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Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2024

作者： Kapan, Enver Alkan, Sertan Can Aydıner, C. Mason, Jeremy K. Department of Mechanical Engineering Boğaziçi University Istanbul34342 Turkey Department of Materials Science and Engineering University of California Davis 1 Shields Avenue DavisCA95616 United States

ISBN: (纸本)9783031502392

Molecular dynamicsMolecular Dynamics simulations are performed that follow the evolution of a tension twin embryo nucleating from an asymmetrically tilted grain boundary to investigate the energetics of twin nucleationNucleation. The line, surface, and volumetric terms associated with twin nucleation are identified. A micromechanical model is proposed where the stress field around the twin nucleus is estimated using the Eshelby formalism, and the contributions of the various twin-related structures to the potential energy of the twin are evaluated. The reduction in the grain boundary energy arising from the change in character of the prior grain boundary is found to offset the energy costs of the other interfaces. The defect structures bounding the stacking faults that form inside the twin are also found to possibly have significant energetic contributions. These results suggest that both of these effects could be more significant than has been assumed by many earlier continuum-scale twin nucleation models and are perhaps critical considerations when predicting twin nucleationNucleation sites in magnesiumMagnesium. © The Minerals, Metals & materials Society 2024.

关键词： Nucleation

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Dislocation behavior in a polycrystalline Mg-Y alloy using multi-scale characterization and VPSC simulation

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Journal of materials science & Technology 2022年第3期98卷 87-98页

作者： Bijin Zhou Leyun Wang Jinhui Wang Alireza Maldar Gaoming Zhu Hailong Jia Peipeng Jin Xiaoqin Zeng Yanjun Li National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway School of Mechanical Engineering Qinghai UniversityXining 810016China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

In this study,the dislocation behavior of a polycrystalline Mg-5Y alloy during tensile deformation was quantitatively studied by an in-situ tensile test,visco-plastic self-consistent(VPSC)modeling,and transmission electron microscopy(TEM).The results of the in-situ tensile test show thatdislocations contribute to most of the deformation,while a small fraction ofdislocations are also activated near grain boundaries(GBs).The critical resolved shear stresses(CRSSs)of different dislocation slip systems were *** CRSS ratio between prismatic and basal dislocation slip in the Mg-Y alloy(~13)is lower than that of pure Mg(~80),which is considered as a major reason for the high ductility of the *** study shows that thedislocations in the alloy have high mobility,which also helps to accommodate the deformation near GBs.

关键词： Mg-Y alloy Dislocation behavior Deformation mechanisms Critical resolved shear stress

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21-Component compositionally complex ceramics: Discovery of ultrahigh-entropy weberite and fergusonite phases and a pyrochlore–weberite transition

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Journal of Advanced Ceramics 2022年第4期11卷 641-655页

作者： Mingde QIN Heidy VEGA Dawei ZHANG Sarath ADAPA Andrew J.WRIGHT Renkun CHEN Jian LUO Department of Nano Engineering University of California San DiegoLa Jolla 92093USA Department of Chemistry and Biochemistry University of California San DiegoLa Jolla 92093USA Program of Materials Science and Engineering University of California San DiegoLa Jolla 92093USA Department of Mechanical and Aerospace Engineering University of California San DiegoLa Jolla 92093USA

Two new high-entropy ceramics(HECs)in the weberite and fergusonite structures,along with the unexpected formation of ordered pyrochlore phases with ultrahigh-entropy compositions and an abrupt pyrochlore–weberite transition,are discovered in a 21-component oxide *** the Gibbs phase rule allows 21 equilibrium phases,9 out of the 13 compositions examined possess single HEC phases(with ultrahigh ideal configurational entropies:~2.7kB per cation or higher on one sublattice in most cases).Notably,(15RE_(1/15))(Nb_(1/2)Ta_(1/2))O_(4) possess a single monoclinic fergusonite(C2/c)phase,and(15RE_(1/15))_(3)(Nb_(1/2)Ta_(1/2))_(1)O_(7) form a single orthorhombic(C222_(1))weberite phase,where 15RE_(1/15) represents Sc_(1/15)Y_(1/15)La_(1/15)Pr_(1/15)Nd_(1/15)Sm_(1/15)Eu_(1/15)Gd_(1/15)Tb_(1/15)Dy_(1/15)Ho_(1/15)Er_(1/15)Tm_(1/15) Yb_(1/15)Lu_(1/15).Moreover,a series of eight(15RE_(1/15))_(2+x)(Ti_(1/4)Zr_(1/4)Ce_(1/4)Hf_(1/4))_(2−2x)(Nb_(1/2)Ta_(1/2))_(x)O_(7) specimens all exhibit single phases,where a pyrochlore–weberite transition occurs within 0.75

关键词： compositionally complex ceramics high-entropy ceramics(HECs) weberite pyrochlore fergusonite ultrahigh-entropy ceramics many-component ceramics

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Advancing Al-doped ZnO thin films structural,optical and electrical properties of low temperature PET substrates via flash lamp annealing

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Journal of Semiconductors 2024年第12期45卷 47-60页

作者： Juwon Lee Chang-Hyeon Jo Gwangseop Lee Min-Sung Bae Slawomir Prucnal Shengqiang Zhou Muhammad Zubair Khan Osama Gohar Mohsin Saleem Jung-Hyuk Koh Graduate School of Intelligent Energy and Industry Chung-Ang UniversityHeukseok-roSeoulRepublic of Korea School of Electrical and Electronic Engineering Chung-Ang UniversitySeoulRepublic of Korea Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials ResearchBautzner Landstraße 40001328DresdenGermany Department of Materials Science and Engineering Pak-Austria Fachhochschule:Institute of Applied Sciences and TechnologyMangHaripur22621Khyber PakhtunkhwaPakistan Department of Mechanical and Electrical Systems Engineering Graduate School of EngineeringKyoto University of Advanced ScienceGotanda-choYamanouchiUkyo-kuKyoto 615-8577Japan School of Chemical and Materials Engineering(SCME) National University of Sciences&Technology(NUST)H-12Islamabad 44000Pakistan

In this study, aluminum-doped zinc oxide(AZO) thin films were deposited onto a low-temperature polyethylene terephthalate(PET) substrate using DC magnetron sputtering. Deposition parameters included power range of 100-300 W, a working pressure of 15 mTorr, and a substrate temperature of 50 ℃. Post-deposition, flash lamp annealing(FLA) was employed as a rapid thermal processing method with a pulse duration of 1.7 ms and energy density of 7 J·cm-2, aimed at enhancing the film's quality while preserving the temperature-sensitive PET substrate. FLA offers advantages over conventional annealing,including shorter processing times and improved material properties. The structural, optical, and electrical characteristics of the AZO films were assessed using X-ray diffraction, field emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, ultraviolet-visible spectroscopy, and Hall effect measurements. The results demonstrated that properties of AZO films varied with deposition and annealing conditions. Films deposited at 200 W and subjected to FLA exhibited superior crystallinity, with average visible light transmittance exceeding 80% and resistivity as low as 0.38 Ω·cm representing 95%improvement in transmittance. Electrical analysis revealed that carrier concentration, mobility, and resistivity were influenced by both sputtering and annealing parameters. These findings underscore the effectiveness of FLA in optimizing AZO thin film properties, highlighting potential in optoelectronics applications.

关键词： flash lamp annealing AZO thin film PET sputtering

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Strategies for Improving the Comparison of Frequency Response Functions with Similarity Metrics 41st

Strategies for Improving the Comparison of Frequency Respons...

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41st IMAC, A Conference and Exposition on Structural Dynamics, 2023

作者： Kramer, Hunter R. Manring, Levi H. Schultze, John F. Zimmerman, Sandra J. Mann, Brian P. Department of Mechanical Engineering and Materials Science Pratt School of Engineering Duke University DurhamNC United States Los Alamos National Laboratory Los AlamosNM United States

ISBN: (纸本)9783031369988

Determining the similarity of an existing structure with a reference structure is an important problem in structural dynamics. For this purpose, many metrics have been developed to quantify the similarity of frequency spectra, such as two transfer functions. However, these approaches yield an aggregate or single numerical score for the similarity over an entire frequency range. This paper, instead, applies these common similarity metrics across a range of frequencies and plots the results to illustrate instances where counterintuitive results can occur. For example, the highest degree of similarity often occurs at a frequency where the two frequency spectra appear to diverge. The result is that counterintuitive cases can be corrected by applying a log frequency shift to the response, enabling better comparisons. Additionally, a similarity metric that compares the phase of the frequency spectra can be applied to make further comparisons. This paper seeks to verify the new methods presented in Manring et al. (J Sound Vib 539:117255, 2022) using a modified experiment and proposes a windowing method as another tool for comparing similar transfer functions. The authors investigate these approaches while applying historical measures of similarity, to provide a more intuitive result for a similarity score. While the shifted frequency spectra can now provide more intuitive comparisons of the degree of similarity, the degree of shifting the frequency segments provides an additional opportunity to quantify the differences in the frequency spectra. The developed approaches were applied to both theoretical and experimental systems. © 2024, The Society for Experimental Mechanics, Inc.

关键词： Frequency response

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A Soft-Robotic Thumb Orthosis Facilitating Individual Assistance of Thumb Joints

A Soft-Robotic Thumb Orthosis Facilitating Individual Assist...

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IEEE International Conference on Soft Robotics (RoboSoft)

作者： Christina Chase-Markopoulou Anoush Sepehri Tania K. Morimoto Michael T. Tolley Department of Mechanical and Aerospace Engineering Department of Surgery Materials Science and Engineering Program University of California San Diego CA USA

ISBN: (数字)9798331520205

ISBN: (纸本)9798331520212

Many wearable soft robotic devices have been developed to assist with spasticity – the increased muscle tone seen in individuals with neurological conditions such as stroke or cerebral palsy. However, these devices typically lack the ability to individually assist multiple degrees of freedom (DOF), which is essential to performing a broad range of daily tasks. To address this need, we developed a soft robotic thumb orthosis to achieve movement in three DOF. We focused on the thumb as it performs the most complex movement. Our orthosis used three unfolding textile pneumatic actuators to assist with the extension of the interphalangeal joint, combined extension of the metacarpal and carpometacarpal joints, and abduction of the carpometacarpal joint. The orthosis was tested on both a 3D-printed biomimetic test bed that emulated spasticity and a healthy individual. The orthosis met the full range of motion targets for each joint, except for the abduction of the carpometacarpal joint with medium spasticity, and surpassed the range of motion threshold required for activities of daily living. The orthosis was able to: (1) assist each DOF independently, (2) move the tip of a biomimetic thumb to a pre-determined target with total error of less than 1.5 cm when actuated with open-loop control, and, (3) provide individual joint assistance to a user with no motor impairment. This research showcases the ability of a soft robotic orthosis to assist movement in simulated spasticity of individual thumb joints and provides an important step towards a platform to study whether independent joint assistance during rehabilitation improves patient outcomes.

关键词： Performance evaluation Pneumatic actuators Biomimetics Thumb Spasticity Soft robotics Muscles Motors Motion control Textiles

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Effect of Hot Rolling on Bainite Phase Transformation in High-Strength, Low-Alloy Steel 3

Effect of Hot Rolling on Bainite Phase Transformation in Hig...

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3rd International Symposium on the Recent Developments in Plate Steels

作者： Saha, Barshan Haffner, Henry Buchely, Mario Lekakh, Simon Chandrashekhara, K. O’Malley, R. Peaslee Steel Manufacturing Research Center Department of Materials Science and Engineering Missouri University of Science and Technology RollaMO65409 United States Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology RollaMO65409 United States

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Transport and magnetic properties of Hund's metal CaRuO3 under strain modulation

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Physical Review B 2024年第4期110卷 L041403-L041403页

作者： Zhen Wang Arjyama Bordoloi Zhaoqing Ding Enling Wang Xiaofeng Wu Zeguo Lin Mingyu Yang Chenxu Liu Jinglin Zhou Meng Meng Fang Yang Qinghua Zhang Xiaoran Liu Sobhit Singh Huan-hua Wang Jiandong Guo Beijing National Laboratory for Condensed Matter Physics and School of Nuclear Science and Technology Department of Mechanical Engineering School of Physical Sciences Materials Science Program

We synthesized CaRuO3 (001) thin films on a set of substrates and investigated their electronic and magnetic properties via combining magnetotransport measurements with first-principles density-functional theory calculations. The experimental results indicate that a moderate strain can introduce the Kondo effect in the system, leading to a significant modulation of the non-Fermi liquid behavior. Moreover, when the strain reaches a certain threshold, the system undergoes a metal-semiconductor transition, accompanied by a transition from a nonmagnetic state to a plausible G-type antiferromagnetic state. We attribute the observed phenomena in CaRuO3 to strain-induced disruption of the delicate balance between the itinerant and the local Ru 4d electrons. These findings shed light on the intriguing magnetic and non-Fermi liquid behavior of CaRuO3, systematically tailored by heteroepitaxial strain.

关键词： Density of states Kondo effect Transport phenomena Ruthenates Ultrathin films Density functional calculations Physical deposition Resistivity measurements Strain engineering X-ray diffraction X-ray reflectivity

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Bioinspired polysaccharide-based nanocomposite membranes with robust wet mechanical properties for guided bone regeneration

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National science Review 2024年第3期11卷 215-226页

作者： Jian-Hong Xiao Zhen-Bang Zhang JiaHao Li Si-Ming Chen Huai-Ling Gao YinXiu Liao Lu Chen ZiShuo Wang YiFan Lu YuanZhen Hou HengAn Wu DuoHong Zou Shu-Hong Yu Department of Chemistry New Cornerstone Science Laboratory Institute of Biomimetic Materials&Chemistry Anhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Department of Dental Implant Center Stomatologic Hospital and College Key Laboratory of Oral Diseases Research of Anhui Province Anhui Medical University CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Department of Oral Surgery College of Stomatology National Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology Shanghai Research Institute of Stomatology Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Institute of Innovative Materials(I2M) Department of Chemistry Department of Materials Science and Engineering Southern University of Science and Technology

Polysaccharide-based membranes with excellent mechanical properties are highly desired. However, severe mechanical deterioration under wet conditions limits their biomedical applications. Here, inspired by the structural heterogeneity of strong yet hydrated biological materials, we propose a strategy based on heterogeneous crosslink-and-hydration（HCH） of a molecule/nano dual-scale network to fabricate polysaccharide-based nanocomposites with robust wet mechanical properties. The heterogeneity lies in that the crosslink-and-hydration occurs in the molecule-network while the stress-bearing nanofiber-network remains unaffected. As one demonstration, a membrane assembled by bacterial cellulose nanofiber-network and Ca2+-crosslinked and hydrated sodium alginate molecule-network is designed. Studies show that the crosslinked-and-hydrated molecule-network restricts water invasion and boosts stress transfer of the nanofiber-network by serving as interfibrous bridge. Overall, the molecule-network makes the membrane hydrated and flexible; the nanofiber-network as stress-bearing component provides strength and *** HCH dual-scale network featuring a cooperative effect stimulates the design of advanced biomaterials applied under wet conditions such as guided bone regeneration membranes.

关键词： bioinspiration heterogeneous crosslink-and-hydration dual-scale network nanocomposite membrane wet mechanical properties guided bone regeneration

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Exploring the Correlation Between Surface Roughness, Surface Energy, Nano-indentation, Electrical Properties, and Magnetic Characteristics of Annealed Co40Fe40Dy20 Thin Films Deposited on Si(100) Substrates

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Journal of Electronic materials 2024年第8期53卷 4498-4511页

作者： Liu, Wen-Jen Chang, Yung-Huang Hsu, Shuo-Ting Fern, Chi-Lon Chen, Yuan-Tsung Tsao, Shin-Ying Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

The impact of film thickness and annealing temperature on the structural, electrical, magnetic, and mechanical properties of cobalt–iron–dysprosium (Co40Fe40Dy20 ) thin films deposited on Si(100) substrates have been investigated. X-ray diffraction (XRD) analysis confirmed the film's crystalline microstructure, featuring dysprosium oxide, Dy2O3(440), and cobalt oxide, Co2O3(422) and Co2O3(511), crystallographic phases. Surface energy measurements indicated a noticeable reduction in surface energy following annealing treatments, which could be ascribed to the alleviation of residual stress and enhanced atomic arrangement, resulting in a more stable film structure with reduced surface energy. The film exhibited a decreasing trend in hardness with increasing thickness, and film resistivity was significantly responsive to alterations in thickness and annealing temperature. Notably, the Co40Fe40Dy20 film demonstrated exceptional characteristics, featuring a high saturation magnetization (Ms) of 675 emu/cm3 and a low coercivity (Hc) of 9.5 Oe. Further analysis of magnetic domains and hysteresis loops revealed that larger and brighter domains were associated with higher Hc. To sum up, the surface roughness of CoFeDy films under various annealing temperatures played a pivotal role in shaping their magnetic, electrical, adhesive, and optical characteristics. An improved low-frequency alternating current magnetic susceptibility (χac) value was achieved by minimizing the pinning effect on domain walls through surface smoothing. Moreover, smoother surfaces displayed heightened carrier conductivity, resulting in a decrease in electrical resistance. On the whole, Co40Fe40Dy20 films exhibited outstanding soft magnetic properties, encompassing high saturation magnetization, low coercivity, exceptional mechanical attributes, and decreased surface energy. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Magnetic susceptibility

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