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Elucidating the process mechanism in Mg-to-Al friction stir lap welding enhanced by ultrasonic vibration

Journal of Magnesium and Alloys 2025年第1期13卷 338-355页

作者： Ming Zhai Lei Shi ChuanSong Wu MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan 250061 China

The composite structures/components made by friction stir lap welding(FSLW)of Mg alloy sheet and Al alloy sheet are of wide application potentials in the manufacturing sector of transportation *** further improve the joint quality,the ultrasonic vibration(UV)is exerted in FSLW,and the UV enhanced FSLW(UVeFSLW)was developed for making Mg-to-Al dissimilar *** numerical analysis and experimental investigation were combined to study the process mechanism in Mg/Al *** equation related to the temperature and strain rate was derived to calculate the grain size at different locations of the weld nugget zone,and the effect of grain size distribution on the threshold thermal stress was included,so that the prediction accuracy of flow stress was further *** such modified constitutive equation,the numerical simulation was conducted to compare the heat generation,temperature profiles and material flow behaviors in Mg/Al UVeFSLW/FSLW *** was found that the exerted UV decreased the temperature at two checking points on the tool/workpiece interface from 707/671 K in FSLW to 689/660 K in UVeFSLW,which suppressed the IMCs thickness at Mg-Al interface from 1.7μm in FSLW to 1.1μm in *** exerted UV increased the horizontal materials flow ability,and decreased the upward flow ability,which resulted in the increase of effective sheet thickness/effective lap width from 2.01/3.70 mm in FSLW to 2.04/4.84 mm in ***,the ultrasonic vibration improved the tensile shear strength of Mg-to-Al lap joints by 18%.

关键词： Friction stir lap welding Mg-to-Al dissimilar alloys Ultrasonic vibration Numerical simulation Experimental investigation

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Nanoscale analysis of interfacial structure and its effects on mechanical properties of Mg/Al laminate reinforced by TiB_(2) particles

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Journal of Magnesium and Alloys 2025年第3期13卷 1310-1324页

作者： Lihua Qian Liang Chen Biaohua Que Kaiqiang Shen Guoqun Zhao Cunsheng Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061PR China

Fabricating Mg/Al laminate is an effective strategy to circumvent the inherently low formability and poor corrosion resistance of Mg ***,Mg/Al laminate with good bonding quality and mechanical properties was successfully fabricated via porthole die co-extrusion process using ZK60 Mg and TiB2/6061Al composite as constituted *** the results from microstructural characterization and mechanical testing,the effects of extrusion temperature on microstructure,interfacial structure,element diffusion,and mechanical properties were *** results show that Mg/Al laminate achieves a sound welding quality by mechanical bonding and diffusion *** obvious intermetallic compounds(βandγ)layer forms at Mg/Al interface,and its thickness increases to 8.3μm as the extrusion temperature reaches 400°*** extrusion temperature promotes the dynamic recrystallization and grain growth of Mg and Al layers,while the dislocation density decreases.β/γinterface shows a coherent feature,whileγ/Mg interface is semi-coherent with a locally ordered transition zone of 4.5 *** rich Mg and Cr layers are found at TiB2/6061 interface,which is conducive to improving the bonding *** the extrusion temperature is 370°C,the thickness of diffusion layer is around 5.0μm,and the bonding strength reaches 18.68 MPa,resulting in the best comprehensive mechanical *** work provides a new direction for the development of Mg/Al laminate with excellent strength and ductility.

关键词： Mg/Al Extrusion Microstructure Interface Dislocation density

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Achieving further refinement of grain structure and improvement of mechanical properties in Al-12Si-4Cu-2Ni-1Mg alloy by Al-Ti-C-B master alloy addition and deep cryogenic treatment

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China Foundry 2025年第1期22卷 75-82页

作者： Lin-fei Xia Wen-bo Li Zuo-shan Wei Yu-ying Wu Xiang-fa Liu China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou Institute of TechnologyBinzhou 256600ShandongChina

Near-eutectic Al-Si alloys are widely used in automotive manufacturing due to their superior wear resistance and high temperature *** of high Si content,the grain refinement of near-eutectic Al-Si alloy has been a problem for many *** this study,the effect of deep cryogenic treatment(DCT)on the microstructure and mechanical properties of Al-12Si-4Cu-2Ni-Mg alloy with addition of Al-Ti-C-B master alloy was fully *** show that the average grain size of the alloy is greatly reduced from 0.92 mm to 0.50 mm,and the eutectic Si and Al7Cu4Ni precipitates are spheroidized and refined in Al-12Si-4Cu-2Ni-Mg after DCT for 24 h and aging *** these changes of microstructures result in a significant increment of about 22.5%in elongation and a slight enhancement of about 6.8%in tensile ***,the refinement of microstructure also significantly improves the fatigue life of the alloy.

关键词： deep cryogenic treatment near-eutectic Al-Si master alloy microstructure mechanical properties

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Stabilizing water and regulating interfacial electrostatic interaction with economical supporting salt for stable Zn metal anode

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Journal of Energy Chemistry 2025年第2期101卷 429-436,I0009页

作者： Yiqun Du Rongkai Kang Boya Zhang Han Wang Jianxin Zhang School of Material Science&Engineering University of JinanJinan 250022ShandongChina Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina

Developing rechargeable aqueous Zn batteries for large-scale energy storage is impeded by inadequate reversibility and stability of the Zn anode,primarily caused by parasitic reactions and heterogeneous *** study proposes an economical electrolyte strategy to address these Zn-related *** addition of a supporting salt enhances the thermodynamic stability of water,reduces the number of highly reactive water molecules,and modulates the interfacial electrostatic *** approach effectively suppresses hydrogen evolution reaction and uncontrolled ***,the rationally proportioned electrolyte allows a high average Coulombic efficiency of 99.93%for 1000 cycles in a Zn‖Cu battery and a prolonged lifespan exceeding 4800 h in Zn‖Zn *** knock-on effect is that Zn‖MnO_(2)pouch cells deliver stable cycling performance,demonstrating the viability of this approach for practical applications.

关键词： Zn anode Aqueous electrolyte Sodium citrate Solvation structure Hydrogen bond

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Molecular Dynamics Study on the Interactions of 1/2Edge Dislocations with Voids and Ni_(3)Al Precipitates in FCC Ni

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Acta Mechanica solida Sinica 2025年第1期38卷 1-13页

作者： Wendong Cui Junfeng Nie Pandong Lin Lei He Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing100084China Ministry of Education Key Laboratory for Liquid-Solid Structural Evolution and Processing of MaterialsSchool of Materials Science and EngineeringShandong UniversityJinan250061China

Nickel-based alloys are the primary structural materials in steam generators of high-temperature gas *** understand the irradiation effect of nickel-based alloys,it is necessary to examine dislocation movement and its interaction with irradiation defects at the *** due to voids and Ni_(3)Al precipitates may significantly impact irradiation damage in nickel-based *** paper employs the molecular dynamics method to analyze the interaction between edge dislocations and irradiation defects(void and Ni_(3)Al precipitates)in face-centered cubic *** effects of temperature and defect size on the interaction are also *** results show that the interaction process of the edge dislocation and irradiation defects can be divided into four stages:dislocation free slip,dislocation attracted,dislocation pinned,and dislocation *** modes include the formation of stair-rod dislocations and the climbing of extended dislocation bundles for voids,as well as the generation of stair-rod dislocation and dislocation shear for ***,the interactions of edge dislocations with voids and Ni_(3)Al precipitates are strongly influenced by temperature and defect size.

关键词： Void Ni_(3)Al precipitate Nickel Edge dislocation Molecular dynamics

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Multifunctional Janus-structured Polytetrafluoroethylene-Carbon Nanotube-Fe_(3)O_(4)/MXene Membranes for Enhanced EMI Shielding and Thermal Management

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Nano-Micro Letters 2025年第6期17卷 242-263页

作者： Runze Shao Guilong Wang Jialong Chai Jun Lin Guoqun Zhao Zhihui Zeng Guizhen Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061People’s Republic of China Center for Advanced Studies in Precision Instruments Hainan UniversityHaikou 570228People’s Republic of China

Herein,a novel Janus-structured multifunctional membrane with integrated electromagnetic interference(EMI)shielding and personalized thermal management is fabricated using shear-induced in situ fibrillation and vacuum-assisted ***,within the polytetrafluoroethylene(PTFE)-carbon nanotube(CNT)-Fe_(3)O_(4)layer(FCFe),CNT nanofibers interweave with PTFE fibers to form a stable“silk-like”structure that effectively captures Fe_(3)O_(4)*** incorporating a highly conductive MXene layer,the FCFe/MXene(FCFe/M)membrane exhibits excellent electrical/thermal conductivity,mechanical properties,and flame ***,benefiting from the rational regulation of component proportions and the design of a Janus structure,the FCFe/M membrane with a thickness of only 84.9μm delivers outstanding EMI shielding effectiveness of 44.56 dB in the X-band,with a normalized specific SE reaching 10,421.3 dB cm^(2)g^(-1),which is attributed to the“absorption-reflection-reabsorption”***,the membrane demonstrates low-voltage-driven Joule heating and fast-response photothermal *** the stimulation of a 3 V voltage and an optical power density of 320 mW cm^(-2),the surface temperatures of the FCFe/M membranes can reach up to 140.4 and 145.7℃,*** brief,the FCFe/M membrane with anti-electromagnetic radiation and temperature regulation is an attractive candidate for the next generation of wearable electronics,EMI compatibility,visual heating,thermotherapy,and military and aerospace applications.

关键词： MXene Polytetrafluoroethylene Fe_(3)O_(4) Janus-structured EMI shielding Thermal management Multifunctional

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Achieving a large field-induced polarization and energy density in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer technique

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Journal of Advanced Ceramics 2025年第3期14卷 69-78页

作者： Chao Liu Jun Ouyang Yuyao Zhao Hanfei Zhu Hongbu Cheng Zhenyan Liang Li Wang Institute of Advanced Energy Materials and Chemistry Jinan Engineering Laboratory for Multi-scale Functional MaterialsShandong Provincial Key Laboratory of Molecular EngineeringSchool of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China Key Laboratory for Liquid–Solid Structure Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China

Ferroelectric oxide films with a large field-induced polarization can be used in dielectric capacitors for charge or energy storage in microelectronic systems and hence have attracted intense research interest.A high processing temperature is usually required to produce a well-crystallized polar phase and hence a large polarization in the film,corresponding to a high charge or energy ***,high processing temperature not only reduces the charge‒discharge efficiency by producing a sizable remnant polarization but is also incompatible with the integration *** this study,we address this problem by creating a large field-induced polarization(~55.8μC/cm^(2))in BaTiO_(3)films sputter-deposited on Si at 200℃ via a buffer-layer *** large polarization led to a high energy density and efficiency(Wrec≈94.7 J/cm^(3),η≈78.2%@4 MV/cm).The thickness of LaNiO_(3)buffer layer was revealed to be the key factor determining the electric polarization(remnant and field-induced ones).A 50 nm LaNiO_(3)thickness,corresponding to the aforementioned polarization and energy storage performance,not only ensures proper crystallization in the BaTiO_(3)film,but also leads to an optimal combination of polycrystalline grains with a high dielectric *** latter accounts for the majority of the field-induced *** results revealed the key role of a buffer layer in tuning the microstructure of a low-temperature deposited ferroelectric oxide ***,the excellent charge/energy storage performance of these 200℃-deposited BaTiO_(3)films has provided many opportunities for this simple dielectric in microelectronics.

关键词： ferroelectric oxide films field-induced polarization BaTiO_(3) LaNiO3 energy density

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Near-perfect replication on amorphous alloys through active force modulation based on machine learning/neural network parameter prediction

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 177-187页

作者： Senkuan Meng Zheng Wang Ruisong Zhu Ruijie Liu Jiang Ma Lina Hu Weihua Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

As a microforming technique,micro/nano-structural replication possesses advantages of high precision and *** the remarkable superplasticity in the supercooled liquid region,amorphous alloys or metallic glasses(MGs)are regarded as ideal materials for miniature ***,due to the intrinsic metastable nature of supercooled liquids,the design of imprinting processes for MGs poses a *** the past,process parameters have largely relied on trial-and-error *** this work,a low-frequency active force modulation system is employed to apply a stable,precise,and real-time feedback stress field for imprinting of MG ***-frequency vibrations can facilitate the filling of microstructures on the template surface by reducing the effective viscosity of the supercooled *** the dataset composed of orthogonal experiments,a machine learning strategy based on back-propagation(BP)neural networks was utilized to construct a 3D parameter space for temperature,stress,and time,and to predict the corresponding filling ***,the optimal combination of imprinting process parameters was identified,and its filling ratio was experimentally validated to reach as high as *** near-perfect replication of microstructures confirms the superiority of the active force modulation system and the data-driven strategy of machine learning-assisted parameter *** the same time,this one-step microforming process provides a new approach to addressing the accuracy-cost trade-off dilemma in precision manufacturing.

关键词： metallic glass amorphous alloy microforming imprinting machine learning

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稀有金属材料与工程 2025年第2期54卷 311-318页

作者： Zhang Wenxin Zhang Xiankun Shi Lei Li Shengli Jiang Yuanning Wu Chuansong State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong UniversityJinan 250061China Key Laboratory for Liquid-Solid Structure Evolution&Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the *** show that under different welding parameters,with the decrease in welding heat input,the weld surface is *** Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal *** to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of *** the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget *** the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.

关键词： Ti/Al dissimilar welding friction stir lap welding Ti alloy Al-Li alloy interface bonding mechanical property

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Low-frequency metamaterial antenna based on magnetic field coupling effect

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Science China(Technological Sciences) 2025年第4期68卷 82-93页

作者： Zilun ZENG Jingqi WU Chenxi ZHANG Liwei WANG Zidong ZHANG Yunsheng GUO Jianchun XU Ke BI State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing100876China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan250061China School of Electronic Information Engineering Inner Mongolia UniversityHohhot010021China

Low-frequency(LF)electromagnetic waves have high penetration and low attenuation characteristics in media,making them essential for cross-media *** LF communication systems,the loop antenna commonly functions as a receiver for detecting weak ***,traditional LF loop antennas typically require large structures to achieve high radiation efficiency,which poses challenges for portability and long-distance ***,a magnetic resonant coupling metamaterial(MRCM)antenna with high radiation capacity,frequency tunability,direction adjustability,and compact form is *** elucidate its radiation mechanism and frequency modulation capabilities,the equivalent circuit model and electromagnetic simulations are carried *** with conventional loop antennas,the MRCM antennas can realize the radiation magnetic flux density seven times and extend the effective magnetic transmission distance by three ***,the MRCM antennas allow for adjustable radiation direction and operating frequency,enhancing its versatility in different application *** metamaterial antenna design allows a pocket-sized antenna to achieve an effective communication range of 180 m,presenting a promising solution for improving communication capabilities in changing environments such as underwater and underground settings.

关键词： low frequency communication metamaterial magnetic resonant coupling wireless communication

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