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P-13.6: Defect Analysis and Structure Optimization of Rollable OLED Screen

SID Symposium Digest of Technical Papers 2022年第S1期53卷

作者： Wenjing Peng Dunming Liao Zhiqing Xia Di Wu State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

In the flexible OLED (organic light-emitting diodes) screen rolling process, there are some defects such as waviness, fracture, adhesive layer peeling and so on. This paper discussed the effects of factors such as the rotating radius and velocity of scroll, the thickness and modulus of screen stacking structure on the above defects, so as to provide guidance for the structural optimization of OLED screen.

关键词： Numerical Simulation Flexible OLED Screen Rolling Defects Fracture Adhesive Peeling

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Reactive hot-pressing of ultrafine dual phase high-entropy (Ti,Zr,Hf,Nb,Ta)C-SiC ceramics with enhanced mechanical properties

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Ceramics International 2025年

作者： Ruiqing Zhao Boxin Wei Liwei Wang Jia Yao Lei Chen Yujin Wang School of Materials Science and Chemical Engineering Harbin University of Science and Technology Harbin 150040 China Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification and Green Forming Technology Harbin University of Science and Technology Harbin 150040 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China Institute for Advanced Ceramics School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology Harbin Institute of Technology Harbin 150001 China

Ultrafine (submicron-scale) dual-phase high-entropy (Ti,Zr,Hf,Nb,Ta)C-SiC ceramics were successfully synthesized at significantly reduced temperatures (1500 – 1700 °C) through in-situ reactive hot-pressing of nanoscale high-entropy carbide and silicon powders. The densification process benefits from two synergistic mechanisms: carbon vacancy generation during in-situ reactions that enhances atomic diffusion, and a reactive sintering pathway facilitated by silicon-carbide interaction, which substantially lowers the densification temperature threshold. This low-temperature processing effectively suppresses grain coarsening while enabling in-situ formation of SiC that further constrain carbide phase growth through pinning. The resultant microstructure refinement (average grain size ∼200 nm), combined with full densification and SiC phase reinforcement, yields exceptional mechanical performance. Specifically, the (Ti,Zr,Hf,Nb,Ta)C-10 mol% Si composite sintered at 1700 °C demonstrates outstanding properties: flexural strength of 529 ± 17 MPa, fracture toughness of 5.2 ± 0.4 MPa m 1/2 , and Vickers hardness of 24.4 ± 0.7 GPa. These values either match or surpass those reported for most (Ti,Zr,Hf,Nb,Ta)C-based ceramic systems.

关键词： Vickers hardness

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Anisotropic ultrafast hot carrier dynamics of two-dimensional SnS single crystals

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Physical chemistry chemical physics : PCCP 2025年第23期27卷 2025 May 28页

作者： Zanxiong Peng Borong Cong Jiajun Cao Chunlian Li Xiaodong Shen Weizheng Liang State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials and School of Resources Environment and Materials Guangxi University Nanning 530004 China. wzliang@***. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Physical Science and Technology Guangxi University Nanning 530004 China.

In this paper, we investigated the temperature-dependent and anisotropic ultrafast hot carrier decay dynamics of two-dimensional SnS single crystals using femtosecond transient optical spectroscopy. The photo-excited hot carriers in SnS are relaxed a fast decay () and a slow decay (), which are contributed by the electron-phonon interactions coupling with high frequency and low frequency optical phonons of SnS, respectively. Both the and decay times show anisotropy. In the -plane, both and decays have a faster relaxion time in the -axis direction than in the -axis direction, which is due to the crystal anisotropy of SnS. The crystal anisotropy of SnS gives rise to more phonon vibrations in the -axis direction than in the -axis direction, which leads to stronger electron-phonon coupling along the -axis direction and manifests as a shorter decay time along the -axis direction. For the decay process, the femtosecond laser pump induces different dielectric responses in the -plane. In the -axis direction, the pump laser induces a reduction in the dielectric coefficient (Δ < 0), while it induces an increase in the dielectric coefficient (Δ > 0) in the -axis.

关键词： Optical pumping

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Mitigating the Kinetic Hysteresis of Co-Free Ni-Rich Cathodes via Gradient Penetration of Nonmagnetic Silicon

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Angewandte Chemie 2024年第48期136卷

作者： Dr. Yijun Song Prof. Yongpeng Cui Dr. Bo Wang Dr. Lina Ge Dr. Li Zhou Dr. Zhijian Qiu Zhipeng Xie Prof. Debin Kong Prof. Xiaofang Li Prof. Jianqiang Zhang Prof. Lei Zhu Prof. Pengyun Liu Prof. Xuejin Li Prof. Zifeng Yan Prof. Qingzhong Xue Prof. Yongfu Tang Prof. Wei Xing School of Materials Science and Engineering State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) 266580 Qingdao China College of New Energy and Materials State Key Laboratory of Heavy Oil Processing China University of Petroleum (Beijing) 102249 Beijing China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University 066004 Qinhuangdao China College of New Energy Research Center on Advanced Chemical Engineering and Energy Materials China University of Petroleum (East China) 266580 Qingdao China College of Science China University of Petroleum (East China) 266580 Qingdao China

Co-free Ni-rich layered oxides are considered a promising cathode material for next-generation Li-ion batteries due to their cost-effectiveness and high capacity. However, they still suffer from the practical challenges of low discharge capacity and poor rate capability due to the hysteresis of Li-ion diffusion kinetics. Herein, based on the regulation of the lattice magnetic frustration, the Li/Ni intermixing defects as the primary origin of kinetic hysteresis are radically addressed via the doping of the nonmagnetic Si element. Meanwhile, by adopting gradient penetration doping, a robust Si−O surface structure with reversible lattice oxygen evolution and low lattice strain is constructed on Co-free Ni-rich cathodes to suppress the formation of surface dense barrier layer. With the remarkably enhanced Li-ion diffusion kinetics in atomic and electrode particle scales, the as-obtained cathodes (LiNi x Mn 1−x Si 0.01 O 2 , 0.6≤x≤0.9) achieve superior performance in discharge capacity, rate capability, and durability. This work highlights the coupling effect of magnetic structure and interfacial chemicals on Li-ion transport properties, and the concept will inspire more researchers to conduct an intensive study.

关键词： Co-free Ni-rich kinetic hysteresis oxygen loss magnetic frustration gradient doping

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Shape memory performance and damage mechanism of three-dimensional knitted tubular composites improved with helical yarns

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Thin-Walled Structures 2025年 215卷

作者： Ziyan Niu Ying Huang Yang Liu Haipeng Ren Weilin Xu Wei Zhao State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China School of Fashion & Textiles The Hong Kong Polytechnic University Hong Kong China Department of Astronautical Science and Mechanics Harbin Institute of Technology Harbin 150001 China

Three-dimensional (3D) continuous fibers reinforced tubular shape memory polymer composites (SMPCs) have potential advantages of lightweight, high strength and excellent spatial folding efficiency, but they have limited shape-recovery performance after large deformation. In this work, 3D tubular knitted fabric reinforced SMPCs with single and double helical yarns were developed. The effects of the knitting density, compressive strain and helical yarns on shape memory properties of SMPCs were systematically investigated. The results show that SMPCs with smaller knitting density, compressive strain and helical pitch have larger shape recovery speed. At 40 % compressive strain, the shape recovery force of SMPC with double helical yarns improves 4.0 times than that of SMEP and 3.1 times than that of SMPC without helical yarns. The introduction of helical yarns in SMPC can obviously improve shape recovery performance. The viscoelastic finite element models for simulating the free shape recovery behaviors of SMPCs without and with helical yarns were established. The shape recovery mechanism and stress distribution of 3D tubular knitted SMPCs are analyzed. The compressive damage mechanism of 3D tubular knitted SMPC is revealed. The concept of residual compressive properties after multiple shape memory cycles is introduced to evaluate the mechanical durability of SMPCs. The 3D tubular knitted fabric reinforced SMPCs with helical yarns show good mechanical durability at the compressive strain from 40 % to 90 % and in 10 shape memory cycles. The tubular knitted fabric-reinforced SMPCs can obtain a volume saving of above 84 % after temporary shape-deforming, which contributes to the development of space-deployable structures.

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Structure modification and recovery of amorphous Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 magnetic ribbons after autoclave treatment:SAXS and thermodynamic analysis

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Journal of materials Science & technology 2019年第1期35卷 118-126页

作者： L.Y.Guo X.Wang K.C.Shen K.B.Kim S.Lan X.L.Wang W.M.Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Department of Nanotechnology and Advanced Materials Engineering Sejong University Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Department of Physics City University of Hong Kong

The structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic parameters of samples increase firstly, i.e. R0 < R1; and then decrease or recover to the as-quenched sample, i.e. R2 < R1 or R2 ≈ R0. These results indicate that the SROs in R1 samples increased by transforming from fcc to bcc structure during the autoclave treatment and that the autoclave treatment can decrease the large radius(r_M) MRO(medium range order),but increase the small rMMRO. The measured structural, thermal and magnetic parameters of R2 sample have a tendency to recover toward as-quenched R0 sample. The thermal and magnetic parameters of samples after solely annealing treatment at higher temperature have no obvious recover *** uneven actions of pressure and temperature in autoclave treatment may be helpful for us to search a new method to improve the magnetic properties of Fe-based glasses.

关键词： SAXS (small-angle X-ray scattering) Fe-based glass Thermodynamic Magnetic ribbon DSC (differential scanning calorimetry)

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The X80 Pipeline Steel produced by a Novel Ultra Fast Cooling Process 6

The X80 Pipeline Steel produced by a Novel Ultra Fast Coolin...

引用

2020 6th International Conference on materials, Mechanical Engineering and Automation technology, MMEAT 2020

作者： Zhou, Feng Dai, Jietao Gao, Jixiang Zhou, Qing Li, Liejun Foshan Polytechnic Foshan Guangdong528137 China Guangzhou University Guangzhou510640 China Guangdong Polytechnic Normal University Guangzhou510640 China Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510640 China

The relation between microstructure characteristics and mechanical properties of X80 pipeline steels produced by ultra fast cooling process was investigated using energy dispersive spectrometer, scanning and transmission electron microscopy. Results showed that ultra fast cooling kept hot rolled austenitic work hardened, induced a large number of carbonitride precipitation, limited the growth of cementite. Therefore ultra fast cooling was beneficial to increase the steel strength and improve the steel ductility and toughness. © Published under licence by IOP Publishing Ltd.

关键词： High resolution transmission electron microscopy

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Modeling of transportation in electroslag metallurgy process 26

Modeling of transportation in electroslag metallurgy process

引用

26th International Mining Congress and Exhibition of Turkey, IMCET 2019

作者： Shen, H.F. Shi, H. Key Laboratory for Advanced Materials Processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9786050112733

Electroslag remelting (ESR) is an effective method for the production of high-quality ingots. In ESR process, the movement of droplets and fluid flow play an important role in heat and mass transfer in slag. In this paper, the droplet formation and movement during ESR process is simulated by means of a magnetohydrodynamic (MHD) and the slag-metal multiphase flow is modeled with Re-Normalisation Group (RNG) k- turbulence model. The computational domain includes a layer of slag and a layer of liquid steel. The two-phase flow is tracked with the volume of fluid (VOF) method. Results show that a strong interaction among electromagnetic field, fluid flow and heat transfer. Since the metal has a higher electrical conductivity, the electric current travels through the liquid metal in priority and the current density around the droplet is higher than that in the periphery of the electrode. Hence, the maximum Joule heat and Lorentz force occur in the slag around the metal droplet. Under the electrode, a thin metal liquid film is formed first and then the droplet is formed. The droplet falling causes strong flow in the slag and melt pool. The flow in the slag is more vigorous throughout the process than that in the metal pool. The flow in the slag has two dominant flow vortexes. The colder metal in the liquid metal pool flows downward washing the solidification front in the process. Copyright © IMCET 2019 International Mining Congress and Exhibition of Turkey. All rights reserved.

关键词： Slags

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Corrigendum to “Hierarchical rigid porous composites towards impact resistance and fire safety” [Compos Part B: Eng Hierarchical Rigid Porous Compos Towards Impact Resist Fire Saf 270 (2024) 111139]

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Composites Part B: Engineering 2024年 273卷

作者： Yongqian Shi Ruizhe Huang Miao Liu Junqiang Han Peihui Xu Yuezhan Feng Libi Fu Fuqiang Yang Bin Yu College of Environment and Safety Engineering Fuzhou University 2 Xueyuan Road Fuzhou 350116 China Key Laboratory of Materials Processing and Mold Ministry of Education National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou University Zhengzhou 450002 China College of Civil Engineering Fuzhou University 2 Xueyuan Road Fuzhou 350116 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China

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A model for simulation of recrystallization microstructure in single-crystal superalloy

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Rare Metals 2018年第12期37卷 1027-1034页

作者： Run-Nan Wang Qing-Yan Xu Bai-Cheng Liu Key Laboratory for Advanced Materials Processing Technology (MOE) School of Materials Science and Engineering Tsinghua University

In the present investigation, a coupled crystal plasticity finite-element(CPFE) and cellular automaton(CA) model was developed to predict the microstructure of recrystallization in single-crystal(SX) Ni-based *** quasi-static compressive tests of [001] orientated SX DD6 superalloy were conducted on Gleeble3500 tester to calibrate the CPFE model based on crystal slip *** simulated stress-strain curve agrees well with the experimental results. Quantitative deformation amount was introduced in the deformed samples of simulation and experiment, and these samples were subsequently subjected to the standard solution heat treatment(SSHT).Results of CA simulation show that the recrystallization(RX) nucleation tends to occur at the third stage of SSHT process due to the high critical temperature of RX nucleation for the samples deformed at room temperature. The inhomogeneous RX grains gradually coarsen and compete to reach more stable status by reducing the system *** RX grain density decreases from 7.500 to1.875 mm,agreeing well with the value of 1.920 mmfrom electron backscattered diffraction(EBSD) detection of the experimental sample.

关键词： Recrystallization Single crystal Crystal plasticity Cellular automaton Microstructure

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