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Investigation of thermal parameters in numerical modeling of the laser powder bed fusion process for maraging 300 steel

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materials science and engineering: B 2025年 321卷

作者： Bruno Caetano dos Santos Silva Lucas de Figueiredo Soares Luã Fonseca Seixas J.P. Oliveira Jiajia Shen Rodrigo Santiago Coelho Gilmar Ferreira Batalha SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã Sao Paulo 05508-030 SP Brazil SENAI CIMATEC University Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata 41650-010 Salvador-BA Brazil CENIMAT | i3N Department of Materials Science School of Science and Technology NOVA University Lisbon Caparica Portugal

The development of numerical simulations for metal additive manufacturing (AM) processes to predict distortion and residual stress is considered a strategic tool for supporting the industrialization of AM. However, the complexity of these analyses, due to the intricacies of thermal cycles, demands substantial computational resources and a deep understanding of the key process variables to achieve accurate models. This study aims to evaluate the influence of thermal parameters on the results of thermomechanical simulations using the Inherent Strain Method (ISM). Specifically, the analysis investigates the effects of estimated peak temperatures on thermal analyses, distortion, equivalent stress, and microstructure volume fraction in maraging 300 steel (MS300) parts simulated via finite elements. The results indicate that varying the peak temperature of the models causes a linear change in the thermal simulation output, referred to as the exposed energy fraction (EEF) in the Simufact Additive software, which determines the thermal history of the process in fabricated geometry. However, the distortion behavior—by the mechanical analyses that used the EEF as input—deviated from this linearity across specific regions, emphasizing the need for localized accuracy assessment within complex geometries. Equivalent stress decreased with lower peak temperatures, highlighting a correlation between these factors, while the microstructure volume fraction remained unchanged across different peak temperatures. The simulation results were validated by comparing the simulated measurements with experimental data of the same geometry manufactured via laser powder bed fusion (LPBF). Displacement in the simulation was assessed by comparing the diameters of the front and back faces, as well as through surface deviation analysis, which highlighted variations between the scanned experimental geometry and the simulated part. Additionally, the microstructure of the experimental part was examine

关键词： Thermal cycling

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Bioinspired graphene-based silver nanoparticles: Fabrication, characterization and antibacterial activity 11

Bioinspired graphene-based silver nanoparticles: Fabrication...

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11th National Conference on Solid State Chemistry and Allied Areas, NCSCA 2019

作者： Potbhare, Ajay K. Umekar, Mayuri S. Chouke, Prashant B. Bagade, Mahendra B. Tarik Aziz, S.K. Abdala, Ahmed A. Chaudhary, Ratiram G. Post Graduate Department of Chemistry Seth Kesarimal Porwal College of Arts Commerce and Science Kamptee441001 India Bar Ilan University Ramat-Gan52900 Israel Chemical Engineering Program Texas AandM University at Qatar POB 23784 Doha Qatar

Herein we present a fabrication and antibacterial assays of novel silver nanoparticles (Ag NPs) on the surface of graphene oxide (GO) nanosheets as a multifunctional antibacterial material by using Pseudomonas aeruginosa biomass extract the nanocomposites has fabricated. as a synthesized material were characterized by spectroscopic technique including XRD, FTIR, EDX, Raman and TEM. XRD analysis specified the cubic crustal structure of NCs, while TEM rendered an average particle size of 25»nm of Ag-GO NCs. As a result, the fabricated Ag-GO NCs was tested against gram-positive and gram-negative strains and the results shows the Ag-GO NCs to be more effective against gram-negative bacteria (***). © 2019 Elsevier Ltd.

关键词： Graphene

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Bridging particle deformability and collective response in soft solids

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Physical Review materials 2021年第5期5卷 055605-055605页

作者： John D. Treado Dong Wang Arman Boromand Michael P. Murrell Mark D. Shattuck Corey S. O'Hern Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Biomedical Engineering Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Systems Biology Institute Yale University West Haven Connecticut 06516 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Soft, amorphous solids such as tissues, foams, and emulsions are composed of deformable particles. However, the effect of single-particle deformability on the collective behavior of soft solids is still poorly understood. We perform numerical simulations of two-dimensional jammed packings of explicitly deformable particles to study the mechanical response of model soft solids. We find that jammed packings of deformable particles with excess shape degrees of freedom possess low-frequency quartic vibrational modes that stabilize the packings even though they possess fewer interparticle contacts than the nominal isostatic value. Adding intraparticle constraints can rigidify the particles, but these particles undergo a buckling transition and gain an effective shape degree of freedom when their preferred perimeter is above a threshold value. We find that the mechanical response of jammed packings of deformable particles with shape degrees of freedom differs significantly from that of jammed packings of rigid-shape particles, which emphasizes the importance of particle deformability in modeling soft solids.

关键词： Collective behavior Jamming Emulsions Foams Tissues Molecular dynamics

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Experimental study on capillarity and thermal of metal foam as the wick structure in heat pipe application

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AIP Conference Proceedings 2023年第1期2865卷

作者： Syahrul Humaidi Doli Bonardo Dahniar Hasibuan Perdamean Sebayang Achmad Maulana Soehada Post Graduate Program (Physics) FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan 20155 Indonesia Refrigeration and Air Conditioning Engineering Study Program Politeknik Tanjungbalai Jl. Sei Raja Sei Tualang Raso Tanjungbalai 21345 Indonesia Research Center for Advanced Materials National Research and Innovation Agency (BRIN) Tangerang Selatan Banten 15314 Indonesia. Department of Physics Universitas Sutomo Serang Banten 42183 Indonesia

Metal foam as a wick structure in heat pipe applications is analyzed in terms of its capillary and thermal properties to determine the perspectives and challenges ahead. The surface coating of metal foam with a hydrophobic layer was analyzed for its effect on the overall capillarity in order to determine the optimal metal foam as a wick structure in the heat pipe. The hydrophobic coating is applied by a simple spray technique to the entire surface of the metal foam with repetition. Metal foam without a hydrophobic layer has stable capillarity properties among other samples, this indicates that the hydrophobic layer can inhibit the ferro fluid flow rate in the metal foam pore network as a whole as a result of the interaction between the metal foam phases and the hydrophobic layer. Metal foam 15 PPI without hydrophobic coating has an even and stable heat distribution, high conductivity and low resistivity which is suitable for application as a wick structure in heat pipes.

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Influence of Morphology on Fracture Propagation of PMMAe/PC Blend in Tensile Tests at High Strain Rate

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Macromolecular Symposia 2020年第1期394卷 2000153-2000153页

作者： Gomes, Felipe Pedro da Costa Reinaldo, Juciklécia da Silva Rodrigues, Antônio Henrique Venâncio de Macedo, Thatiana Cristina Pereira Silva, Bismarck Luiz Ito, Edson Noriyuki Graduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil Mechanical Engineering Department Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil Graduate Program in Materials Science and Engineering Federal University of Sergipe Avenida Marechal Rondon s/n 49100-000 São CristóvãoSergipe Brazil Materials Engineering Department Federal University of Rio Grande do Norte Avenida Senador Salgado Filho 3000 NatalRio Grande do Norte59078–970 Brazil

The aim of this study is to evaluate toughness mechanism of elastomeric poly(methyl methacrylate) (PMMAe) and polycarbonate (PC) blend through crack propagation at high speed tensile tests. Samples are processed using two types of extruders, single and twin screw, in order to eliminate the influence of processing in the final product's properties. Pure polymers and polymer blend samples are cryo-ultramicrotomed and their morphology is characterized using atomic force microscopy (AFM). Fractured samples obtained from uniaxial tensile tests at high strain rate are inspected using optical microscopy (OM) and scanning electron microscopy (SEM). The results obtained for the PMMAe/PC blend in tests at high deformation rate showed that the shear rate during the mixing process influences the maximum strength of the polymer blend near its region of co-continuous morphology. The visual evaluation of the fracture surface and the fractographic analysis corroborated the results of this study of polymer toughening. © 2020 Wiley-VCH GmbH

关键词： Fracture

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Terahertz cavity magnon polaritons

arXiv

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arXiv 2023年

作者： Kritzell, T. Elijah Baydin, Andrey Tay, Fuyang Rodriguez, Rodolfo Nojiri, Hiroyuki Everitt, Henry O. Barsukov, Igor Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Physics and Astronomy University of California RiversideCA92521 United States Institute for Materials Research Tohoku University Sendai980-8577 Japan DEVCOM Army Research Laboratory-South HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Hybrid light-matter coupled states, or polaritons, in magnetic materials have attracted significant attention due to their potential for enabling novel applications in spintronics and quantum information processing. However, most studies to date have been carried out for ferromagnetic materials with magnon excitations at gigahertz frequencies. Here, we have investigated strong resonant photon-magnon coupling at frequencies above 1 terahertz for the first time in a prototypical room-temperature antiferromagnetic insulator, NiO, inside a Fabry-Pérot cavity. The cavity was formed by the crystal itself when it was thinned down to an optimized thickness. By using terahertz time-domain spectroscopy in high magnetic fields up to 25 T, we swept the magnon frequency through Fabry-Pérot cavity modes and observed photon-magnon anticrossing behavior, demonstrating clear vacuum Rabi splittings exceeding the polariton linewidths. These results show that NiO is a promising platform for exploring antiferromagnetic spintronics and cavity magnonics in the terahertz frequency range. Copyright © 2023, The Authors. All rights reserved.

关键词： Polariton

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Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film

arXiv

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arXiv 2024年

作者： Ren, Zheng Huang, Jianwei Tan, Hengxin Biswas, Ananya Pulkkinen, Aki Zhang, Yichen Xie, Yaofeng Yue, Ziqin Chen, Lei Xie, Fang Allen, Kevin Wu, Han Ren, Qirui Rajapitamahuni, Anil Kundu, Asish K. Vescovo, Elio Kono, Junichiro Morosan, Emilia Dai, Pengcheng Zhu, Jian-Xin Si, Qimiao Minár, Ján Yan, Binghai Yi, Ming Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot Israel New Technologies-Research Center University of West Bohemia Plzeň301 00 Czech Republic Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States National Synchrotron Light Source II Brookhaven National Lab UptonNY United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Theoretical Division Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM United States

Magnetic kagome materials provide a fascinating playground for exploring the interplay of magnetism, correlation and topology. Many magnetic kagome systems have been reported including the binary FemXn (X=Sn, Ge;m:n = 3:1, 3:2, 1:1) family and the rare earth RMn6Sn6 (R = rare earth) family, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase. While partially filling a kagome flat band is predicted to give rise to a Stoner-type ferromagnetism, experimental visualization of the magnetic splitting across the ordering temperature has not been reported for any of these systems due to the high ordering temperatures, hence leaving the nature of magnetism in kagome magnets an open question. Here, we probe the electronic structure with angle-resolved photoemission spectroscopy in a kagome magnet thin film FeSn synthesized using molecular beam epitaxy. We identify the exchange-split kagome flat bands, whose splitting persists above the magnetic ordering temperature, indicative of a local moment picture. Such local moments in the presence of the topological flat band are consistent with the compact molecular orbitals predicted in theory. We further observe a large spin-orbital selective band renormalization in the Fe dxy+dx2-y2spin majority channel reminiscent of the orbital selective correlation effects in the iron-based superconductors. Our discovery of the coexistence of local moments with topological flat bands in a kagome system echoes similar findings in magic-angle twisted bilayer graphene, and provides a basis for theoretical effort towards modeling correlation effects in magnetic flat band systems. © 2024, CC BY.

关键词： Iron-based Superconductors

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Observation of current-induced switching in non-collinear antiferromagnetic IrMn3 by differential voltage measurements

arXiv

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arXiv 2021年

作者： Arpaci, Sevdenur Lopez-Dominguez, Victor Shi, Jiacheng Sánchez-Tejerina, Luis Garesci, Francesca Wang, Chulin Yan, Xueting Sangwan, Vinod K. Grayson, Matthew Hersam, Mark C. Finocchio, Giovanni Amiri, Pedram Khalili Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina Messina98166 Italy Department of Engineering University of Messina Messina98166 Italy Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States

There is accelerating interest in developing memory devices using antiferromagnetic (AFM) materials, motivated by the possibility for electrically controlling AFM order via spin-orbit torques, and its read-out via magnetoresistive effects. Recent studies have shown, however, that high current densities create non-magnetic contributions to resistive switching signals in AFM/heavy metal (AFM/HM) bilayers, complicating their interpretation. Here we introduce an experimental protocol to unambiguously distinguish current-induced magnetic and nonmagnetic switching signals in AFM/HM structures, and demonstrate it in IrMn3/Pt devices. A six-terminal double-cross device is constructed, with an IrMn3 pillar placed on one cross. The differential voltage is measured between the two crosses with and without IrMn3 after each switching attempt. For a wide range of current densities, reversible switching is observed only when write currents pass through the cross with the IrMn3 pillar, eliminating any possibility of non-magnetic switching artifacts. Micromagnetic simulations support our findings, indicating a complex domain-mediated switching process. © 2021, CC BY.

关键词： Binary alloys

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Retraction notice to "Organic composts as A vehicle for the entry of microplastics into the environment: A comprehensive review" [Sci. Total Environ. 892 (2023) 164758]

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The science of the total environment 2024年 957卷 177731页

作者： Van-Re Le Minh-Ky Nguyen Hoang-Lam Nguyen Chitsan Lin Md Refat Jahan Rakib Van-Anh Thai Van-Giang Le Guilherme Malafaia Abubakr M Idris Ho Chi Minh City University of Food Industry (HUFI) 140 Le Trong Tan Street Tan Phu District Ho Chi Minh City 700000 Viet Nam. Faculty of Environment and Natural Resources Nong Lam University of Ho Chi Minh City Hamlet 6 Linh Trung Ward Thu Duc City Ho Chi Minh City 700000 Viet Nam Ph.D. Program in Maritime Science and Technology National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan. Department of Civil Engineering McGill University Montreal Canada. Ph.D. Program in Maritime Science and Technology National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung 81157 Taiwan. Department of Fisheries and Marine Science Faculty of Science Noakhali Science and Technology University Noakhali 3814 Bangladesh. Institute of Aquatic Science and Technology National Kaohsiung University of Science and Technology Kaohsiung City 81157 Taiwan. Central Institute for Natural Resources and Environmental Studies Vietnam National University Hanoi 111000 Viet Nam. Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil. Department of Chemistry College of Science King Khalid University 61431 Abha Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha 61421 Saudi Arabia.

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Coulomb interaction-driven reshaped weyl fermionic dispersions in MoTe2

arXiv

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arXiv 2021年

作者： Kang, Seoung-Hun Jeon, Sangjun Kim, Hyun-Jung Ko, Wonhee Cho, Suyeon Kang, Se Hwang Kim, Sung Wng Yang, Heejun Kim, Hyo Won Son, Young-Woo Korea Institute for Advanced Study Seoul02455 Korea Republic of Department of Physics Chung-Ang University Seoul06974 Korea Republic of Peter Grünberg Institute Institute for Advanced Simulation Forschungszentrum Jülich Jülich52428 Germany Samsung Advanced Institute of Technology Suwon16678 Korea Republic of Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul03760 Korea Republic of Department of Energy Science Sungkyunkwan University Suwon16419 Korea Republic of Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals. © 2021, CC BY-NC-ND.

关键词： Dispersions

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