder. The hot press method is used to produce composite samples made of 100% blackout and 50% blackout/ 50% dimout fabric waste in two different thicknesses (0.5 and 1 cm). The thickness, density, basis weight, FTIr, sound absorption coefficient, and sound transmission loss of the manufactured panels are measured. The FTIr analysis reveals the distinctive peaks of the raw materials of the structures, while the acoustic test results show that the sound absorption coefficient and sound transmission loss increase along with the thickness and basis weight of the structures, respectively. While the 1 cm blackout/dimout blend sample has a superior sound absorption coefficient for 2000 Hz with 0.81, the 1 cm 100% blackout sample performs highest with 10dB sound transmission loss. The produced panels aid in solid waste management while consuming minimal raw materials, and an essential step is taken toward the development of sustainable, practical, and decorative panels. © (2023) All rights reserved.

关键词： Sound insulating materials

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Accelerating ab initio melting property calculations with machine learning:application to the high entropy alloy TaVCrW

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npj Computational Materials 2024年第1期10卷 328-338页

作者： Li-Fang Zhu Fritz Körmann Qing Chen Malin Selleby Jörg Neugebauer Blazej Grabowski Department for Computational Materials Design Max Planck Institute for Sustainable MaterialsMax-Planck-str.140237 DüsseldorfGermany Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Interdisciplinary Centre for Advanced Materials Simulation(ICAMS) Ruhr-Universität Bochum44801 BochumGermany Thermo-Calc Software AB Råsundavägen 18SE-16967 SolnaSweden Department of Materials Science and Engineering KTH Royal Institute of TechnologySE-10044StockholmSweden

Melting properties are critical for designing novel materials,especially for discovering highperformance,high-melting refractory *** measurements of these properties are extremely challenging due to their high melting *** theoretical predictions are,therefore,*** of the most accurate approaches for this purpose is the ab initio free-energy approach based on density functional theory(dFT).However,it generally involves expensive thermodynamic integration using ab initio molecular dynamic *** high computational cost makes high-throughput calculations ***,we propose a highly efficient dFT-based method aided by a specially designed machine learning *** the machine learning potential can closely reproduce the ab initio phase-space distribution,even for multi-component alloys,the costly thermodynamic integration can be fully substituted with more efficient free energy perturbation *** method achieves overall savings of computational resources by 80%compared to current *** apply the method to the high-entropy alloy TaVCrW and calculate its melting properties,including the melting temperature,entropy and enthalpy of fusion,and volume change at the melting ***,the heat capacities of solid and liquid TaVCrW are *** results agree reasonably with the CALPHAd extrapolated values.

关键词： alloy entropy high

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Chemical ordering and magnetism in facecentered cubic CrCoNi alloy

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npj Computational Materials 2024年第1期10卷 51-60页

作者： Sheuly Ghosh Katharina Ueltzen Janine George Jörg Neugebauer Fritz Körmann Computational Materials Design Max-Planck-Institut für Nachhaltige MaterialienD-40237 DüsseldorfGermany Federal Institute for Materials Research and Testing Department Materials ChemistryUnter den Eichen 8712205 BerlinGermany Friedrich-Schiller-Universität Jena Institute of Condensed Matter Theory and OpticsMax-Wien-Platz 107743 JenaGermany Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany Interdisciplinary Centre for Advanced Materials Simulation(ICAMS) Ruhr-Universität Bochum44801 BochumGermany

The impact ofmagnetism on chemical ordering in face-centered cubic CrCoNi medium entropy alloy is studied by a combination of ab initio simulations,machine learning potentials,and Monte Carlo *** magnetic energies are revealed for some mixed L1_(2)/L1_(0) type ordered configurations,which are rooted in strong nearest-neighbor magnetic exchange interactions and chemical bonding among the constituent elements.

关键词： alloy CoNi cubic

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Thermal cycling creep properties of a directionally solidified superalloy dZ125

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Journal of Materials Science & Technology 2022年第9期104卷 269-284页

作者： Wenrui An Satoshi Utada Xiaotong Guo Stoichko Antonov Weiwei Zheng Jonathan Cormier Qiang Feng Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Institut Pprime UPR CNRS 3346Department of Physics and Mechanics of MaterialsISAE-ENSMABP4010986961 Futuroscope Chasseneuil CedexFrance China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610China Department of Microstructure Physics and Alloy Design Max-Planck-Institut für Eisenforschung GmbHDüsseldorf 40237Germany

Aero-engine turbine blades may suffer overheating during service,which can result in severe microstructural and mechanical degradation within tens of *** this study,the thermal cycling creep under(950℃/15 min+1100℃/1 min)-100 MPa was performed on a directionally solidified superalloy,*** effects of overheating and thermal cycling on the creep properties were evaluated in terms of creep behavior and microstructural evolution against isothermally crept specimens under 950℃/100 MPa,950℃/270 MPa,and 1100℃/100 *** results indicated that the thermal cycling creep life was reduced dramatically compared to the isothermal creep under 950℃/100 *** plastic creep deformation mainly occurred during the overheating stage during the thermal cycling *** thermal cycling creep curve exhibited three stages,similar to the 1100℃isothermal creep,but its minimum creep rate occurred at a lower creep *** overheating events caused severe microstructural degradation,such as substantial dissolution ofγ'phase,earlier formation of raftedγ'microstructure,widening of theγchannels,and instability of the interfacial dislocation *** microstructural degradation was the main reason for the dramatic decrease in thermal cycling creep life,as the thermal cycling promoted more dislocations to cut intoγ'phase and more cracks to initiate at grain boundaries,carbides,and residual eutectic *** study underlines the importance of evaluating the thermal cycling creep properties of superalloys to be used as turbine blades and provides insights into the effect of thermal cycling on directionally solidified superalloys for component design.

关键词： directional solidified superalloy Thermal cycling creep Overheating Creep properties Microstructural degradation

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Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V_(1-x)Cr_(x)CoNi alloys

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Journal of Materials Science & Technology 2022年第13期108卷 270-280页

作者： Hyun Chung dae Woong Kim Woo Jin Cho Heung Nam Han Yuji Ikeda Shoji Ishibashi Fritz Körmann Seok Su Sohn Department of Materials Science and Engineering Korea UniversitySeoul 02841South Korea Center for High Entropy Alloys Pohang University of Science and TechnologyPohang 37673South Korea Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National UniversitySeoul 08826South Korea Institute for Materials Science University of StuttgartPfaffenwaldring 55Stuttgart 70569Germany Computational Materials Design Max-Planck-Institut für Eisenforschung GmbHMax-Planck-Strabe 1Düsseldorf 40237Germany Research Center for Computational Design of Advanced Functional Materials(CD-Fmat) National Institute of Advanced Industrial Science and Technology(AIST)TsukubaIbaraki 305-8568Japan Department of Materials Science and Engineering Delft University of TechnologyMekelweg2Delft 2628 CDthe Netherlands

High-and medium-entropy alloys(HEAs and MEAs)possess high solid-solution *** investigations have been conducted on its impact on yield strength,however,there are limited reports regarding the relation between solid-solution strengthening and strain-hardening *** addition,no attempt has been made to account for the dislocation-mediated plasticity;most works focused on twinning-or transformation-induced plasticity(TWIP or TrIP).In this work we reveal the role of solidsolution strengthening on the strain-hardening rate via systematically investigating evolutions of deformation structures by controlling the Cr/V ratio in prototypical V_(1-x)Cr_(x)CoNi *** the TWIP of CrCoNi with the dislocation slip of V_(0.4)Cr_(0.6)CoNi,the hardening rate of CrCoNi was superior to slip-band refinements of V_(0.4)Cr_(0.6)CoNi due to the dynamic Hall-Petch ***,as V content increased further to V_(0.7)Cr_(0.3)CoNi and VCoNi,their rate of slip-band refinement in V_(0.7)Cr_(0.3)CoNi and VCoNi with high solid-solution strength surpassed that of *** it is generally accepted in conventional alloys that deformation twinning results in a higher strain-hardening rate than dislocation-mediated plasticity,we observed that the latter can be predominant in the former under an activated huge solid-solution strengthening *** high solid-solution strength lowered the cross-slip activation and consequently retarded the dislocation rearrangement rate,i.e.,the dynamic *** delay in the hardening rate decrease,therefore,increased the strain-hardening rate,results in an overall higher strain-hardening rate of V-rich alloys.

关键词： Medium-entropy alloy Tensile property Solid-solution strength Strain-hardening rate Stacking fault energy

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Phase Evolution and Thermal Expansion Behavior of aγ′Precipitated Ni-Based Superalloy by Synchrotron X-ray diffraction

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 93-102页

作者： Zhiran Yan Qing Tan Hua Huang Hailong Qin Yi rong Zhongnan Bi runguang Li Yang ren Yandong Wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Department of Microstructure Physics and Alloy Design Max-Planck-Institut Für Eisenforschung GmbH40237DüsseldorfGermany Department of Materials Imperial College LondonKensingtonLondonSW72AZUK Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing100081China Department of Mechanical Engineering Technical University of Denmark2800Kongens LyngbyDenmark X-Ray Science Division Advanced Photon SourceArgonne National LaboratoryArgonneIL60439USA

The phase evolution and thermal expansion behavior in superalloy during heating play an essential role in controlling the size and distribution of precipitates,as well as optimizing thermomechanical *** X-ray diffraction is able to go through the interior of sample and can be carried out with in situ environment,and thus,it can obtain more statistics information in real time comparing with traditional methods,such as electron and optical *** this study,in situ heating synchrotron X-ray diffraction was carried out to study the phase evolution in a typicalγ′phase precipitation strengthened Ni-based superalloy,Waspaloy,from 29 to 1050°***γ′,γ,M_(23)C_(6)and M C phases,including their lattice parameters,misfits,dissolution behavior and thermal expansion coefficients,were mainly ***γ′phase and M_(23)C_(6)carbides appeared obvious dissolution during heating and re-precipitated when the temperature dropped to room *** with the microscopy results,we can indicate that the dissolution of M_(23)C_(6)leads to the growth of grain andγ′phase cannot be completely dissolved for the short holding time above the solution ***,the coefficients of thermal expansions of all the phases are calculated and fitted as polynomials.

关键词： Superalloy Waspaloy Lattice misfit Coefficients of thermal expansion X-ray diffraction Synchrotron radiation

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Optimisation of alloy composition for highly-formable magnesium sheet

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1388-1395页

作者： Zhuoran Zeng Mingzhe Bian Shiwei Xu Weineng Tang Chris davies Nick Birbilis Jianfeng Nie College of Engineering and Computer Science Australian National UniversityACT.2601Australia Department of Materials Science and Engineering Monash UniversityVIC 3800Australia State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Research Institute(R&D Center) Baosteel Group CorporationShanghai 201999China Department of Mechanical and Aerospace Engineering Monash UniversityVIC 3800Australia

The effectiveness of Ca or Gd addition on ductility and formability of Mg-Zn-Zr based dilute alloys in deep drawing has not been systematically compared *** this study,formable Mg-Zn-Gd-Zr and Mg-Zn-Ca-Zr sheet alloys are produced by hot *** sheets have similarly weakened basal texture,but the sheet of the Mg-Zn-Gd-Zr alloys has higher ductility and formability than that of Mg-Zn-Ca-Zr *** combined addition of 0.2wt%Ca and 0.4wt%Gd to the Mg-1Zn-0.5Zr(wt%)alloy leads to a Mg-1Zn-0.4Gd-0.2Ca-0.5Zr alloy that has even better ductility,and its formability during deep drawing is comparable to the benchmark Al6016 *** increase in Ca content from 0.2wt%to 0.5wt%leads to decreased sheet ductility and formability,predominantly due to grain boundary embrittlement.

关键词： magnesium sheet alloy texture microstructure formability solute segregation

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deformable micro-supercapacitor fabricated via laser ablation patterning of Graphene/liquid metal

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npj Flexible Electronics 2024年第1期8卷 770-778页

作者： Keon-Woo Kim Seong Ju Park Su-Jeong Park Inae Kim Bomi Park Se Hyun Kim Unyong Jeong Jin Kon Kim Chanwoo Yang National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer Department of Chemical EngineeringPohang University of Science and Technology(POSTECH)PohangGyeongbuk 37763Republic of Korea Advanced Nano-Surface&Wearable Electronics Research Laboratory Heat and Surface Technology R&D DepartmentKorea Institute of Industrial TechnologyIncheon 21999Republic of Korea Division of Chemical Engineering Konkuk UniversitySeoul 05029Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37763Republic of Korea

deformable andminiaturized energy storage devices are essential for powering soft ***,we fabricate deformablemicro supercapacitors(MSCs)based on eutectic gallium-indium liquidmetal(EGaIn)current collectors with integrated *** well-define interdigitated electrode patterning with controlled gap is successfully realized by using the laser ablation because of a strong laser absorption of graphene and *** judicious control of gap size between neighboring interdigitated electrodes and mass loading of graphene,we achieve a high areal capacitance(1336μF cm^(−2))with reliable rate *** addition,owing to the intrinsic liquid characteristics of EGaIn current collector,the areal capacitance of fabricated MSC retains 90% of original value evenafter repetitive foldingand20%stretching up to 1000 ***,we successfully integrate deformable MSC with a commercial light-emitting diode to demonstrate the feasibility ofMSC as a deformable power *** fabricated MSCs operate stably under various mechanical deformations,including stretching,folding,twisting,and wrinkling.

关键词： laser stretching liquid

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decision-Making Based on reinforcement Learning and Model Predictive Control Considering Space Generation for Highway On-ramp Merging

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IFAC-PapersOnLine 2022年第27期55卷 241-246页

作者： Hikaru Kimura Masaki Takahashi Kazuhiro Nishiwaki Masahiro Iezawa Department of System Design Engineering Keio University Yokohama Japan Advanced Technology R&D Center Mitsubishi Electric Corporation

reducing traffic accidents pertaining to autonomous vehicles has garnered attention. Merging on a highway is one of the most challenging problems that must be addressed for the realization of autonomous vehicles. It is difficult because an agent must decide where to merge in a complex and ever-changing environment. Merging with congested highway traffic involves significant interaction with vehicles in the main lane. If there is no space for the autonomous vehicle to merge, it needs to work on vehicles in the main lane to create space and subsequently decide to merge or not. reinforcement learning (rL) is a promising method for solving decision-making problems. However, it is difficult to guarantee the safety of the controller obtained using rL. Therefore, we propose a combined method in which decision-making is performed by rL and vehicle control by model predictive control (MPC) to ensure safety. The performance of the proposed system is tested by simulations. The proposed system made appropriate decisions according to the situation, and by controlling the vehicle in consideration of collision avoidance constraints, it showed a high merge success rate evenin a crowded situation.

关键词： Autonomous Vehicles reinforcement learning Model predictive control Merging decision making advanced driver assistance system

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