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Influence of Al-5.0Nb-0.5B inoculant on the microstructure and mechanical properties of AA 2017 alloy fabricated using laser-based powder bed fusion

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Journal of Alloys and Compounds 2025年 1032卷

作者： dos Santos Bomfim, Pamela Karina Batistão, Bruna Fernanda de Araújo, Aylanna Priscila Marques Pereira, Leandro Henrique Buzolin, Ricardo Henrique Amancio-Filho, Sergio T. Afonso, Conrado Ramos Moreira Bolfarini, Claudemiro Kiminami, Claudio Shyinti Coury, Francisco Gil Gargarella, Piter Graduate Program in Materials Science and Engineering Federal University of São Carlos Rod.Washington Luis Km 235 SP São Carlos13565-905 Brazil High Performance and Lightweight Materials Group kopernikusgasse 24 Graz8010 Austria BMK Endowed Professorship for Aviation Kopernikusgasse 24 Graz8010 Austria Institute of Materials Science Joining and Forming Graz University of Technology Kopernikugasse 24/l Graz80210 Austria Rod. Washington Luiz km 235 São Carlos13565-905 Brazil Center of Characterization and Development of Materials Federal University of São Carlos Rod. Washington Luiz km 235 SP-310 SP São Carlos13565-905 Brazil

This study investigated the influence of the inoculant Al-5.0Nb-0.5B on the microstructure and mechanical properties of the AA 2017 alloy fabricated using laser-based powder bed fusion (L-PBF). The AA 2017 alloy powder was obtained through gas atomization and then mixed with 2 wt% of Al-5.0Nb-0.5B powder (20–53 µm) and synthesized using the L-PBF technique. The small addition of the Al-5.0Nb-0.5B, coupled with specific processing parameters, led to a reduction in the fraction of cracks and transformed the solidification structure from cellular to equiaxial. Additionally, it resulted in a grain size reduction down to 4.0 ± 2.9 µm and a low fiber texture. Due to the refined grains, the AA 2017 samples with 2 wt% Al-5.0Nb-0.5B exhibited a high yield strength of 215 ± 33 MPa and ultimate compressive strength of 602 ± 47 MPa, compared to the AA 2017 alloy samples, which exhibited yield strength of 171 ± 8 MPa and ultimate compressive strength of 427 ± 46 MPa. The addition of a small fraction of Al-5.0Nb-0.5B to the AA 2017 alloy, produced by L-PBF, is a promising alternative for manufacturing lightweight parts with a lower amount of hot cracks and equiaxial microstructure. The results show that the use of inoculant with the micrometric size is an effective alternative to the use of nanoparticles, which has a higher safety risk, is usually difficult to homogenize and may promote agglomeration. © 2025 Elsevier B.V.

关键词： Compressive strength

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Resonant photonic structures in porous silicon for biosensing 9

Resonant photonic structures in porous silicon for biosensin...

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Frontiers in Biological Detection: From Nanosensors to Systems IX

作者： Zhao, Yiliang Rodriguez, Gilberto A. Graham, Yasmin M. Cao, Tengfei Gaur, Girija Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University NashvilleTN37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering University of Maryland Baltimore County BaltimoreMD21250 United States

ISBN: (数字)9781510606043

ISBN: (纸本)9781510606036

The formation of resonant photonic structures in porous silicon leverages the benefit of high surface area for improved molecular capture that is characteristic of porous materials with the advantage of high detection sensitivity that is a feature of resonant optical devices. This review provides an overview of the biosensing capabilities of a variety of resonant porous silicon photonic structures including microcavities, Bloch surface waves, ring resonators, and annular Bragg resonators. Detection sensitivities > 1000 nm/RIU are achieved for small molecule detection. The challenge of detecting molecules that approach and exceed the pore diameter is also addressed. © 2017 SPIE.

关键词： Porous silicon

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Low-temperature spin Seebeck effect in nonmagnetic vanadium dioxide

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Physical Review B 2024年第2期110卷 024415-024415页

作者： Renjie Luo Tanner J. Legvold Liyang Chen Henry Navarro Ali C. Basaran Deshun Hong Changjiang Liu Anand Bhattacharya Ivan K. Schuller Douglas Natelson Department of Physics and Astronomy Applied Physics Graduate Program Rice Quantum Institute Department of Physics and Center for Advanced Nanoscience Materials Science Division Department of Electrical and Computer Engineering Department of Materials Science and NanoEngineering

The spin Seebeck effect (SSE) is sensitive to thermally driven magnetic excitations in magnetic insulators. Vanadium dioxide in its insulating low-temperature phase is expected to lack magnetic degrees of freedom, as vanadium atoms are thought to form singlets upon dimerization of the vanadium chains. Instead, we find a paramagnetic SSE response in VO2 films that grows as the temperature decreases below 50 K. The field and temperature-dependent SSE voltage is qualitatively consistent with a general model of paramagnetic SSE response and inconsistent with triplet spin transport. Quantitative estimates find a spin Seebeck coefficient comparable in magnitude to that observed in strongly magnetic materials. The microscopic nature of the magnetic excitations in VO2 requires further examination.

关键词： Spin Seebeck effect Paramagnets Strongly correlated systems

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Using 4D-STEM to Map 3D Morphologies of 2D materials

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 262-263页

作者： Mireles, Adan Shi, Chuqiao Park, Jeongwon Shin, Bongki Sung, Suk Hyun Ophus, Colin Hovden, Robert Kang, Kibum Han, Yimo Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX United States Department of Materials Science and NanoEngineering Rice University Houston TX United States Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA United States

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Study on chemotaxis and chemokinesis of bone marrow-derived mesenchymal stem cells in hydrogel-based 3D microfluidic devices

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Biomaterials Research 2016年第1期20卷 1-8页

作者： Yoon, Dayoung Kim, Hyerim Lee, Eojin Park, Min Hee Chung, Seok Jeon, Hojeong Ahn, Cheol-Hee Lee, Kangwon Center for Biomaterials Korea Institute of Science and Technology Seoul South Korea Research Institute of Advanced Materials (RIAM) Department of Materials Science and Engineering Seou National University Seoul South Korea Program in Nanoscience and Technology Graduate School of Convergence Science and Technology Seou National University Seoul South Korea School of Mechanical Engineering Korea University Seoul South Korea Advanced Institutes of Convergence Technology Gyeonggi-do South Korea

Background: Controlling the fate of mesenchymal stems cells (MSCs) including proliferation, migration and differentiation has recently been studied by many researchers in the tissue engineering field. Especially, recruitment of stem cells to injury sites is the first and crucial step in tissue regeneration. Although significant progress has been made in the chemotactic migration of MSCs, MSC migration in three dimensional environments remains largely unknown. We developed a 3D hydrogel-based microfluidic-device to study the migration behavior of human MSCs in the presence of stromal-cell derived factor-1α (SDF-1α), interleukin 8 (IL-8) and Substance P (SP) which have been utilized as chemoattractant candidates of human mesenchymal stem cells (hMSCs). Results: We systematically investigated the chemotactic migration behaviors of hMSCs and their responses to SDF-1a, IL-8, and SP. SDF-1α was shown to be the most fascinating chemoattractant candidate among those factors at a certain time point. We also found that each chemokine showed different chemoattractant abilities according to their concentration. In the case of SP, this factor showed chemokinesis not chemotaxis. Especially at a 7-8×10^-8 M concentration range, the chemokinesis ability driven by SP was further increased. The data suggest that some factors at the optimal concentration exhibit chemokinesis or chemotaxis in a 3D hydrogel-based microfluidic device. Conclusion: In this study on chemotaxis and chemokinesis of hMSCs, the system parameters such as chemokine concentration, system stability, and 2D or 3D microenvironment are critically important to obtain meaningful results. © 2016 The Author(s).

关键词： Chemokinesis Chemotaxis Mesenchymal stem cells Microfluidic device

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Correlating the Ambient Conditions and Performance Indicators of the LoRaWAN via Surrogate Gaussian Process-Based Bidirectional LSTM Stacked Autoencoder

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IEEE Transactions on Network and Service Management 2023年第3期20卷 3413-3427页

作者： Bhat, Showkat Ahmad Huang, Nen-Fu Hussain, Imtiyaz Sajjad, Uzair National Tsing Hua University College of Electrical and Computer Science Hsinchu1300044 Taiwan National Tsing Hua University Department of Computer Science Hsinchu1300044 Taiwan National Taipei University of Technology Graduate Program in Energy and Opto-Electronic Materials Taipei10608 Taiwan National Taipei University of Technology Department of Energy and Refrigerating Airconditioning Engineering Taipei10608 Taiwan

LoRa's biggest advantage is its flexibility, which is the ability to increase or decrease data rate and range while decreasing or increasing sensitivity. Whenever propagation conditions change frequently, this function allows the spreading factor to be modified accordingly. Despite their efficiency and scalability, adaptive data rate algorithms ignore and fail to factor in the complex correlation between ambient weather parameters influencing the communication channel design. In this research, a Bayesian surrogate Gaussian process-based bidirectional LSTM stacked autoencoder model (BSGP-BLSTM-SAE) is proposed to estimate the channel performance indicators such as received signal strength indicator (RSSI) and signal-to-noise ratio (SNR) and to determine the correlation between the ambient weather conditions and performance indicators for the LoRaWAN network. Bayesian optimization algorithm has been used to optimize the hyper-parameters of the developed model. A LoRaWAN experimental multivariate time series dataset has been used for the evaluation of the developed model, which upon testing and validation produces high accuracy in predicting the channel performance indicators and ambient conditions of the experimental LoRaWAN network. The mean absolute error of the developed model was around 0.45. Thus, the proposed model can predict the link performance indicators and thereby assist in real-time optimization of the transmission parameters to enhance the network performance in LoRaWAN-based systems at different ambient conditions. © 2004-2012 IEEE.

关键词： Internet of things

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Self-Attenuating Graphene-Based Antennas Utilizing Polyvinylidene Fluoride (PVDF) Substrates

Self-Attenuating Graphene-Based Antennas Utilizing Polyvinyl...

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Microwave and Antenna Symposium (IMAS), International

作者： Josef Frankhouse Evans Addo-Mensah Uche Wejinya Department of Mechanical Engineering University of Arkansas - Fayetteville Materials Science and Engineering Graduate Program University of Arkansas - Fayetteville

ISBN: (数字)9798350356359

ISBN: (纸本)9798350356366

In this study, a Terahertz (THz) band antenna which can regulate its own resonant frequency without the requirement of manual adjustment is simulated. A polyvinylidene fluoride (PVDF) substrate is applied onto a rectangular graphene patch antenna. With a voltage potential applied onto the PVDF, the patch antenna can attenuate its frequency by physically changing the shape of the antenna, and in turn its resonant frequency. These antennas are within a 0.1 THz band between 1.32 THz to 1.22 THz measured from a radial bend of a flat surface to r = 75 μm, fitting into a return loss (S11) above -30 dB. Although the return loss did not show consistency, the resonating frequency shifted at a linear rate relative to the cylindrical bending.

关键词： Microwave antennas Patch antennas Graphene Resonant frequency Prototypes Bandwidth Bending Loss measurement Substrates Terahertz communications

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Effects of laser-peening parameters on plastic deformation of SUS316L

Effects of laser-peening parameters on plastic deformation o...

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31st International Congress on Applications of Lasers and Electro-Optics, ICALEO 2012

作者： Mizuta, Kohei Tsuyama, Miho Takahashi, Makoto Shibayanagi, Toshiya Nakano, Hitoshi Program in Electronic Engineering Interdisciplinary Graduate Faculty of Science and Engineering Kinki University 3-4-1 Kowakae Higashi-osaka Osaka 577-8502 Japan Joining and Welding Research Institute Osaka University 11-1 Mihoga-oka Ibaraki Osaka 567-0047 Japan Program in Materials Science and Engineering Faculty of Engineering Toyama University 3190 Gofuku Toyama Toyama 930-8555 Japan

Effects of laser-peening parameters on plastic deformation have been investigated through hardness measurements. The laser-peening parameter consisting of laser parameters, pressure of laser-produced plasma, propagation of laser-induced shock wave and initial state of target material should be optimized for efficient laser peening. The laser parameters are one of the important factor, thus laser intensity and coverage which corresponds to the number of laser shots irradiated per unit of area have been changed to estimate the laser peening effect in this study. Second harmonic of Nd:YAG laser having the pulse duration of 4 ns has been used. Commercial SUS316L stainless steel has been adopted as a sample. The samples were investigated under nanosecond laser-shock loading in plasma confined by water. Vickers microhardness is used to probe work hardening due to plastic deformation induced by laser peening. Through hardness measurements, it is found that desirable coverage for producing the plastic deformation has been existed, which depends on the laser irradiation intensity.

关键词： Plastic deformation

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Identifying Prognostic Markers of Non-small Cell Lung Carcinoma Using Bioinformatics

Identifying Prognostic Markers of Non-small Cell Lung Carcin...

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International Conference on Industrial Instrumentation and Control,ICI2C 2021

作者： Khan, Siladitya Chakraborty, Debamitra Department of Biomedical Engineering University of Rochester RochesterNY14627 United States Goergen Institute for Data Science University of Rochester RochesterNY14627 United States Materials Science Graduate Program University of Rochester RochesterNY14627 United States

ISBN: (纸本)9789811670107

We present a transcriptomics pipeline for performing the functional analysis of array expression profiling data of normal and adenocarcinoma lung tissue. Our aims are twofold, firstly to elucidate molecular processes that transform normal tissue, to a lung adenocarcinoma. Following this, we perform functional analysis to screen potential hub genes and demonstrate their value in cancer prognosis. Analysis was performed on a total of 500 differentially expressed genes (DEG), screened for their regulation and transcriptional modulation in a female population carrying non–small cell lung carcinoma (NSCLC). Key pathways like cytokine-cytokine receptors, ECM receptor interactions, and TNF signaling were identified suggesting a potential role in lung tumorigenesis. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Bioinformatics

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Which glass stability parameters can assess the glass-forming ability of oxide systems?

arXiv

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arXiv 2020年

作者： Jiusti, Jeanini Cassar, Daniel R. Zanotto, Edgar D. Department of Materials Engineering Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos SP Brazil

Glass forming ability (GFA) is a property of utmost importance in glass science and technology. In this paper, we used a statistical methodology-involving bootstrap sampling and the Wilcoxon test-to find out which glass stability parameters can better predict the glass forming ability. We collected or measured the necessary data for twelve stoichiometric oxide glasses that underwent predominant heterogeneous nucleation (the most common case). We found that some GS parameters could predict the GFA of these oxide glasses quite well, whereas others perform poorly. Parameter Kw was the top ranked, closely followed by the KH, γ, H', ΔTrg, and Kcr. Our results corroborate previous reports carried out using a smaller number of glasses, much less GS parameters, and less rigorous statistics. We also found that using Tc instead of Tx improved the predictive power of these parameters. Finally, the Jezica, the only parameter considered here that predicts the GFA without requiring the production of a glass piece (i.e., without relying on any crystallization information), ranked reasonably well in our analysis. Copyright © 2020, The Authors. All rights reserved.

关键词： Nucleation

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