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采用深冷异步轧制提高高熵合金颗粒增强铝基复合材料的力学性能

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Transactions of Nonferrous Metals Society of China 2023年第7期33卷 1988-2000页

作者：罗开广吴雨泽熊汉青张昀 charlie kong 喻海良中南大学极端服役性能精准制造全国重点实验室长沙410083 中南大学机电工程学院长沙410083 Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia 中南大学轻合金研究院长沙410083

为了获得更高性能的铝基复合材料(AMCs),采用室温异步轧制(AR,298 K)和深冷异步轧制(ACR,77 K)制备高熵合金颗粒增强铝基复合材料带材。通过拉伸实验、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对铝基复合材料的力学性能和微观结构进... 详细信息

为了获得更高性能的铝基复合材料(AMCs),采用室温异步轧制(AR,298 K)和深冷异步轧制(ACR,77 K)制备高熵合金颗粒增强铝基复合材料带材。通过拉伸实验、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对铝基复合材料的力学性能和微观结构进行分析。结果表明,深冷异步轧制比室温异步轧制更能提高复合材料的力学性能。深冷异步轧制含3%(质量分数)高熵合金颗粒的铝基复合材料的抗拉强度达到253 MPa,比室温异步轧制复合材料提高13.5%。与室温异步轧制相比,深冷异步轧制的复合材料具有更少的微孔洞、更细小的晶粒尺寸和更高的位错密度。深冷异步轧制复合材料微缺陷的减少是因为铝基高熵合金颗粒复合材料在深冷环境中具有合适的体积收缩效应。

关键词：铝基复合材料 Al0.5CoCrFeNi高熵合金颗粒深冷异步轧制晶粒尺寸微观缺陷

Mechanical properties and microstructure evolution of an Al-Cu-Li alloy subjected to rolling and aging

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Journal of Central South University 2021年第12期28卷 3800-3817页

作者： WANG Lin BHATTA Laxman XIONG Han-qing LI Chang CUI Xiao-hui kong charlie YU Hai-liang State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China Electron Microscope Unit University of New SouthWalesSydneyNSW 2052Australia

The mechanical properties and microstructure of Al-Cu-Li alloy sheets subjected to cryorolling(-100 ° C,-190 ℃) or hot rolling(400 ℃) and subsequent aging at 160 ℃ for different times were investigated. The dynamic precipitation and dislocation characterizations were examined via transmission electron microscopy and X-ray diffraction. The grain morphologies and the fracture-surface morphologies were studied via optical microscopy and scanning electron microscopy. Samples subjected to cryorolling followed by aging exhibited relatively high dislocation densities and a large number of precipitates compared with hot-rolled samples. The samples cryorolled at-190 ℃ and then aged for 15 h presented the highest ultimate tensile strength(586 MPa), while the alloy processed via hot rolling followed by 10 h aging exhibited the highest uniform elongation rate(11.5%). The size of precipitates increased with the aging time, which has significant effects on the interaction mechanism between dislocations and precipitates. Bowing is the main interaction method between the deformation-induced dislocations and coarsened precipitates during tensile tests, leading to the decline of the mechanical properties of the alloy during overaging. These interesting findings can provide significant insights into the development of materials possessing both excellent strength and high ductility.

关键词： Al-Cu-Li alloy cryorolling artificial aging dynamic precipitation dislocation density mechanical property

Microstructure evolution and mechanical properties of Al−3.6Cu−1Li alloy via cryorolling and aging

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Transactions of Nonferrous Metals Society of China 2020年第11期30卷 2904-2914页

作者： Chang LI Han-qing XIONG Laxman BHATTA Lin WANG Zhao-yang ZHANG Hui WANG charlie kong Hai-liang YU State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Research Center for Advanced Science and Technology The University of TokyoMeguroTokyo 1530041Japan Electron Microscope Unit University of New South WalesSydneyNSW 2052Australia Light Alloys Research Institute Central South UniversityChangsha 410083China

An Al−3.6Cu−1Li alloy was subjected to room temperature rolling and cryorolling to investigate their effects on microstructure evolution and mechanical *** microstructure and aging characteristics of the room temperature-rolled and the cryorolled alloys with 70%and 90%of thickness reductions were studied by microstructure analysis and mechanical *** samples subjected to cryorolling with 90%of thickness reduction have high strength and good *** is mainly due to the inhibition of dynamic recovery and the accumulation of high-density dislocations in cryorolled *** addition,the artificial aging reveals that the temperature at which peak hardness is attained is inversely proportional to the deformation amount and directly proportional to the rolling ***,bright field images of cryorolled samples after aging indicate the existence of T1(Al2CuLi)*** suggests that the high stored strain energy enhances the aging kinetics of the alloy,which further promotes the nucleation of T1 phases.

关键词： Al−Cu−Li alloy cryorolling aging precipitation strengthening mechanical property

Preparation of high-mechanical-property medium-entropy CrCoNi alloy by asymmetric cryorolling

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Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1559-1574页

作者： Yu-ze WU Zhao-yang ZHANG Juan LIU charlie kong Yu WANG Puneet TANDON Alexander PESIN Hai-liang YU State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia PDPM Indian Institute of Information Technology Design and ManufacturingJabalpur 482005India Laboratory of Mechanics of Gradient Nanomaterials Nosov Magnitogorsk State Technical UniversityMagnitogorsk 455000Russia

In order to obtain good strength−plasticity synergy for a medium entropy alloy(MEA)CrCoNi,cold rolling,asymmetric rolling,cryorolling and asymmetric-cryorolling with subsequent annealing at different temperatures were *** results showed that the asymmetric-cryorolled alloy achieved a high strength of over 1.6 *** annealing at 1073 K,it retained a high strength of~1 GPa while the elongation reached nearly 60%.After annealing,the heterogeneous characteristics were formed in asymmetric-cryorolled samples,which were found to be more distinct than those of the samples subjected to asymmetric *** resulted in the generation of high strength and ductility.

关键词： medium entropy alloy heterogeneous structure annealing mechanical properties asymmetric cryorolling

深冷轧制与时效处理提升2195铝锂合金腐蚀性能机理(英文)

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Transactions of Nonferrous Metals Society of China 2024年

作者：肖岳王文帅 Waqas Farid 张立华 charlie kong 喻海良中南大学极端服役性能精准制造全国重点实验室中南大学轻合金研究所 Mark Wainwright Analytical Centre， University of New South Wales

通过透射电子显微镜、扫描电子显微镜、光学显微镜、晶间腐蚀实验和电化学实验等研究了深冷轧制、室温轧制及其后续人工时效对2195铝锂合金腐蚀性能的影响。在时效处理的不同阶段，深冷轧制和室温轧制2195铝锂合金均呈现“点蚀-晶间腐蚀... 详细信息

通过透射电子显微镜、扫描电子显微镜、光学显微镜、晶间腐蚀实验和电化学实验等研究了深冷轧制、室温轧制及其后续人工时效对2195铝锂合金腐蚀性能的影响。在时效处理的不同阶段，深冷轧制和室温轧制2195铝锂合金均呈现“点蚀-晶间腐蚀-点蚀”的腐蚀模式，二者的腐蚀速率均呈现先增大后逐渐稳定的趋势。T1相的尺寸与密度对合金的腐蚀性能产生了重要影响，在峰时效与过时效阶段，更细小的T1相使得深冷轧制样品的耐腐蚀性能更优。

关键词： 2195铝锂合金深冷轧制时效处理腐蚀性能

深冷轧制在提高Al-Mg-Mn-Sc合金板材腐蚀性能中的作用(英文)

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Transactions of Nonferrous Metals Society of China 2024年

作者：顾昊贾帅广李智德高海涛王正宇 charlie kong 喻海良中南大学极端服役性能精密制造国家重点实验室中南大学机电工程学院中南大学轻合金研究院岛津(中国)有限公司 Electron Microscope Unit， University of New South Wales

通过调控轧制温度可以实现铝合金服役性能的提高。深冷轧制工艺提高了Al-Mg-Mn-Sc合金板材的腐蚀性能。相比室温轧制样品，深冷轧制50%的样品表现出比室温轧制样品更好的耐蚀性。敏化处理后，深冷轧制样品的最大晶间腐蚀深度为35.2 μm... 详细信息

通过调控轧制温度可以实现铝合金服役性能的提高。深冷轧制工艺提高了Al-Mg-Mn-Sc合金板材的腐蚀性能。相比室温轧制样品，深冷轧制50%的样品表现出比室温轧制样品更好的耐蚀性。敏化处理后，深冷轧制样品的最大晶间腐蚀深度为35.2 μm，而室温轧制样品的最大晶间腐蚀深度为53.9 μm。同样，两个样品的质量损失分别为6.89和73.11mg/cm2。此外，深冷样品的阻抗模量是室温轧制样品的2倍以上。深冷轧制样品中更厚的钝化膜，更加细小分散的Al6（Mn， Fe）相使其具有更好的耐点蚀性能。深冷轧制样品中的亚晶粒、剪切带、分散的Al3（Sc， Zr）相、更少的大角度晶界和更高密度的位错都阻碍了β (Al3Mg2)相在晶界的连续析出，并在晶内形成β相。这些微观特征降低了β相与铝基体之间的电耦合效应，显著减少了晶间腐蚀的发生。本研究填补了深冷轧制和室温轧制对Al-Mg-Mn-Sc合金腐蚀性能影响对比研究的空白。为提高该合金的耐腐蚀性能奠定了理论基础。

关键词： Al-Mg-Mn-Sc合金深冷轧制腐蚀性能微观组织晶粒尺寸第二相

Transition-metal doped edge sites in vertically aligned MoS2 catalysts for enhanced hydrogen evolution

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Nano Research 2015年第2期8卷 566-575页

作者： Haotian Wang charlie Tsai Desheng kong Karen Chan Frank Abild-Pedersen Jens K. Norskov Yi Cui Department of Applied Physics Stanford University Stanford CA 93205 USA Department of Chemical Engineering Stanford University Stanford CA 94305 USA SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA Stanford Institute for Materials and Energy Sciences SLAC NationalAccelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA .

Highly active and low-cost catalysts for electrochemical reactions such as the hydrogen evolution reaction （HER） are crucial for the development of efficient energy conversion and storage technologies. Theoretical simulations have been instrumental in revealing the correlations between the electronic structure of materials and their catalytic activity, and guide the prediction and development of improved catalysts. However, difficulties in accurately engineering the desired atomic sites lead to challenges in making direct comparisons between experi- mental and theoretical results. In MoS2, the Mo-edge has been demonstrated to be active for HER whereas the S-edge is inert. Using a computational descriptor- based approach, we predict that by incorporating transition metal atoms （Fe, Co, Ni, or Cu） the S-edge site should also become HER active. Vertically standing, edge-terminated MoS2 nanofilms provide a well-defined model system for verifying these predictions. The transition metal doped MoS2 nanofilms show an increase in exchange current densities by at least two-fold, in agreement with the theoretical calculations. This work opens up further opportunities for improving electrochemical catalysts by incorporating promoters into particular atomic sites, and for using well-defined systems in order to understand the origin of the promotion effects.

关键词： molybdenum disulfide chemical vapor deposition doping density functional theory

Plausible cloth animation using dynamic bending model

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Progress in Natural Science:Materials International 2008年第7期18卷 879-885页

作者： charlie C.L. Wang Department of Mechanical and Automation Engineering The Chinese University of Hong kong Hong kong China

Simulating the mechanical behavior of a cloth is a very challenging and important problem in computer animation. The models of bending in most existing cloth simulation approaches are taking the assumption that the cloth is little deformed from a plate shape. Therefore, based on the thin-plate theory, these bending models do not consider the condition that the current shape of the cloth under large deformations cannot be regarded as the approximation to that before deformation, which leads to an unreal static bending. [This paper introduces a dynamic bending model which is appropriate to describe large out-plane deformations such as cloth buckling and bending, and develops a compact implementation of the new model on spring-mass systems. Experimental results show that wrinkles and folds generated using this technique in cloth simulation, can appear and vanish in a more natural way than other approaches.]

关键词： Cloth animation Physically based animation Bending

Towards international:China-aided stadiums in the developing world

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Frontiers of Architectural Research 2019年第4期8卷 604-619页

作者： Wei Chang charlie QLXue School of Civil Engineering Tangshan UniversityTansshan 063000China Department of Architecture and Civil Engineering City University of Hong KongHong KongChino

Foreign aid is a form of international relationship between *** projects are a major form of foreign *** the past 60 years,China has constructed over 1400 buildings in the developing world,and many of them are *** study explores how China exported its overseas-aided stadiums in the developing world and considers the importance of these buildings from an architectural *** an examination of firsthand materials,this study explains the historic vicissitude of China-aided stadium architecture,analyzes the architectural features of these buildings,and presents case studies of representative examples from each historic *** investigation of these buildings from three periods in the 20th and 21st centuries fills a gap in the study of Chinese architecture and modern architectural history.

关键词： China’s aid Stadiums Developing world Architectural design