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Impact of atomization methods on aluminum alloy powder characteristics and 3D printing performance in laser directed energy deposition process

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Transactions of Nonferrous Metals Society of China 2025年第4期35卷 1057-1074页

作者： Gang RUAN Yu-dong LIANG Gan LI Ying JIN Xing-gang LI Department of Mechanical and Energy Engineering Southern University of Science and Technology(SUSTech)Shenzhen 518055China Department of Materials Science and Engineering Southern University of Science and Technology(SUSTech)Shenzhen 518055China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Zhejiang Yatong Advanced Materials Co. Ltd.Hangzhou 310030China

A comparative study on the performance of gas atomized(GA)and rotating-disk atomized(RDA)aluminum alloy powders produced on industrial scale for laser directed energy deposition(L-DED)process was carried *** powder characteristics,the printing process window,and the quality,microstructure,and mechanical properties of printed parts were taken into account for comparison and *** results demonstrate that the RDA powder is superior to the GA powder in terms of sphericity,surface quality,internal defects,flowability,and apparent density,together with a larger printing process window during the L-DED parts ***,the resultant parts from the RDA powder have higher dimensional accuracy,lower internal defects,more uniform and finer microstructure,and more favorable mechanical properties than those from the GA powder.

关键词： metal additive manufacturing rotating disk atomization gas atomization AlSi10Mg powder powder feedstocks

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Emergence of local scaling relations in adsorption energies on high-entropy alloys

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npj Computational materials 2022年第1期8卷 815-821页

作者： Wissam A.Saidi National Energy Technology Laboratory United States Department of EnergyPittsburghPA15236USA Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA15261USA

Alloying has been proposed to circumvent scaling relations between the adsorption energies thus allowing for the complete optimization of multistep *** the fidelity of scaling rules on high-entropy alloy(HEA)surfaces is assessed focusing on hydrogen-containing molecules,^(*)AH_(x) for A=C and N(x=0,1,2,3),A=S(x=0,1,2)and A=O(x=0,1).Using an adsorbate-and site-specific deep learning model to rapidly compute the adsorption energies on CoMoFeNiCu HEA surfaces,the energies of ^(*)AH_(x) and ^(*)A are shown to be linearly correlated if ^(*)A and ^(*)AH_(x) have identical adsorption site ***,a local linear dependence emerges between the configuration-averaged adsorption energies irrespective of the site *** these correlations represent a weaker form of the scaling relationships,they are sufficient to prohibit the optimization of multistep *** underpinning of this behavior is twofold(1)the nearsightedness principle and(2)the narrow distribution of the adsorption energies around the mean-field *** the nearsightedness is general for all electronic systems,the second criterion applies in HEAs with relatively strong reactive *** present findings strongly suggest that alloys may not generally enable the breaking of scaling relationships.

关键词： alloys alloy adsorption

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Diffusioosmotic Reversal of Colloidal Focusing Direction in a Microfluidic T-Junction

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Physical Review Letters 2025年第9期134卷 098201-098201页

作者： Haoyu Liu Amir A. Pahlavan Department of Mechanical Engineering and Materials Science Yale University New Haven Connecticut 06511 USA

Solute gradients next to an interface drive a diffusioosmotic flow, the origin of which lies in the intermolecular interactions between the solute and the interface. These flows on the surface of colloids introduce an effective slip velocity, driving their diffusiophoretic migration. In confined environments, the interplay between diffusiophoresis and diffusioosmosis governs the motion of colloids. Previous studies have indeed demonstrated the quantitative modulation of phoretic migration by the osmotic flows. Here, we show that diffusioosmotic flows can lead to qualitatively distinct outcomes, reversing the direction of colloidal focusing expected from diffusiophoresis alone. Using microfluidic experiments in a T-junction, numerical simulations, and theoretical modeling, we explain our observations to be due to an interplay between diffusiophoretic migration of colloids toward the walls and their entrainment in a diffusioosmotic vortex. We show this focusing to be persistent for a range of salt types, salt gradients, and flow rates, and establish a criterion for its emergence. Our work sheds light on how boundaries modulate the solute-mediated transport of colloids in confined environments and how the colloidal trajectories can be utilized to infer the surface properties.

关键词： Focusing

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Reduced erosion and its erosion reducing mechanism of gun propellants by octaphenylsilsesquioxane

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材料科学技术（英文版） 2025年第4期207卷 86-94页

作者： Taixin Liang Jiaxin Lu Fei Xiao Hua Guo Chunzhi Li Mukun He Baosheng Liu Zeinhom M.El-Bahy Nawaa Ali H.Alshammari Xin Liao Salah M.El-Bahy Zhongliang Xiao Zhanhu Guo School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Luzhou North Chemical Industries Co. LTDLuzhou 646000China School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Luzhou North Chemical Industries Co. LTDLuzhou 646000China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry Faculty of ScienceNorthern Border UniversityArar 73222Saudi Arabia School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Mechanical and Civil Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon TyneNE1 8STUK

Low erosion high-energy propellant is one of the research directions to extend the weapon's life and improve the weapon's *** this study,energetic propellants containing different corrosion in-hibitors were designed and *** bomb tests and semi-confined bomb experiments were used to investigate the burning and erosion properties of the *** mechanism of erosion-reducing of titanium dioxide(titania,TiO2),talc,and octaphenylsilsesquioxane(OPS)on the propellant was com-paratively *** results show that OPS has the lowest burning rate and the longest burning time,and a minimized loss of fire force,with the best effect of explosion heat *** erosion reduction efficiency of OPS is twice that of TiO2 and *** mechanism analysis shows that the decomposition and heat absorption of OPS can effectively reduce the thermal erosion effect and carbon erosion,and the gas produced can reduce the loss of chamber pressure and form a uniformly distributed nano-SiO2 protective *** solid-state high-efficiency organosilicon erosion inhibitor is an important guide for designing high-energy low-erosion gun propellants.

关键词： Octaphenylsilsesquioxane Propellant Erosion inhibitors High efficiency

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Optimization of tribological performance of natural fibers/epoxy composites using ANOVA & TOPSIS approach

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materials Today: Proceedings 2022年 56卷 2549-2555页

作者： Singh, Kartar Rinawa, Moti Lal Ahamad, Naseem Chaudhary, Vijay Das, Partha Pratim Gupta, Sumit Gupta, Pallav Government Engineering College Jhalawar Rajasthan India Department of Mechanical Engineering Government Engineering College Jhalawar Rajasthan India Department of Mechanical Engineering College of Engineering & Technology IILM Academy of Higher Learning India Department of Mechanical Engineering A.S.E.T. Amity University Uttar Pradesh Noida India Department of Materials Science and Metallurgical Engineering Indian Institute of Technology Hyderabad Kandi Sangareddy 502285 Telangana India

Natural fiber reinforced polymer composites are being used globally in every field of engineering and technology to develop structural and non-structural components. These composites are being extensively used in automobile sector, aerospace sector, shipping industries and medical equipment's. Such type of materials has gained attention due to their massive properties such as partial bio-degradability, non-toxic and high specific strength. The present work represents the optimization of tribological performance (frictional force, coefficient of friction and specific wear rate) of polymer composites using ANOVA & TOPSIS methods. In this work, polymeric composites were fabricated by jute, hemp, flax reinforced fibers with epoxy polymer using hand lay-up technique. ANOVA and TOPSIS have been used as an efficient tool for optimizing the wear data. ANOVA tool represents that friction force, coefficient of friction and specific wear rate of the samples have discrete effect with the composition of samples as well as applied load. ANOVA technique only mentions the effect of variable but do not define which sample has maximum effect of variables. TOPSIS technique assigns the rank of the samples according to performance. © 2021

关键词： Friction

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Many-body potential for simulating the self-assembly of polymer-grafted nanoparticles in a polymer matrix

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npj Computational materials 2023年第1期9卷 71-84页

作者： Yilong Zhou Sigbjørn Løland Bore Andrea R.Tao Francesco Paesani Gaurav Arya Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Materials Science Division Lawrence Livermore National LaboratoryLivermoreCA 94550USA Department of Chemistry and Biochemistry University of CaliforniaSan DiegoLa JollaCA 92093USA Department of Chemical and NanoEngineering University of CaliforniaSan DiegoLa JollaCA 92023USA

Many-body interactions between polymer-grafted nanoparticles(NPs)play a key role in promoting their assembly into low-dimensional structures within polymer melts,even when the particles are spherical and isotropically ***,capturing such interactions in simulations of NP assembly is very challenging because explicit modeling of the polymer grafts and melt chains is highly computationally expensive,even using coarse-grained ***,we develop a many-body potential for describing the effective interactions between spherical polymer-grafted NPs in a polymer matrix through a machine-learning *** approach involves using permutationally invariant polynomials to fit two-and three-body interactions derived from the potential of mean force *** potential developed here reduces the computational cost by several orders of magnitude,thereby,allowing us to explore assembly behavior over large length and time *** show that the potential not only reproduces previously known assembled phases such as 1D strings and 2D hexagonal sheets,which generally cannot be achieved using isotropic two-body potentials,but can also help discover interesting phases such as networks,clusters,and *** demonstrate how each of these assembly morphologies intrinsically arises from a competition between two-and three-body *** approach for deriving many-body effective potentials can be readily extended to other colloidal systems,enabling researchers to make accurate predictions of their behavior and dissect the role of individual interaction energy terms of the overall potential in the observed behavior.

关键词： grafted polymer potential

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Cathodic electrodeposition of polymer networks as ultrathin films on 3-D micro-architected electrodes

RSC Applied Polymers

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RSC Applied Polymers 2024年第6期2卷 1139-1146页

作者： Zheng, Zhaoyi Resing, Anton B. Wang, Wenlu Werner, Jörg G. Division of Materials Science and Engineering Boston University Boston 02215 MA United States Department of Mechanical Engineering Boston University Boston 02215 MA United States Department of Chemistry Boston University Boston 02215 MA United States

Advances in precision coatings are critical in enhancing the functionality of porous materials and the performance of three-dimensionally (3-D) micro-architected devices in applications ranging from molecular sorption and separation to energy storage and conversion. To address this need, we report the cathodic electrodeposition of polymer networks (EPoN) that utilizes the coupling between pre-synthesized polymers with electrochemically active end groups and a complementary crosslinker to form a step-growth polymer network. The electrochemically mediated crosslinking reaction confines the network formation to the electrode surface in a passivating and self-limiting film growth, preventing uncontrolled precipitation and deposition away from the surface. The cathodic electrodeposition is compatible with a variety of conductive substrates, which is demonstrated for 3-D carbons and metals with micron-scale pores of high aspect ratio. The entire pore surface of the 3-D electrodes is enveloped by a conformal polymer thin film that is free of detectable defects and highly electronically insulating for its potential use as an ultrathin artificial electrolyte interphase or solid polymer electrolyte. Since our EPoN concept decouples the polymer functionality from its electrodeposition chemistry, we envision it to be a widely applicable method to coat various conductive non-planar and micro-architected 3-D substrates with polymers of broad functionalities. © 2024 RSC.

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Experimental investigation of the flow-induced motion of a square-section cylinder

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Journal of Hydrodynamics 2021年第2期33卷 301-310页

作者： Alireza Modir Amirhossein Mohammadkhani Hamed Ahani Department of Mechanical and Materials Engineering Florida International UniversityMiamiUSA School of Mechanical Engineering Iran University of Science and TechnologyTehranIran Department of Mechanical Engineering University of North Carolina at CharlotteCharlotteUSA

The flow-induced motion(FIM)of an elastically mounted square-section cylinder is experimentally investigated over a wide range of Reynolds numbers(1.5×10^(4)<Re<7.0×10^(4)).A 14 mlong towing tank water... 详细信息

The flow-induced motion(FIM)of an elastically mounted square-section cylinder is experimentally investigated over a wide range of Reynolds numbers(1.5×10^(4)

关键词： Flow-induced motion(FIM) vortex-induced vibration(VIV) square-section cylinder angle of attack towing-tanks water channel

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不锈钢-铜复合箔材微拉深成形性能的模拟和实验研究（英文）

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Journal of Central South University 2025年第04期32卷 1237-1251页

作者：齐艳阳马晓光姜正义马丽楠王志华周存龙 HASAN Mahadi DOBRZA?SKI Leszek A. 赵敬伟 College of Mechanical Engineering Taiyuan University of Technology Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment(Ministry of Education) School of Mechanical Materials Biomedical and Mechatronic Engineering University of Wollongong School of Mechanical Engineering Taiyuan University of Science and Technology Department of Industrial and Production Engineering American International University Bangladesh Medical and Dental Engineering Center for Research Design and Production ASKLEPIOS

在本研究中，将厚度为50μm的双层不锈钢-铜复合箔材分别在800、900和1000℃下退火5 min，以获得不同的微观组织结构。研究退火温度对不锈钢-铜复合箔材成形性能和微拉深件表面质量的影响，并分析了其成形机制，开发了基础模型、Vorono... 详细信息

在本研究中，将厚度为50μm的双层不锈钢-铜复合箔材分别在800、900和1000℃下退火5 min，以获得不同的微观组织结构。研究退火温度对不锈钢-铜复合箔材成形性能和微拉深件表面质量的影响，并分析了其成形机制，开发了基础模型、Voronoi模型和表面形貌模型用于分析不锈钢-铜复合箔材微拉深过程中的成形性能。结果表明，900℃退火的不锈钢-铜复合箔材的微观组织均匀且细化，因而表现出最佳的塑性。在微拉深过程中，拉深力随退火温度的升高而降低。900℃退火试样成形的微拉深件起皱较少，壁厚分布较均匀，表面质量较高。与基础模型和Voronoi模型相比，考虑材料不均匀性和表面形貌的表面形貌模型与实验结果最接近。

关键词：微拉深退火温度不锈钢-铜复合箔材成形性能起皱有限元方法

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In vitro and in vivo study on fine-grained Mg-Zn-RE-Zr alloy as a biodegradeable orthopedic implant produced by friction stir processing

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Bioactive materials 2023年第10期28卷 448-466页

作者： Vasanth C.Shunmugasamy Marwa AbdelGawad Muhammad Umar Sohail Talal Ibrahim Talha Khan Thomas Daniel Seers Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDohaQatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843USA Proteomics Core Weill Cornell MedicineEducation CityDohaQatar Department of Surgery Division of Orthopedic SurgerySidra MedicineDohaQatar Clinical Orthopedic Surgery Weill Cornell MedicineEducation CityDohaQatar Petroleum Engineering Program Texas A&M University at QatarEducation CityDohaQatar Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843USA

Magnesium alloys containing biocompatible components show tremendous promise for applications as temporary biomedical devices. However, to ensure their safe use as biodegradeable implants, it is essential to control their corrosion rates. In concentrated Mg alloys, a microgalvanic coupling between the α-Mg matrix and secondary precipitates exists which results in increased corrosion rate. To address this challenge, we engineered the microstructure of a biodegradable Mg-Zn-RE-Zr alloy by friction stir processing (FSP), improving its corrosion resistance and mechanical properties simultaneously. The FS processed alloy with refined grains and broken and uniformly distributed secondary precipitates showed a relatively uniform corrosion morphology accompanied with the formation of a stable passive layer on the alloy surface. In vivo corrosion evaluation of the processed alloy in a small animal model showed that the material was well-tolerated with no signs of inflammation or harmful by-products. Remarkably, the processed alloy supported bone until it healed till eight weeks with a low in vivo corrosion rate of 0.7 mm/year. Moreover, we analyzed blood and histology of the critical organs such as liver and kidney, which showed normal functionality and consistent ion and enzyme levels, throughout the 12- week study period. These results demonstrate that the processed Mg-Zn-RE-Zr alloy offers promising potential for osseointegration in bone tissue healing while also exhibiting controlled biodegradability due to its engineered microstructure. The results from the present study will have profound benefit for bone fracture management, particularly in pediatric and elderly patients.

关键词： Biodegradable magnesium Bone healing Friction stir processing Microstructure Corrosion resistance

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