Article
Materials Science, Multidisciplinary
Guanlan Zhang, Jinqiang Gao, Chuansong Wu
Summary: This paper investigates the numerical prediction and understanding of ultrasonic vibration-assisted friction stir welding (UVaFSW) of dissimilar Al/Mg alloys. By redefining the calculation method of acoustic stress work and developing a modified acoustic-plastic constitutive equation, the quantitative analysis of the acoustic effects on heat generation, material flow, and intermixing in the welding process is conducted. The results show that the ultrasonic vibration has a minor effect on the total heat, but promotes material flow and intermixing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Wenzhen Zhao, ChuanSong Wu, Lei Shi
Summary: The study demonstrates that ultrasonic vibration can effectively reduce interfacial friction stress, improve welding quality, and the model's validity is confirmed through experimental validation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Civil
Xue Wang, Xiankun Zhang, Lei Shi, Chuansong Wu, Gaoqiang Chen
Summary: Ultrasonic vibration enhances heat transfer and plastic material flow in friction stir welding, leading to the elimination of void defects.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Chunliang Yang, ChuanSong Wu, Song Gao
Summary: This study provides a deep insight into the relationship between flow stress, temperature, and strain rate in friction stir welding by integrating phase-field simulation of dynamic recrystallization. It introduces a modified constitutive equation considering the DRX softening effect to improve the prediction accuracy in FSW process modeling. The analysis quantitatively evaluates the variation of dislocation density and stress, ultimately enhancing the understanding of the process mechanism.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Guanlan Zhang, ChuanSong Wu, Jinqiang Gao
Summary: This study conducted numerical simulations and experimental validation on the ultrasonic vibration-assisted friction stir welding (UVaFSW) process by considering the synchronous interaction mechanism between ultrasonic vibration, tool, and thermo-mechanical behavior. The results showed that the use of a line source of ultrasonic energy improved the computation accuracy and reduced the interfacial friction coefficient.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Automation & Control Systems
Wenzhen Zhao, ChuanSong Wu, Lei Shi
Summary: The interaction mechanism of ultrasound with the plastically deformed metal in the ultrasonic-assisted friction stir welding (UaFSW) process is studied. It is found that the ultrasonic direction affects the frictional stress distribution, while the ultrasonic intensity determines the antifriction strength. Only when the welding process parameters are suitable, can the ultrasonic field promote the flow velocity and broaden the flow range.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Chunliang Yang, ChuanSong Wu
Summary: A model was developed to study the acoustic plasticity and ultrasonic induced friction reduction (UiFR) effect in ultrasonic vibration enhanced friction stir welding (UVeFSW) of dissimilar Al/Mg alloys. Experimental results showed that the ultrasonic sound pressure and energy were stronger at the aluminum alloy side, and the distribution of acoustic energy exhibited a pattern in the nugget zone. The UiFR effect resulted in a deformed butterfly shape of the friction coefficient at the tool-workpiece interface, reduced heat generation and viscous dissipation, and a less deformed butterfly shape of the heat flux distribution. The calculated results demonstrated that ultrasonic vibration enhanced material flow and promoted the mixing and distribution of dissimilar materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Junjie Zhao, ChuanSong Wu, Lei Shi
Summary: Understanding the microstructure evolution and influence of ultrasonic vibration on friction stir welding (FSW) of dissimilar Al/Mg alloys is crucial for optimizing process parameters and improving joint quality. This study characterized and compared the microstructure evolutions in the weld nugget zone (WNZ) during FSW and ultrasonic vibration enhanced FSW (UVeFSW). The results showed that ultrasonic vibration had a significant effect on the grain structure of the Mg alloy side, changing the dynamic recrystallization mechanism. The application of ultrasonic vibration improved the degree of dynamic recrystallization in the entire weld.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Shuhao Zhu, Naiqian Wang, Shuai Li, Guan Huang, Shang Ge, Peihua Du, Li Zhang, Yufeng Sun, Shaokang Guan
Summary: This study investigated the friction stir welding process of 1500 MPa martensitic steel. The use of pure nickel as a marker material allowed for visualization of material flow behavior during the welding process. The results showed that ultrasonic vibration-assisted welding had better welding quality and higher strength compared to conventional welding.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Manufacturing
Junjie Zhao, Chuan Song Wu, Hao Su
Summary: The study found that the thickness of IMCs on the transverse cross-section of the weld first increases and then decreases as the depth distance from the top surface of the weld gets larger, reaching the maximum value at a depth of about 1 mm. On the horizontal plane at the upper part of the weld, the thickness of IMCs increases first and then decreases as the distance gets farther from the center of the exit hole, and reaches a stable stage outside the range covered by the shoulder. The application of ultrasonic vibration can reduce the thickness of IMCs in the whole weld and shift the peak value of IMCs thickness to a location nearer the exit hole on horizontal planes at both upper and lower parts of the weld.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Automation & Control Systems
Arman Valizadeh, Hamid Montazerolghaem, Javad Jafari Fesharaki
Summary: This study investigates the residual stress of friction stir welding of aluminum 5754 and copper using the ultrasonic method. Results show that the residual stress is higher in the pin area, and adjusting the rotational speed and movement speed can affect the residual stress. Additionally, the residual stress in aluminum is greater than that in copper, attributable to the different thermal conductivity and stiffness of the two materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Yuhang Guo, Xuancheng He, Chaocheng Liu, Chenggang Wei, Rui Yang, Xuguang Dong
Summary: In this study, the effects of ultrasonic assisted friction stir welding (Ua-FSW) and heat pipe assisted friction stir welding (Ha-FSW) on the welding of 4 mm thick 7075 aluminum alloy were investigated. The results showed that both Ua-FSW and Ha-FSW effectively improved the weld forming, with better surface quality observed in Ha-FSW joints. The ultrasound flow effect and heat dissipation from the heat pipe controlled the temperature gradient, resulting in finer grain sizes. These assisted technologies had a greater impact on the thermomechanically affected zone (TMAZ) and heat-affected zone (HAZ), promoting subgrain formation and retention. Ha-FSW also significantly improved the elongation performance of the joints.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Najib A. Muhammad, ChuanSong Wu, Hao Su
Summary: Dissimilar joints made of aluminium alloy and copper were produced using friction stir welding and ultrasonic vibration-assisted friction stir welding processes with different tool offset degrees. Tool offset towards the Al base material and in the Al/Cu interface produced defect-free joints with sound strengths, while tool offset towards the Cu base material resulted in unsound joints with defective features. Ultrasonic vibration addition significantly reduced the thickness of the intermetallic compound layer and affected the sizes and distribution of Cu particles in the weld nugget. Joints made with ultrasonic vibration exhibited higher tensile strength compared to conventional FSW joints.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Stefano Spigarelli, Michael Regev, Alberto Santoni, Marcello Cabibbo, Eleonora Santecchia
Summary: Friction Stir Welding (FSW) causes material microstructure variations and changes in mechanical properties. This study investigates the creep response of pure titanium after FSW, finding that FSW samples have lower creep rates and rupture strains.
Article
Materials Science, Multidisciplinary
Hao Su, Qingzhen Zhao, Ji Chen, Chuansong Wu
Summary: In this study, dissimilar Al/Cu alloys were joined using friction stir welding (FSW) technique with and without ultrasonic vibration. It was found that the assistance of ultrasonic vibration improved the performance of the joint, particularly by reducing the thickness of intermetallic compounds.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Wuhong Xue, Caihong Gao, Zheng Zhang, Tingting Han, Nan Hou, Wenhui Yin, Lei Shi, Xiaoling Wang, Gang Liu, Xiaohong Xu
Summary: This paper introduces a simple and stable Pt/V2O5/Pt structure based on CMOS technology, in which suboxide V2O5-x and Mott VO2 nanochannels are constructed to simulate brain-like processing and nociceptive perception functions, respectively. Simulation results demonstrate that the device exhibits excellent performance in the simulation task.
SCIENCE CHINA-MATERIALS
(2023)
Article
Automation & Control Systems
Xue Wang, Yichen Xiao, Lei Shi, Chuansong Wu, Huijie Liu
Summary: Ultrasonic vibration-enhanced friction stir welding (UVeFSW) improves welding quality and reduces welding loads. The effects of tool pin geometry on heat and mass transfer during UVeFSW were investigated using a computational fluid dynamics model. The study found that the pin diameter and taper angle have little influence on total heat generation, but significantly affect the temperature field near the tool. The torque and force acting on the tool increase with an increase in pin diameter, affecting the plastic material flow behaviors. The model provides a basis for optimizing tool pin diameter and taper angle in UVeFSW.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Najib Ahmad Muhammad, Peihao Geng, ChuanSong Wu, Ninshu Ma
Summary: An in-depth study was conducted on the residual stress in dissimilar ultrasonic vibration-assisted friction stir welding (UVaFSW) of aluminium (Al)/magnesium (Mg) alloys. The use of ultrasonic vibration resulted in predominantly compressive stress in the UVaFSW welds, improving the mechanical properties. The ultrasonic effect reduced the thickness of intermetallic compounds (IMCs), resulting in more homogeneous hardness distributions. Additionally, it mitigated residual tensile stresses and distortion, thus showing potential for co-optimizing residual stress and microstructure in dissimilar Al/Mg welds.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2023)
Article
Engineering, Mechanical
Lei Shi, Jie Chen, Chunliang Yang, Gaoqiang Chen, Chuansong Wu
Summary: In this study, a novel integrated thermal-fluid-structure coupling model of the friction stir welding process was proposed to study the non-uniform distribution model of the tool-workpiece contact pressure and the void defect formation mechanism. The tool service life was also predicted. This research provides important theoretical guidance for optimizing welding parameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Junjie Zhao, ChuanSong Wu, Lei Shi, Hao Su
Summary: A complete understanding of the evolution behaviors of microstructures and intermetallic compounds (IMCs) in friction stir welding (FSW) of dissimilar Al to Mg alloys is crucial. This study conducted conventional FSW and ultrasonic vibration enhanced FSW (UVeFSW) experiments on Al/Mg alloys. The results showed that ultrasonic vibration could suppress the growth of IMCs and lead to a thinner IMC thickness in UVeFSW.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Mechanics
Yan Li, Ze Yun, Xiang Zhou, Chuansong Wu
Summary: The keyhole arc welding technique improves welding efficiency by utilizing a stable keyhole mode. Understanding the keyhole effect is crucial for enhancing welding quality. A three-tier sandwiched model based on multiphysics and multiphase effects was developed to demonstrate open keyhole mode welding. The model fully includes multiphysics phenomena and calculates gas-liquid-solid interactions using the Volume of Fluid technique and the Enthalpy-porous technique.
Article
Metallurgy & Metallurgical Engineering
Yang Chen, Yang Li, Lei Shi, Chuansong Wu, Shengli Li, Song Gao
Summary: Titanium alloy and aluminum alloy have extensive industrial applications; the Ti/Al composite structure joined by double side friction stir welding can utilize the advantages of both materials and has great potential for practical use.
WELDING IN THE WORLD
(2023)
Article
Engineering, Civil
Xue Wang, Xiankun Zhang, Lei Shi, Chuansong Wu, Gaoqiang Chen
Summary: Ultrasonic vibration enhances heat transfer and plastic material flow in friction stir welding, leading to the elimination of void defects.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Xiankun Zhang, Xue Wang, Yang Li, Lei Shi, Chuansong Wu
Summary: The conventional friction stir welded (C-FSW) Ti/Al dissimilar joints often have root defects due to the properties of titanium alloy. Double-side friction stir welding (DS-FSW) is a possible solution to eliminate these defects. This study analyzed the microstructure of the Al/Ti interface in both C-FSW and DS-FSW joints and investigated the effects of root defects. The results suggest that root defects significantly weaken the mechanical properties of Al/Ti C-FSW joints, while DS-FSW joints have higher tensile strength.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2023)
Article
Materials Science, Multidisciplinary
Xue Wang, Yichen Xiao, Lei Shi, Ming Zhai, Chuansong Wu, Gaoqiang Chen
Summary: Experiments have confirmed that tool tilting in friction stir welding (FSW) can effectively prevent void defects. However, the mechanism of this suppressive effect is still unknown. In this study, a CFD model that considers tool tilting is established, and a non-uniform distribution of normal pressure is proposed to explain the relationship between tool tilt angle and tool-workpiece contact interfaces. The results show that tool tilting leads to higher heat flux and temperature near the pin side in the middle and low parts of the workpiece, which helps to heal voids on the advancing side of the FSW joints. The model is validated by experimental results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Guanlan Zhang, Jinqiang Gao, Chuansong Wu
Summary: This paper investigates the numerical prediction and understanding of ultrasonic vibration-assisted friction stir welding (UVaFSW) of dissimilar Al/Mg alloys. By redefining the calculation method of acoustic stress work and developing a modified acoustic-plastic constitutive equation, the quantitative analysis of the acoustic effects on heat generation, material flow, and intermixing in the welding process is conducted. The results show that the ultrasonic vibration has a minor effect on the total heat, but promotes material flow and intermixing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Faliang He, Chuansong Wu, Lei Shi
Summary: This study developed a numerical simulation method to investigate the dynamic recrystallization behavior during friction stir welding of dissimilar Al/Mg alloys. The results show significant changes in grain size and dislocation density during the welding process, with the final grain size on the Al side being lower.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Tao Liu, Song Gao, Xuanyi Shen, Qipeng Yin, Lei Shi, Sachin Kumar, Junnan Qiao, Hui Zhang
Summary: The optimization mechanism of ultrasonic power on the performance of aluminum/steel dissimilar metal ultrasonic vibration enhanced friction stir welding (UVeFSW) joints was studied. The results showed that ultrasonic vibration can improve the surface forming quality of the weld seam, increase the width of the joint interface zone, adjust the height of the hook structure, suppress the generation of intermetallic compounds, and enhance the failure load of the joints.
Article
Nanoscience & Nanotechnology
Jie Zhang, Xiaoyang Chen, MingJian Ding, Jiaqiang Chen, Ping Yu
Summary: This study enhances the compositional inhomogeneity of relaxor ferroelectric thin films to improve their dielectric temperature stability. The prepared films exhibit a relatively high dielectric constant and a very low variation ratio of dielectric constant over a wide temperature range.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaoyu Chen, Ranran Zhang, Hao Zou, Ling Li, Qiancheng Zhu, Wenming Zhang
Summary: Polyaniline-manganese dioxide composites exhibit high conductivity, long discharge platform, and stable circulation, and the specific capacity is increased by providing additional H+ ions to participate in the reaction.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xutao Huang, Yinping Chen, Jianjun Wang, Gang Lu, Wenxin Wang, Zan Yao, Sixin Zhao, Yujie Liu, Qian Li
Summary: This study aims to establish a novel approach to better understand and predict the behavior of materials with multi-scale lamellar microstructures. High-resolution reconstruction and collaborative characterization methods are used to accurately represent the microstructure. The mechanical properties of pearlite are investigated using crystal plasticity simulation and in-situ scanning electron microscopy tensile testing. The results validate the reliability of the novel strategy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Cheng Chen, Fanchao Meng, Jun Song
Summary: This study systematically investigated the unfaulting mechanism of single-layer interstitial dislocation loops in irradiated L12-Ni3Al. The unfaulting routes of the loops were uncovered and the symmetry breaking during the unfaulting processes was further elucidated. A continuum model was formulated to analyze the energetics of the loops and predict the unfaulting threshold.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Darshan Bamney, Laurent Capolungo
Summary: This work investigates the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals, focusing on the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to study the energetic feasibility of CN of ATPs resulting from GB dislocation dissociation. The model reveals that CN is preferred over the nucleation of a single twin variant for low misorientation angle GBs. Further analysis considering GB character and twin system alignment suggests that CN events could be responsible for ATP formation even at low m' values.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Bing Han, Zhengqian Fu, Guoxiang Zhao, Xuefeng Chen, Genshui Wang, Fangfang Xu
Summary: This study investigates the behavior of electric-field induced antiferroelectric to ferroelectric (AFE-FE) phase transition and reveals the evolution of atomic displacement ordering as the cause for the transition behavior changing from sharp to diffuse. The novel semi-ordered configuration results from the competing interaction between long-range displacement modulation and compositional inhomogeneity, which leads to a diffuse AFE-FE transition while maintaining the switching field.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Akib Jabed, Golden Kumar
Summary: This study demonstrates that cryogenic rejuvenation promotes homogeneous-like flow and increases ductility in metallic glass samples. Conversely, annealing has the opposite effect, resulting in a smoother fracture surface.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xin Ji, Yan Chong, Satoshi Emura, Koichi Tsuchiya
Summary: A heterogeneous microstructure in Ti-15Mo-3Al alloy with heterogeneous distributions of Mo element and omega(iso) precipitates has achieved a four-fold increase in tensile ductility without a loss of tensile strength, by blocking the propagation of dislocation channels and preventing the formation of micro-cracks.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Amit Samanta, Prasanna Balaprakash, Sylvie Aubry, Brian K. Lin
Summary: This study proposes a combined large-scale first principles approach with machine learning and materials informatics to quickly explore the chemistry-composition space of advanced high strength steels (AHSS). The distribution of aluminum and manganese atoms in iron is systematically explored using first principles calculations to investigate low stacking fault energy configurations. The use of an automated machine learning tool, DeepHyper, speeds up the computational process. The study provides insights into the distribution of aluminum and manganese atoms in systems containing stacking faults and their effects on the equilibrium distribution.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Guowei Zhou, Yuanzhe Hu, Zizheng Cao, Myoung Gyu Lee, Dayong Li
Summary: In this work, a physics-constrained neural network is used to predict grain-level responses in FCC material by incorporating crystal plasticity theory. The key feature, shear strain rate of slip system, is identified based on crystal plasticity and incorporated into the loss function as physical constitutive equations. The introduction of physics constraints accelerates the convergence of the neural network model and improves prediction accuracy, especially for small-scale datasets. Transfer learning is performed to capture complex in-plane deformation of crystals with any initial orientations, including cyclic loading and arbitrary non-monotonic loading.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Pengfei Yang, Qichang Li, Zhongying Wang, Yuxiao Gao, Wei Jin, Weiping Xiao, Lei Wang, Fusheng Liu, Zexing Wu
Summary: In this study, the HER performance of Ru-based catalysts is significantly improved through the dual-doping strategy. The obtained catalyst exhibits excellent performance in alkaline freshwater and alkaline seawater, and can be stably operated in a self-assembled overall water splitting electrolyzer.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Zening Yang, Weiwei Sun, Zhengyu Sun, Mutian Zhang, Jin Yu, Yubin Wen
Summary: Multicomponent oxides (MCOs) have wide applications and accurately predicting their thermal expansion remains challenging. This study introduces an innovative attention-based deep learning model, which achieves improved performance by using two self-attention modules and demonstrates adaptability and interpretability.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ze Liu, Cai Chen, Yuanxun Zhou, Lanting Zhang, Hong Wang
Summary: This study attempts to address the gap in cooling rates between thin film deposition and bulk metallic glass (BMG) casting by correlating the glass-forming range (GFR) determined from combinatorial materials chips (CMCs) with the glass-forming ability (GFA) of BMG. The results show that the full-width at half maximum (FWHM) of the first sharp diffraction peak (FSDP) is a good indicator of BMG GFA, and strong positive correlations between FWHM and the critical casting diameter (Dmax) are observed in various BMG systems. Furthermore, the Pearson correlation coefficients suggest possible similarities in the GFA natures of certain BMG pairs.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Mike Schneider, Jean-Philippe Couzinie, Amin Shalabi, Farhad Ibrahimkhel, Alberto Ferrari, Fritz Koermann, Guillaume Laplanche
Summary: This work aims to predict the microstructure of recrystallized medium and high-entropy alloys, particularly the density and thickness of annealing twins. Through experiments and simulations, a database is provided for twin boundary engineering in alloy development. The results also support existing theories and empirical relationships.
SCRIPTA MATERIALIA
(2024)
