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Stacking-fault networks with Lomer-Cottrell locks induced by carbon addition in a severely strained Cr-Co-Ni alloy

Journal of Alloys and Compounds 2025年 1033卷

作者： Guilherme Cardeal Stumpf Gustavo Bertoli Francisco Gil Coury Augusta Cerceau Isaac Neta Luciano Andrey Montoro Roberto Braga Figueiredo Witor Wolf Graduate Program in Metallurgical Materials and Minning Engineering Federal University of Minas Gerais Belo Horizonte MG 31270-901 Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos Rod. Washington Luiz Km 235 São Carlos SP 13565-905 Brazil Department of Materials Engineering Federal University of São Carlos São Carlos SP 13565-905 Brazil Department of Metallurgical and Materials Engineering Federal University of Minas Gerais Av. Antônio Carlos 6627 Belo Horizonte MG 31270-901 Brazil Department of Chemistry Federal University of Minas Gerais Av. Antônio Carlos 6627 Belo Horizonte MG 31270-901 Brazil Department of Materials Engineering São Carlos School of Engineering University of São Paulo (EESC–USP) São Carlos SP 13563-120 Brazil

Face-centered cubic (FCC) Cr-Co-Ni multi-principal element alloys are among the toughest materials ever designed. The optimal trade-off between strength and ductility shown by these materials is tied with their deformation evolution. Typically, their plastic deformation starts with dislocation slip, followed by mechanical twinning (i.e., twinning induced plasticity, TWIP) and, as strain levels further increase, phase transformation induced by plasticity (TRIP). This work evaluates the deformation substructure of a highly strained (achieved with high-pressure torsion) Cr 40 Co 30 Ni 30 (at%) alloy with and without carbon alloying. After processing, the carbon-free alloy developed a typical substructure observed in FCC Medium/High-entropy alloys at later stages of straining, characterized by the presence of nanotwins and HCP lamellae, resulting in a 5.9 GPa hardness. In contrast, carbon addition induced grain refinement and suppression of the TWIP and TRIP effects. Notably, the Cr 39.6 Co 30 Ni 30 C 0.4 alloy developed networks of stacking faults with partial dislocations and Lomer-Cottrell locks, which primarily contributed to a stronger hardening capability, resulting in an increased hardness of 7.3 ± 0.8 GPa, 22 % (1.3 GPa) higher than the base alloy. These findings have important implications for better understanding the deformation substructure evolution of FCC multi-principal element alloys and can pave the way forward in regard to the design approaches for carbon-alloying in these materials.

关键词： Plastic flow

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Loss tangent fluctuations due to two-level systems in superconducting microwave resonators

arXiv

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arXiv 2024年

作者： Vallières, André Russell, Megan E. You, Xinyuan Garcia-Wetten, David A. Goronzy, Dominic P. Walker, Mitchell J. Bedzyk, Michael J. Hersam, Mark C. Romanenko, Alexander Lu, Yao Grassellino, Anna Koch, Jens McRae, Corey Rae H. Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Center for Applied Physics and Superconducting Technologies Northwestern University EvanstonIL60208 United States Electrical Computing and Energy Engineering Department University of Colorado BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States National Institute of Standards and Technology BoulderCO80305 United States

Superconducting microwave resonators are critical to quantum computing and sensing technologies. Additionally, they are common proxies for superconducting qubits when determining the effects of performance-limiting loss mechanisms such as from two-level systems (TLS). The extraction of these loss mechanisms is often performed by measuring the internal quality factor Qi as a function of power or temperature. In this work, we investigate large temporal fluctuations of Qi at low powers over periods of 12 to 16 hours (relative standard deviation σQi/Qi = 13%). These fluctuations are ubiquitous across multiple resonators, chips and cooldowns. We are able to attribute these fluctuations to variations in the TLS loss tangent due to two main indicators. First, measured fluctuations decrease as power and temperature increase. Second, for interleaved measurements, we observe correlations between low- and medium-power Qi fluctuations and an absence of correlations with high-power fluctuations. Agreement with the TLS loss tangent mean is obtained by performing measurements over a time span of a few hours. We hypothesize that, in addition to decoherence due to coupling to individual near-resonant TLS, superconducting qubits are affected by these observed TLS loss tangent fluctuations. © 2024, CC BY.

关键词： Qubits

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Zirconium Diboride as the Protective Layer for Stable Aqueous Zinc-Ion Batteries with Long Cycle Life

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Electrochimica Acta 2025年 535卷

作者： Fang-Chia Kuo Hsin-I Tsai Tuan-Yue Lin Fan-Wei Liu Yu-Ze Chen Department of Materials Science and Engineering National Cheng Kung University Tainan City 70101 Taiwan Graduate Degree Program in Semiconductor and Green Technology Academy of Circular Economy National Chung Hsing University. Taichung City 40202 Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan City 70101 Taiwan Program on Semiconductor Packaging and Testing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan City 70101 Taiwan

Integrating intermittent renewable energy sources with battery energy storage systems is imperative to achieve sustainable development and net-zero emissions. Despite widespread adoption, lithium-ion batteries (LIBs) face inherent challenges, including safety concerns and environmental pollution. In contrast, aqueous zinc-ion batteries (AZIBs) have garnered significant attention due to their intrinsic non-flammability, cost-effectiveness, and environmental compatibility. However, the practical application of Zn foil anodes is hindered by issues such as non-uniform Zn deposition and severe corrosion, which degrade battery performance and longevity. This study investigates zirconium diboride (ZrB₂) as a protective coating for Zn anodes to mitigate dendritic challenges and enhance battery lifespan. Coating the ZrB₂ layer on the Zn anode significantly reduces the nucleation overpotential to 23.8 mV and enables stable cycling of symmetrical cells for 4500 hours at a current density of 1 mA cm⁻² and an areal capacity of 0.5 mA h cm⁻². Furthermore, the ZrB₂@Zn//VOx pouch cell exhibits stable cycling for 600 cycles under various bending conditions without short-circuit failure, demonstrating superior mechanical flexibility and reliability. This work introduces ZrB₂ as a promising protective material for high-performance AZIBs and provides valuable insights into the application of ceramic coatings for stabilizing Zn anodes, paving the way for the advancement of next-generation aqueous energy storage systems.

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Incommensurate magnetic orders and topological Hall effect in the square-net centrosymmetric EuGa2Al2 system

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Physical Review materials 2022年第7期6卷 074201-074201页

作者： Jaime M. Moya Shiming Lei Eleanor M. Clements Caitlin S. Kengle Stella Sun Kevin Allen Qizhi Li Y. Y. Peng Ali A. Husain Matteo Mitrano Matthew J. Krogstad Raymond Osborn Anand B. Puthirath Songxue Chi L. Debeer-Schmitt J. Gaudet P. Abbamonte Jeffrey W. Lynn E. Morosan Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA International Center for Quantum Materials School of Physics Peking University CN-100871 Beijing China Department of Physics and Astronomy and Quantum Matter Institute University of British Columbia Vancouver British Columbia Canada V6T 1Z1 Department of Physics Harvard University Cambridge Massachusetts 02138 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering University of Maryland College Park Maryland 20742-2215 USA

Neutron diffraction on the centrosymmetric square-net magnet EuGa2Al2 reveals multiple incommensurate magnetic states (AFM1, 2, 3) in zero field. In applied field, a new magnetic phase (A) is identified from magnetization and transport measurements, bounded by two of the μ0H=0 incommensurate magnetic phases (AFM1, helical, and AFM3, cycloidal) with different moment orientations. Moreover, magnetotransport measurements indicate the presence of a topological Hall effect, with maximum values centered in the A phase. Together, these results render EuGa2Al2 a material with noncoplanar or topological spin texture in applied field. X-ray diffraction reveals an out-of-plane (OOP) charge density wave (CDW) below TCDW∼50 K while the magnetic propagation vector lies in plane below TN=19.5 K. Together these data point to a new route to realizing in-plane noncollinear spin textures through an OOP CDW. In turn, these noncollinear spin textures may be unstable against the formation of topological spin textures in an applied field.

关键词： Charge density waves Exotic phases of matter Hall effect Magnetic phase transitions Magnetotransport Symmetry protected topological states Topological materials

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Correction: Advancements in additive manufacturing for video laryngoscopes: a comprehensive scoping and technological review

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Systematic reviews 2024年第1期13卷 31页

作者： Ana Cristina Beitia Kraemer Moraes Chiara das Dores do Nascimento Everton Granemann Souza Mauricio Beitia Kraemer Mauricio Moraes Neftali Lenin Villarreal Carreno Evandro Piva Rafael Guerra Lund Pelotas Dental School Graduate Program in Dentistry Federal University of Pelotas Pelotas RS 96010‑560 Brazil. Master's Degree in Electronic and Computer Engineering Center for Social and Technological Sciences Catholic University of Pelotas Pelotas RS 96015‑560 Brazil. Faculty of Medicine São Francisco University Bragança Paulista SP 12916‑900 Brazil. Faculty of Medicine Federal University of Pelotas Pelotas RS 96010‑560 Brazil. Graduate Program in Materials Science and Engineering Technological Development Center Federal University of Pelotas Pelotas RS 96010‑610 Brazil. Pelotas Dental School Graduate Program in Dentistry Federal University of Pelotas Pelotas RS 96010‑560 Brazil. rafael.lund@***. Graduate Program in Materials Science and Engineering Technological Development Center Federal University of Pelotas Pelotas RS 96010‑610 Brazil. rafael.lund@***.

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Foldaxane-Based Switchable [c2]Daisy Chains

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Angewandte Chemie 2024年第14期136卷

作者： Sibei Liao Jie Tang Chunmiao Ma Lu Yu Prof. Ying Tan Xuanzhu Li Prof. Quan Gan Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medical Hubei Engineering Research Center for Biomaterials and Medical Protective Materials School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Luoyu Road No. 1037 430074 Wuhan China State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical Biology Tsinghua Shenzhen International Graduate School Tsinghua University 518055 Shenzhen China

Artificial molecular muscles are highly attractive in the field of molecular machinery due to their unique properties of contraction and stretching motion. However, the synthesis of molecular muscles poses formidable challenges as it is hindered by undesirable yields and poor selectivity. Herein, we present a procedure for the dynamic assembly of foldaxane-based [ c 2]daisy chains, wherein the hermaphroditic sequences consisting of aromatic helices and peptide rods are interlocked through inter-strand hydrogen-bonding interactions. The binding complementarity facilitates a selective and efficient assembly of [ c 2]daisy chain structures, inhibiting the creation of by-products. Introducing multiple recognition sites confers the system with contraction and stretching motion actuated by chemical stimuli. The rate of this muscle-like motion is calculated to be 0.8 s −1 , which is 10 7 times faster than that of complex dissociation.

关键词： Cross-Threaded Structure Foldamers Foldaxanes Switchable Motion Molecular Muscles

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Giant Second-Order Nonlinearity and Anisotropy of Large-Sized Few-Layer SnS with Ferroelectric Stacking

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Advanced Optical materials 2024年第19期12卷

作者： Moqbel, Redhwan Nanae, Ryo Kitamura, Satsuki Lee, Ming-Hao Lan, Yann-Wen Lee, Chi-Cheng Nagashio, Kosuke Lin, Kung-Hsuan Department of Physics National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei106319 Taiwan Institute of Physics Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei115201 Taiwan Nano-Science and Technology Program Taiwan International Graduate Program Academia Sinica No. 128 Sec. 2 Academia Rd. Nangang Dist. Taipei115201 Taiwan Department of Materials Engineering The University of Tokyo 7-3-1 Hongo Tokyo Bunkyo113-8656 Japan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan The Key Consortium of Electron Microscopy National Taiwan University Taipei10617 Taiwan Department of Physics National Taiwan Normal University Taipei11677 Taiwan Department of Physics Tamkang University New Taipei Tamsui251301 Taiwan

The giant second-order nonlinearity of SnS with ferroelectric stacking is reported. Based on theoretical calculations, the susceptibility of second harmonic generation (SHG) from SnS with ferroelectric stacking is up to 1354 pm V−1, which is three orders of magnitude higher than the values of traditional nonlinear crystals such as BBO and KTP. The SHG from ferroelectric SnS few layers is experimentally measured and its intensity is found to be 131 times larger than that of a MoS2 monolayer under the same experimental conditions, with a photon energy of 1.55 eV. The SHG susceptibility is determined to be on the order of 100 pm V−1. Numerous SnS flakes are systematically investigated using polarization-resolved SHG. Micrometer-sized flakes with a single domain are found, and their SHG anisotropic patterns fit well with the theoretical calculations derived from first-principles methods. The variation in SHG anisotropic patterns, attributed to SHG interference from multiple domains, is investigated both theoretically and experimentally. Additionally, the impact of stacking disorder on the SHG anisotropic pattern is explored. It is demonstrated that polarization-resolved SHG microscopy is a valuable tool for identifying domains in SnS flakes and examining stacking disorder. © 2024 Wiley-VCH GmbH.

关键词： Harmonic generation

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Hexaazatriphenylene-Based Two-Dimensional Conductive Covalent Organic Framework with Anisotropic Charge Transfer

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Angewandte Chemie 2023年第42期135卷

作者： Seong-Wook Kim Hyeonjung Jung Dr. Mahmut Sait Okyay Dr. Hyuk-Jun Noh Sein Chung Young Hyun Kim Jong-Pil Jeon Prof. Dr. Bryan M. Wong Prof. Dr. Kilwon Cho Dr. Jeong-Min Seo Prof. Dr. Jung-Woo Yoo Prof. Dr. Jong-Beom Baek Department of Energy and Chemical Engineering/ Center for Dimension-Controllable Organic Frameworks Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea These authors contributed equally to this work School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea Materials Science & Engineering Program Department of Chemistry and Department of Physics & Astronomy University of California-Riverside Riverside CA 92521 USA Department of Chemistry Dartmouth College Hanover NH 03755 USA Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea School of Materials Science and Engineering/ Graduate School of Semiconductor Materials and Devices Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea

The development of covalent organic frameworks (COFs) with efficient charge transport is of immense interest for applications in optoelectronic devices. To enhance COF charge transport properties, electroactive building blocks and dopants can be used to induce extended conduction channels. However, understanding their intricate interplay remains challenging. We designed and synthesized a tailor-made COF structure with electroactive hexaazatriphenylene (HAT) core units and planar dioxin (D) linkages, denoted as HD-COF. With the support of theoretical calculations, we found that the HAT units in the HD-COF induce strong, eclipsed π–π stacking. The unique stacking of HAT units and the weak in-plane conjugation of dioxin linkages leads to efficient anisotropic charge transport. We fabricated HD-COF films to minimize the grain boundary effect of bulk COFs, which resulted in enhanced conductivity. As a result, the HD-COF films showed an electrical conductivity as high as 1.25 S cm −1 after doping with tris(4-bromophenyl)ammoniumyl hexachloroantimonate.

关键词： Anisotropic Charge Transfer Conductivity Covalent Organic Frameworks Doping

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Recycling of PE/PA/EVOH Multilayer Flexible Packaging Films via Reactive Compatibilization

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Journal of Applied Polymer science 2025年

作者： Barbosa, Felipe D. Staffa, Lucas H. Costa, Lidiane C. Graduate Program in Materials Science and Engineering Federal University of Sao Carlos São Carlos Brazil Packaging & Specialty Plastics Dow Brasil S.A. São Paulo Brazil São Carlos Brazil Federal University of São Carlos São Carlos Brazil

The recycling of a 7-layer co-extruded blown flexible film composed of polyethylene (LLDPE/LDPE blend), polyamide-6/6.6 (PA), and random copolymer of ethylene vinyl alcohol (EVOH) was assessed via reactive compatibilization using a maleic anhydride grafted polyethylene. Flat monolayer films were obtained from mechanical recycling of the multilayer film using a co-corotating twin screw extruder, with and without the compatibilizer. After that, they were characterized for their morphological, rheological, thermal, and mechanical properties. According to Harkin's spreading coefficient concept, the Relative Interfacial Energy (RIE) approach, and SEM images, a core-shell morphology was revealed, with the dispersed phase consisting of a thin EVOH layer and a PA6/6.6 copolymer core embedded within a continuous LLDPE/LDPE matrix. Adding up to 10 phr of the compatibilizer induced significant changes in the size and distribution of the dispersed phase. Moreover, compatibilized monolayer films exhibited enhanced mechanical properties, such as tensile, puncture, tear propagation strength, and dart drop impact resistance, compared to the uncompatibilized blend. Nonetheless, the compatibilizer presence negatively impacted the film's optical properties, although its clarity remained suitable for flexible packaging applications. © 2025 The Author(s). Journal of Applied Polymer science published by Wiley Periodicals LLC.

关键词： Tensile strength

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Unraveling the Cr 2 N Precipitation and Its Negative Effect on the Corrosion Resistance of Friction Stir Welded UNS S32760 Super Duplex Stainless Steel

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Surfaces and Interfaces 2025年 71卷

作者： G.S. Vacchi W.S. de Carvalho C.P. Meinhardt L.A. Bergmann S.T. Amancio-Filho C.A.D. Rovere Munir Rachid Corrosion Laboratory Department of Materials Engineering Federal University of São Carlos Rodovia Washington Luis Km 235 São Carlos SP 13565-905 Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos Brazil Institute of Materials Science Joining and Forming BMK Endowed Professorship for Aviation Graz University of Technology – TU Graz Kopernikusgasse 24/1 Graz 8010 Austria Department of Mechanical Engineering Federal University of Pampa Avenida Tiarajú 810 Alegrete RS Brazil Helmholtz-Zentrum Hereon Institute of Materials Mechanics Solid State Materials Processing Max-Planck-Straße 1 Geesthacht Germany

The root surface of a friction stir welded super duplex stainless steel (UNS S32760) was thoroughly characterized in this study. The findings revealed a refined grain structure and a conspicuous increase of 50 HV 0.3 in the Root’s hardness. Interestingly, the volume fraction of the ferrite phase remained largely unchanged. Rapid cooling in the welding process led to the Cr 2 N precipitation at the ferrite/ferrite grain boundaries in the root area, significantly increasing sensitization, reducing localized corrosion resistance under high electrode potentials in a neutral pH saline environment, and adversely affecting root passivity in a hydrochloric acid environment compared to the base metal.

关键词： Friction stir welding Localized corrosion Polarization Sensitization Super duplex stainless steel

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