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Distance Learning at the MS and PhD Levels in the Nuclear and Radiation engineering program, Nuclear and Applied Robotics, materials science and engineering and Walker Department of mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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Progress and prospects for all-perovskite tandem solar cells

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Journal of Energy Chemistry 2025年第4期103卷 90-96页

作者： Qingyang Wu Jingwei Zhu Dewei Zhao Department of Mechanical and Electrical Engineering Liaoning Provincial College of Communications College of Materials Science and Engineering and Engineering Research Center of Alternative Energy Materials and Devices Ministry of Education Sichuan University

All-perovskite tandem solar cells(TSCs) consist of a wide-bandgap(WBG,1.75-1.8 eV) top subcell and a low-bandgap(LBG,1.2-1.3 eV) bottom subcell,exhibit superior power conversion efficiencies(PCEs)compared to single-junction perovskite solar cells(PSCs).In addition,the advantages of lowtemperature solution preparation and low manufactu ring cost make the all-perovskite tandem solar cells widely concerned,and are considered to be one of the most potential next-generation high-performance thin film photovoltaic *** this perspective,we briefly summarize the state-of-the-art advances in monolithic all-perovskite TSCs focusing on the following aspects:LBG perovskite bottom subcells,WBG perovskite top subcells,and interconnecting layers(ICLs).We then discuss the primary strategies to improve their performa nce and finally highlight the perspective regarding the achievement of efficient and stable all-perovskite tandems.

关键词： Perovskite solar cells

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Investigation of a GER damper using the Cut submode for vibration suppression in rotor systems with transmission shafts

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science China Technological sciences 2025年第5期68卷 78-90页

作者： Xijun CAO Jinglei ZHAO Zhi SUN Huajun CAO Xiaoxu HUANG Jun LUO Huayan PU The State Key Laboratory of Mechanical Transmission for Advanced Equipments Chongqing University College of Mechanical and Vehicle Engineering Chongqing University College of Materials Science and Engineering Chongqing University School of Mechatronics Engineering and Automation Shanghai University

Electrorheological（ER） and magnetorheological（MR） dampers, which are active damping devices, stand out for their exceptional performance in mitigating vibrations in mechanical systems and construction engineering. Their prowess lies in the inherent ability of ER/MR fluids to change their mechanical properties, particularly viscosity and shear stress, in response to the influence of electric or magnetic fields. In this study, a damper filled with Giant-ER（GER） fluid, a modified product of ER fluid,is employed in the rotor system for vibration suppression. This damper operates in a Cut submode derived from the conventional working modes. This mode results in an effective enhancement of the damping performance by integrating the advantages of these modes, thereby achieving a damping force density of 1.2 × 10～4 N/m2and a modulation coefficient of 15 within a multilayered cylindrical damper. Whereafter, the dynamics of the rotor system are modeled and analyzed based on the Jeffcott rotor model, which incorporates a parallelogram-structured motion decoupling mechanism equipped with the proposed Cut submode dampers that are introduced to reduce the vibration of the transmission shaft in the rotor system. Furthermore, to evaluate the damping effect, a vibration-damping performance validation testbed is constructed. The results are noteworthy, demonstrating that by leveraging the superior properties of the GER fluid, the Cut submode damper effectively suppresses the vibrations of the transmission shaft, particularly at the resonant frequencies, achieving an impressive 88.9% reduction when subjected to an electric field of 3 kV/mm compared to the action of 0 kV/mm. This performance highlights the exceptional effectiveness of the proposed Cut submode, underscoring its vast potential for various engineering applications.

关键词： transmission shaft vibration suppression giant electrorheological fluid fluid damper Cut submode

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A critical review on oxidation behavior of Co-based superalloys

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Chinese Journal of Aeronautics 2025年第3期38卷 183-206页

作者： Chenghao PEI Qingshuang MA Qiuzhi GAO Yue YANG Yuhang DU Hailian ZHANG Huijun LI School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China School of Materials Science and Engineering Tianjin UniversityTianjin 300354China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW 2522Australia

The novel Co-based superalloys are extensively used in gas-powered and jet engine turbines due to their excellent high-temperature performance, achieved by strengthening the L12-γ′ ordered phase. This review presents an overview of the research progress on oxidation behavior of Co-based superalloys, including oxidation kinetics, oxides morphology, the formation and spallation of oxide layers, and importantly, the synergistic effects of alloying elements on oxidation resistance—a critical area considering the complex interactions with multiple alloying elements. Additionally, this review compares the oxidation resistance of single crystal versus polycrystalline alloys. The effect of phase interface and dislocations on oxidation behavior is also discussed. While significant progress has been achieved, areas necessitating further investigation include optimizing alloy compositions for enhanced oxidation resistance and understanding the long-term stability of oxide layers. The future prospects for Co-based superalloys are promising as ongoing research aims to address the existing challenges and unlock new applications at even higher operating temperatures.

关键词： Cobalt Superalloys Oxidation Alloying elements Microstructure Temperature

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Molecular Dynamics Simulations of Micromechanical Behaviours for AlCoCrFeNi_(2.1)High Entropy Alloy during Nanoindentation

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Acta Metallurgica Sinica(English Letters) 2025年第2期38卷 218-232页

作者： Ji-Peng Yang Hai-Feng Zhang Hong-Chao Ji Nan Jia College of Mechanical Engineering North China University of Science and TechnologyTangshan 063210China Key Laboratory of Materials Anisotropy and Texture of Ministry of Education School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

Eutectic high entropy alloys are noted for their excellent castability and comprehensive mechanical *** excellent mechanical properties are closely related to the activation and evolution of deformation mechanisms at the atomic *** this work,AlCoCrFeNi2.1 alloy is taken as the research *** mechanical behaviors and deformation mechanisms of the FCC and B2 single crystals with different orientations and the FCC/B2 composites with K-S orientation relationship during nanoindentation processes are systematically studied by molecular dynamics *** results show that the mechanical behaviors of FCC single crystals are significantly orientation-dependent,meanwhile,the indentation force of[110]single crystal is the lowest at the elastic-plastic transition point,and that for[100]single crystal is the lowest in plastic deformation *** with FCC,the stress for B2 single crystals at the elastic-plastic transition point is ***,more deformation systems such as stacking faults,twins and dislocation loops are activated in FCC single crystal during the plastic deformation process,resulting in higher indentation *** composites,the flow stress increases with the increase of B2 phase thickness during the initial stage of *** indenter penetrates heterogeneous interface,the significantly increased deformation system in FCC phase leads to a significant increase in indentation *** mechanical behaviors and deformation mechanisms depend on the component single *** the thickness of the component layer is less than 15 nm,the heterogeneous interfaces fail to prevent the dislocation slip and improve the indentation *** results will enrich the plastic deformation mechanisms of multi-principal eutectic alloys and provide guidance for the design of nanocrystalline metallic materials.

关键词： High entropy alloy mechanical behavior Plastic deformation mechanism Nanoindentation Molecular dynamics simulation

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Microstructure and mechanical properties of in-situ nano TiC reinforced Ni-based alloy composites prepared by spark plasma sintering

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材料科学技术（英文版） 2025年第3期206卷 100-112页

作者： Xuetong Zeng Haitao Liu Shasha Yang Chengtao Yu Minghui Chen Fuhui Wang School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Beijing Aerospace Technology Institute Beijing 10074China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Mechanical Engineering Ningxia Institute of Science and TechnologyShizuishan 753000China

Carbide dispersion reinforcing has been demonstrated to be an effective way of strengthening metal ma-trix ***,plagued by the nerve-wracking fact that the carbide particles tend to aggregate at the grain boundary of the metal matrix,grow up,and form an incoherent interface with it,their im-provement in mechanical strength tends to be *** this study,spark plasma sintering(SPS)was used to prepare the bulk alloy Ni20Cr and its composites with different carbides including TiC,SiC,and *** leads to discharge and elevates temperature at the interface to melt the Ni20Cr alloy par-ticles *** cooled down,the alloy is heterogeneously solidified on the surface of the carbide and builds up a coherent interface with *** to the decomposition of Ti3SiC2 during sintering,it completely transformed into nanosized TiC particles,which are engulfed by the outer melted layer of Ni20Cr and well dispersed within the alloy *** comparison to the Ni20Cr alloy,the composite with merely 4 wt％Ti3SiC2 gains over three times enhancement in yield strength to 879 MPa,while keeping a moderate high elongation of 17.8％.Finite element analysis demonstrated that the combination of SPS and precursor MAX phase of Ti3SiC2,which results in the in-situ precipitation of coherent ultrafine TiC particles in alloy grains,plays the key role in getting a good balance between mechanical strength and ductility for the Ni20Cr matrix composites.

关键词： Metal matrix composites Spark plasma sintering Interfaces mechanical properties

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High entropy pyrochlore(La0.3Gd0.3Ca0.4)2(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)2O7 ceramic with amorphous-like thermal conductivity for environmental/thermal barrier coating applications

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材料科学技术（英文版） 2025年第2期205卷 315-326页

作者： Zifan Zhao Ziyang Ruan Rong Li Shixiao Yan Xiaoliang Sun Chi Liu Di Zhang Bin Xu Zhiyi Ren Meng Wang Jianyu Li Jiang Tian Yehua Jiang Jing Feng Yanchun Zhou Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Shanghai Spaceflight Precision Machinery Institute Shanghai 201109China Shanghai Electro-Mechanical Engineering Institute Shanghai 201109China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Low thermal conductivity and excellent mechanical strength are essential to pyrochlore A2B2O7 ceramic for environmental/thermal barrier coating *** collaboratively tailor the me-chanical and thermal properties of A2B2O7 ceramic,a novel high entropy pyrochlore ceramic(La0.3Gd0.3Ca0.4)2(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)2O7 with significant atomic radius and mass fluctuation is pro-posed by simultaneously introducing various elements with different valence states at A and B cation *** as-synthesized(La0.3Gd0.3Ca0.4)2(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)2O7 exhibits enhanced fracture tough-ness(1.68 MPa m1/2),amorphous-like low thermal conductivity(1.45 W m-1 K-1 at 900 ℃)and matched thermal expansion coefficient(9.0 × 10-6 K-1 at 1200 ℃)with Al2O3/Al2O3 *** extensive mis-fits in atomic weight,ionic radius among the substitutional cations in combination with the intrinsic oxygen vacancies in the anion sublattice play significant roles in the thermal conductivity reduction of(La0.3Gd0.3Ca0.4)2(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)2O7 *** combination of outstanding mechanical and thermal properties indicates that this type of material has a good application prospect for environmen-tal/thermal barrier coatings.

关键词： High entropy ceramic Pyrochlore structure mechanical properties Thermal conductivity Phonon scattering

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Enhancing the Strength of Medium Mn Steel by Flash Treatment

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 139-150页

作者： Ye Liu Shuran Chu Hui Guo Mengyao Kong Chenxi Liu Jingwen Zhang Ran Ding Yongchang Liu State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science&EngineeringTianjin UniversityTianjin300350China School of Mechanical and Electrical Engineering Guangdong University of Science and TechnologyDongguan523083China

As a representative of the third generation advanced high-strength steels(AHSSs),medium Mn steels(MMS)have broad development prospects in the field of automobile *** with typical austenite reversion treatment have a soft duplex microstructure,***+austenite,presenting a high ductility but a low yield *** we show that a flash heating and cooling after austenite reversion treatment can replace the ferrite with strong martensite,which greatly enhances the yield strength of a 0.25C-4Mn steel by about 461–886 *** adjusting the reversion temperature before the flash treatment,the C and Mn concentrations of reverted austenite can be altered,which determine the fraction of reverted austenite surviving the flash *** addition,the mechanical stability of final retained austenite is also linked to the reversion temperature,resulting different work hardening behaviors due to transformation induced plasticity(TRIP)*** tweaking the reversion temperature before the flash treatment,an optimized combination of strength and ductility can be *** micromechanical differences caused by the replacement of the matrix are also investigated via in-situ digital image correlation method.

关键词： Medium Mn steel Retained austenite Flash treatment Transformation induced plasticity(TRIP)effect mechanical properties

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Studying the Impact of T4 and T6 Heat Treatments on Corrosion and mechanical Properties of 6082-Al Alloy Treated with Al-5Ti-1B Grain Refiner

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Journal of Bio- and Tribo-Corrosion 2025年第1期11卷 1-13页

作者： Abd El-Aziz, Kh. Saber, D. Materials Engineering Department Faculty of Engineering Zagazig University Zagazig44519 Egypt Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia Industrial Engineering Program Mechanical Engineering Department College of Engineering Taif University Taif Saudi Arabia

The mechanical and corrosion characteristics of aluminum alloys can be influenced not only by the addition of grain refiners but also by heat treatment that modifies the microstructure and introduces variations in these characteristics. The purpose of this work was to examine how the mechanical properties and corrosion resistance of 6082-Al alloy with Al-5Ti-1B grain refiner are affected by both artificial and natural aging heat treatments. By using the permanent mold casting process, the required specimens of the investigated alloys were produced. A VHS-1000 microhardness testing apparatus is used to measure microhardness at a 100 g load. A sliding wear test is carried out using a pin-on-disk apparatus. Potentiodynamic polarization curves in a 3.5 weight percent NaCl solution are used to assess the corrosion behavior of every specimen. The current results revealed that the mechanical properties improved markedly with the additions of Al–5Ti-1B grain refiner to the investigated alloy, this is maybe due to the microstructure changes as a result of grain refiner additions. Although the addition of Al-5Ti-1B grain refiner to 6082-Al alloy improved the hardness and wear resistance, it showed a negative influence on the corrosion resistance of these alloys. The results also demonstrated that, when compared to as-cast condition, artificial heat treatment of 6082-Al alloy inoculated by Al-5Ti-1B grain refiner improved their hardness, wear resistance, and corrosion properties significantly. Furthermore, compared to natural aging heat treatment, artificial aging heat treatment demonstrated a noticeably improved level of hardness, wear, and corrosion behavior. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Aluminum corrosion

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Low-cost chemical surface smoothing of CO2 laser-etched acrylic using WELD ON 4 acrylic solvent cement

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International Journal of Advanced Manufacturing Technology 2025年第5期138卷 2245-2255页

作者： Moncada, Luis H. Safaripour, Samira Hutter, Tanya Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

With the increasing use of micro-manufactured devices and the demand for low-cost fabrication techniques, this study presents a simple and scalable surface polishing method for laser etched acrylic using WELD-ON 4 acrylic solvent cement, a solvent typically used for bonding thermoplastics. The method’s effectiveness was evaluated by treating acrylic samples up to three times and analyzing changes in transparency, surface roughness average (Ra), luminescence, and wettability. Results show that even a single treatment significantly improved surface smoothness, reduced light scattering, and brought contact angle and optical clarity closer to those of unetched acrylic. After three treatments, the surface became isotropic, with laser-etched lines disappearing. Specifically, a 60% reduction in Ra was observed in the direction perpendicular to the etched lines, while the parallel direction initially showed a similar trend, followed by a slight increase attributed to the formation of surface irregularities caused by the re-solidification of dissolved acrylic. Contact angle measurements indicated that the surface remained hydrophilic, with controllable wettability based on the number of treatments. Overall, this method provides a low-cost, cleanroom-free solution for improving the surface finish of laser-fabricated acrylic components. Its compatibility with complex or recessed geometries makes it particularly suitable for microfluidic devices and other precision applications requiring both optical clarity and controlled surface properties. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Carbon dioxide lasers

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