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Microstructure and texture evolution of Cu–Cr–Co–Ti alloys during the two-stage cryorolling

Rare Metals 2024年第9期43卷 4535-4547页

作者： Jia-Jun Zhang Long-Jian Li Zhi-Feng Liu Zong-Ning Chen En-Yu Guo Hui-Jun Kang Ren-Geng Li Tong-Min Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and EngineeringDalian University of Technology center of hyper-gravity experimental and interdisciplinary research Zhejiang University Ningbo Institute of Dalian University of Technology！Ningbo315000 China Key Laboratory for Light-Weight Materials Nanjing Tech University

This study entailed an investigation of the mechanical properties, microstructural and texture orientation evolutions of CuDCrDCoDTi alloys prepared via twostage cryorolling and intermediate aging treatment. To this end, X-ray diffraction and electron backscatter diffraction were employed. The results indicate that the two-stage cryorolling and intermediate aging treatments led to the development of profuse twin bundles and significantly enhanced the mechanical properties. The initial cryorolling led to coplanar slip and developed a strong Y({111} ) orientation, accelerating the formation of Goss({011} ) orientation and a Brass-type *** intermediate aging treatment relieved the restriction on dislocation slip and reoriented the grains toward the Copper({112} ) and Z({111} ) *** Z orientation, with a relatively high volume fraction,dominated the macrotexture. Secondary cryorolling intensified twinning and shear banding, transforming the Copper-type shear bands into Brass-type shear bands with rhomboidal prism morphology. The areas inside the Brasstype shear bands exhibited a Y orientation, and the areas outside the shear bands exhibited a stable Brass-type texture. The evident decrease in the weighted Schmid factors demonstrated that the two-stage cryorolling and intermediate aging treatment can modify the texture evolution and aid the design of high-performance Cu alloys.

关键词： Copper alloys Electron backscatter diffraction Macrotexture evolution Schmid factor Two-stage cryorolling

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Feasibility analysis of hypergravity experiment of density-driven convection of dissolved CO

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Journal of Earth Science 2024年

作者： Ruiqi Chen Wenjie Xu Yingtao Hu Yunmin Chen Jinlong Li Duanyang Zhuang center for hypergravity experimental and interdisciplinary research Zhejiang University MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University School of Engineering Hangzhou City University

Dissolution trapping is one of the most promising mechanisms for safe geological carbon storage. Density-driven convection substantially accelerates the conversion of free-phase CO2to the dissolved state， enhancing the sequestration safety. Since this process occurs on time scales of hundreds to thousands of years， reproducing it through conventional laboratory physical model tests is challenging. The hypergravity experiment reduces the model size and shortens the experimental time， enabling the modeling of gravity-driven flow processes at the field scale. However， it is uncertain whether the preferential flow effect caused by fractures can be reproduced in a hypergravity experiment. In this study， a three-dimensional discrete fracture-matrix model （3D-DFM） was used to evaluate the feasibility of hypergravity experiment of the transport of dissolved CO2in fractured *** hypergravity tests were performed to examine the feasibility of modeling density-driven convection in homogeneous and heterogeneous media at different centrifuge accelerations. The hypergravity experiment can be used to study density-driven convection of dissolved CO2at the field scale in homogeneous system. The numerical results show that the hypergravity experiment enables a faster breakthrough of plume and overestimates CO2migration in the matrix surrounding the fractures.

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hyper-gravity experiment of solute transport in fractured rock and evaluation method for long-term barrier performance

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Rock Mechanics Bulletin 2023年第3期2卷 1-14页

作者： Wenjie Xu Yingtao Hu Yunmin Chen Liangtong Zhan Ruiqi Chen Jinlong Li Duanyang Zhuang Qingdong Li Ke Li center for hyper-gravity experimental and interdisciplinary research Zhejiang UniversityHangzhou310058China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou310058China Department of Civil Engineering Hangzhou City UniversityHangzhou310015China Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou310015China Advanced Materials Additive Manufacturing Innovation research center Hangzhou City University310015China

hyper-gravity experiment enable the acceleration of the long-term transport of contaminants through fractured geological ***,the hyper-gravity effect of the solute transport in fractures are not well *** this study,the sealed control apparatus and the 3D printed fracture models were used to carry out 1 g and N g hyper-gravity *** results show that the breakthrough curves for the 1 g and N g experiments were almost the *** differences in the flow velocity and the fitted hydrodynamic dispersion coefficient were 0.97–3.12%and 9.09–20.4%,indicating that the internal fractures of the 3D printed fracture models remained stable under hyper-gravity,and the differences in the flow and solute transport characteristics were acceptable.A method for evaluating the long-term barrier performance of low-permeability fractured rocks was proposed based on the hyper-gravity *** solute transport processes in the 1 g prototype,1 g scaled model,and N g scaled model were simulated by the OpenGeoSys(OGS)*** results show that the N g scaled model can reproduce the flow and solute transport processes in the 1 g prototype without considering the micro-scale heterogeneity if the Reynolds number(Re)critical Reynolds number(Recr)and the Peclet number(Pe)the critical Peclet number(Pecr).This insight is valuable for carrying out hyper-gravity experiments to evaluate the long-term barrier performance of low-permeability fractured porous rock.

关键词： hyper-gravity effect Fractured rock 3D printed fracture Solute transport Long-term

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烧结铜丝和沟槽热管热性能特性的实验研究

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Journal of Central South University 2021年第11期28卷 3507-3520页

作者： Saif Ullah KHALID Hafiz Muhammad ALI Muhammad Ali NASIR Riffat Asim PASHA ZAFAR SAID L.Syam SUNDAR Ahmed Kadhim HUSSEIN Mechanical Engineering Department University of Engineering and TechnologyTaxila 47050Pakistan Mechanical Engineering Department King Fahd University of Petroleum&Minerals(KFUPM)Dhahran 31261Saudi Arabia interdisciplinary research center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Sustainable and Renewable Energy Engineering Department College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Centre for Mechanical Technology and Automation(TEMA-UA) Department of Mechanical EngineeringUniversity of AveiroAveiro 3810-131Portugal Mechanical Engineering Department College of EngineeringUniversity of BabylonBabylon CityHillaIraq

热管是最常用的热管理解决方案。为达到最佳效果,在特定的情况下选择合适的热管类型是非常必要的。本研究的目的是比较烧结铜丝热管和沟槽热管两种常用热管的热性能特点。采用重力辅助定位实验对充蒸馏水热管进行了测试,得到毛细管压力... 详细信息

热管是最常用的热管理解决方案。为达到最佳效果,在特定的情况下选择合适的热管类型是非常必要的。本研究的目的是比较烧结铜丝热管和沟槽热管两种常用热管的热性能特点。采用重力辅助定位实验对充蒸馏水热管进行了测试,得到毛细管压力、操作温度、热阻和传热系数等参数结果。烧结热管的毛细管压力比所有尺寸沟槽热管的都高。在相同的热负荷下,与烧结热管相比,沟槽热管的工作温度更低。在8 W热负荷下,与烧结热管相比,沟槽热管冷凝器表面温度降低8.24%,蒸发器表面温度降低4.41%,饱和温度降低7.79%。烧结热管的热阻比沟槽热管低得多,在8 W热负荷下,最大相对差值为63.8%。在8 W热负荷下,烧结热管的传热系数是开槽热管的2倍。烧结热管的热阻和传热系数随热负荷的变化几乎呈线性变化,而沟槽热管的热阻和传热系数却出现意外的拐点。与烧结热管相比,沟槽热管更早达到平衡。当热负荷从4增加至20 W时,沟槽热管达到平衡的时间从7 min缩短至4 min,烧结热管的平衡时间从10 min缩短至7 min。

关键词：热管热阻传热系数热性能毛细管压力

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experimental and Numerical Investigation of a Rayleigh-Bénard Convection Affected by Coriolis Force

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Journal of Flow Control, Measurement & Visualization 2014年第4期2卷 165-172页

作者： Claudia Zimmermann Rodion Groll center of Applied Space Technology and Microgravity University of Bremen Bremen Germany

In this paper the influence of an impressed Coriolis force field on the configuration of a turbulent Rayleigh-Bénard convection problem is investigated in an experimental and numerical study. The main purpose of both studies lie on the analysis of a possible stabilising effect of a Coriolis acceleration on the turbulent unsteady structures inside the fluid. The relative Coriolis acceleration which is caused in the atmosphere by the earth rotation is realised in the experimental study by a uniform-rotational movement of the setup in a large-scale centrifuge under hyper-gravity. The same conditions as in the atmosphere in the beginning of a twister or hurricane should be realised in the experiment. The investigated Rayleigh numbers lie between 2.33 × 106 ≤ Ra ≤ 4.32 × 107.

关键词： Rayleigh-Bénard Convection Compressible Flow Coriolis Force PIV Large-Eddy Simulation

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