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Modeling of microstructure and microsegregation evolution in solidification of ternary alloys

Chinese Physics B 2025年第5期34卷 505-515页

作者： Qiannan Yu Mengdan Hu Jinyi Wu Dongke Sun School of Mechanical Engineering Southeast UniversityNanjing 211189China Jiangsu Key Laboratory for Biomaterials and Devices Southeast UniversityNanjing 211189China Key Laboratory of Structure and Thermal Protection of High Speed Aircraft Ministry of EducationSchool of Mechanical EngineeringSoutheast UniversityNanjing 211189China

The microstructure formed during solidification has a significant impact on the mechanical properties of *** this study,a two-dimensional(2D)cellular automaton(CA)-finite difference(FD)-CALPHAD model was developed to simulate the formation of microstructure and solute segregation in the solidification processes of ternary *** the model,dendritic growth is simulated using the CA technique,while solute diffusion is solved by the FD method,and the CALPHAD method is employed to calculate thermodynamic phase equilibrium during *** CA-FD-CALPHAD coupled model is capable of reproducing the evolution of continuous nucleation and growth of grains as well as the evolution of the microstructure and solute distribution during solidification of ternary *** this study,Al–Zn–Mg ternary alloy is taken as an example to simulate the growth of equiaxed and columnar grains and the columnar-to-equiaxed transition(CET)under different solidification *** simulation results are compared with experimental data from the literature,showing a good ***,the study also investigates the evolution of temperature and multicomponent solute fields during solidification and the effects of alloy composition and cooling rate on the microstructure *** results reveal that the initial alloy composition and cooling rate significantly affect dendritic morphology and solute *** initial alloy concentrations promote the growth of side branches in equiaxed grains,leading to more pronounced solute segregation between *** the cooling rate increases,the average grain size of the equiaxed grains decreases ***,a higher cooling rate accelerates the columnar-to-equiaxed transition,leading to a finer grain structure.

关键词： ternary alloys solidification dendrite columnar-to-equiaxed transition cellular automaton

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Flutter Analysis of Telescopic Wing structures Based on Non-Matching Grid Contact Equivalence

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SSRN 2025年

作者： Li, Yilin Zhu, Rui Hang, Xiaochen Chen, Qiang Fei, Qingguo Southeast University Nanjing211189 China Nanjing Forestry University Nanjing211189 China School of Mechanical Engineering Key Laboratory of Structure Thermal Protection for High Speed Aircraft China School of Mechanical Engineering Key Laboratory of Structure Thermal Protection for High Speed Aircraft China School of Mechanical and Electronic Engineering China School of Mechanical Engineering Key Laboratory of Structure Thermal Protection for High Speed Aircraft China

The frequency-domain flutter analysis method requires a linear model as input, when a telescopic actuator is applied to morphing aircraft, traditional frequency-domain flutter analysis methods face challenges in address issues involving contact nonlinearity. To overcome this limitation, this paper presents a flutter analysis method for morphing aircraft wing structures based on an equivalent modeling approach. The proposed method uses rod elements as the equivalent linearization elements and avoids the need to handle node correspondence issues. The model is parameterized by the rod element's elastic modulus, contact surface distance, and element length coefficient. Upon completion of the equivalent modeling, flutter analysis can be performed. The proposed method increases modeling efficiency while maintaining the accuracy of the model. A simulation study of a typical hypersonic telescopic wing structure is conducted. The effects of angle of attack and altitude on flutter characteristics are analyzed. The proposed method effectively captures both the static and dynamic characteristics of the original structure. The flutter Mach number decreases with increasing extension length and angle of attack, and it increases with altitude. The flutter frequency decreases with increasing extension length, angle of attack, and altitude. © 2025, The Authors. All rights reserved.

关键词： Particle swarm optimization (PSO)

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An anisotropic lattice Boltzmann-phase field model for dendrite growth and movement in rapid solidification of binary alloys

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npj Computational Materials 2024年第1期10卷 2591-2606页

作者： Shilin Mao Yuting Cao Wei Chen Dongke Sun Key Laboratory of Structure and Thermal Protection of High Speed Aircraft Ministry of EducationSchool of Mechanical EngineeringSoutheast UniversityNanjing 211189China Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing 211189China Department of Mechanical Engineering University of Michigan2350 Hayward St.G.G.Brown BuildingAnn ArborMI 48109USA Power Beam Processing Lab AVIC Manufacturing Technology InstituteBeijing 100024China

A model coupling the lattice Boltzmann and the phase field methods with anisotropic effects is proposed,which is used to numerically describe the growth and movement of dendrites in rapid solidification of *** model is quantitatively validated by the simulation of the continuous growth and the drafting-kissing-tumbling phenomenon of two falling particles.

关键词： solidification alloys anisotropic

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Surrogate-Assisted Reliability Assessment Method for the Interface Strength of Embedded Sensors in the thermal protection structure

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SSRN 2025年

作者： Li, Yan-Bin Wei, Zi-Chen Chen, Qiang Ma, Han Jiang, Chun-Yan Fei, Qing-Guo School of Mechanical Engineering Southeast University Nanjing211189 China Jiangsu Engineering Research Center of Aerospace Machinery Nanjing211189 China Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft Ministry of Education Nanjing211189 China

For the embedded sensors in the thermal protection structure (TPS) of high-speed aircraft, the severe thermal and mechanical loads could lead to the shear failure of the interface for embedded sensors, which could further affect the monitoring function of sensors. In this work, a reliability simulation algorithm is proposed to assess the reliability of the interface considering various uncertain parameters. First, the uncertain shear strength of the interface is investigated through the experiments and the Bayesian probabilistic approach. Then, an efficient surrogate model to predict the shear stress response of the interface is constructed using the deep learning method and simulation results. By involving uncertain material paraments, the time-varying structural stress response is efficiently predicted. Ultimately, the stress-strength interference model is used to access the reliability of the interface at varying time and different locations. The results indicate that the proposed surrogate-assisted reliability assessment method could evaluate the interface strength of embedded sensors efficiently and accurately. The reliability of the interface is contingent upon the time-varying external load and the location of sensors within TPS. © 2025, The Authors. All rights reserved.

关键词： Shear stress

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Temperature Effects on Low Cycle Fatigue Deformation of Powder Metallurgy Superalloy Fgh95

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SSRN 2024年

作者： Li, Yanjie Liu, Yibin Wu, Kesi Sun, Jie Zhang, Dahai Fei, Qingguo Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft Ministry of Education Southeast University Nanjing210096 China Jiangsu Engineering Research Center of Aerospace Machinery Southeast University Nanjing210096 China School of Mechanical Engineering Southeast University Nanjing210096 China Suzhou Laboratory Suzhou215000 China

The macroscopic morphology and microstructure evolution mechanism of the FGH95 alloy were investigated with regard to fracture under low-cycle fatigue at different temperatures. The fracture modes of the FGH95 alloy at 420°C, 510°C, and 600°C were found to fall into two main categories: shear fracture at low temperatures (420°C, 510°C) and I type fracture at high temperatures (600°C). The change in fracture mode can be attributed to the increase in strength of the precipitated phase with temperature. At low temperatures, the dislocation structure moves mainly by cutting, bypassing the precipitated phase by climbing at high temperatures. The different movement of the dislocations leads to the different fracture types of FGH95 alloy at different temperatures. © 2024, The Authors. All rights reserved.

关键词： Fracture

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Unveiling the role of SiC particle reinforcement on aluminum matrix composites surface: insights into PEO coating growth, electrical insulation, and corrosion resistance

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Ceramics International 2025年

作者： Jiang, Chunyan Wang, Yaming Chen, Qiang Ying, Guobing Fei, Qingguo Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft Ministry of Education Jiangsu Engineering Research Center of Aerospace Machinery School of Mechanical Engineering Southeast University NanJing211189 China School of Materials Science and Engineering Southeast University NanJing211189 China Institute for Advanced Ceramics Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of Technology Harbin150080 China State Key Laboratory of Precision Welding & Joining of Materials and Structures Harbin Institute of Technology Harbin150080 China

In this work, the SiC particle size in the SiCp/Al substrate is controlled in both basic electrolyte and nanoparticle-containing electrolyte to explore the coating microstructure and performance. The results indicate that larger SiC particles strongly hinder plasma discharge breakdown on the substrate surface, which negatively affects the dense growth of coatings in the basic electrolyte but promotes the densification of plasma electrolytic oxidation (PEO) reactive co-deposition coatings. The coatings formed in the basic electrolyte achieve a thickness of 40 μm, with increasing SiC particle size leading to higher porosity inside the coating. In contrast, the PEO reactive co-deposition coatings reach a thickness of up to 130 μm, and their porosity decreases with increasing SiC particle size. Regarding electrical insulation properties, the PEO reactive co-deposition coatings follow a similar trend to those in the basic electrolyte. While, their breakdown voltage is nearly double that of the coatings formed in the basic electrolyte, and their electrical resistivity is approximately threefold higher. Additionally, the two types of coatings demonstrate contrasting trends in corrosion resistance. Compared to the coatings formed in the basic electrolyte, the PEO reactive co-deposition coatings show a one-order-of-magnitude reduction in corrosion current and a nearly fourfold increase in polarization resistance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Corrosion resistant coatings

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The failure mechanisms and durability of C/SiC composites with jointed features under cyclic thermo-mechanical loading

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Journal of Materials Science 2025年第25期60卷 10301-10318页

作者： Xu, Peifei Tan, Zhiyong Wu, Zhenqiang Zhang, Peiwei Li, Yanbin Zhang, Dahai Zhou, Zhengong Fei, Qingguo School of Mechanical Engineering Southeast University Nanjing People’s Republic of China Ministry of Education Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft Southeast University Nanjing People’s Republic of China Jiangsu Engineering Research Center of Aerospace Machinery Southeast University Nanjing People’s Republic of China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle Technology Beijing People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin People’s Republic of China

C/SiC composites are crucial materials in hot structures of reusable high-speed aircraft, which are faced by the extreme service environments requiring more stringent material designs. In this work, the thermo-mechanical coupling failure mechanisms and durability of C/SiC composite with jointed features are investigated comprehensively. The study demonstrates that the rivet significantly reduces the stress concentration factor (SCF) of open-hole composite structures from 1.76 to 1.35, while achieving a remarkable fourfold enhancement in fatigue life under identical stress levels. Compared to the constant service environment, it is found that the dynamic thermo-mechanical coupling load would further deteriorate the performances of materials, in which the structural fatigue life has decreased by approximately 40%. Oxidative damage of carbon fibers under cyclic high-temperature oxidative environments constitutes the fundamental mechanism for fatigue life degradation in the material. When superimposed with cyclic stress, this process synergistically exacerbates material degradation, accelerating performance deterioration. Finally, a modified stiffness degradation model considering the oxidation damage resulting from the cyclic thermo-mechanical coupling load is proposed to establish the relationship between the residual performance of C/SiC composites and cyclic numbers. The results of this work provide novel insights into the design of C/SiC composite structures for reusable high-speed aircraft.

关键词： Fracture mechanics

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Inverse design of radiation property in photonic crystal used for a novel thermal protection structure

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Applied thermal Engineering 2025年 278卷

作者： Han Ma Zichen Wei Qiang Chen Chunyan Jiang Qingguo Fei Department of Aerospace School of Mechanical Engineering Southeast University NanJing 211189 China Jiangsu Engineering Research Center of Aerospace Machinery NanJing 211189 China Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft Ministry of Education NanJing 211189 China

The thermal protection structure is an important component of high-speed aircraft, faces the challenges of improving thermal insulation capabilities. Photonic crystal is expected to improve the thermal insulation performance of thermal protection structures due to the typical characteristics of forbidden band properties. An inverse design method for photonic crystal is proposed to realize the effective regulation of the radiation property. A data-driven framework for inverse design of photonic crystal is established based on a bidirectional neural network model. The influence analysis of reflectivity and the directed design are carried out to verify the proposed method. A novel thermal protection structure using photonic crystal is developed, and the radiative heat transfer analysis under high-temperature environment is performed to verify the effectiveness. The results show that the thermal insulation ability can be significantly improved by the developed model scheme using the proposed method, which can be applied to the design of thermal protection structure in high-speed aircraft.

关键词： thermal insulation

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Numerical study on the migration of drug carriers in capillaries with the immersed boundary-lattice Boltzmann method

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AIP Advances 2025年第6期15卷

作者： Hou, Yulin Hu, Mengdan Sun, Dongke Sun, Yueming School of Chemistry and Chemical Engineering Southeast University Nanjing211189 China Key Laboratory of Structure Thermal Protection of High Speed Aircraft Ministry of Education Southeast University Nanjing211189 China Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University Nanjing211189 China

The study of drug delivery in the microcirculatory system has received widespread attention among researchers from different fields. In this study, a three-dimensional lattice Boltzmann method (LBM) coupled with the immersed boundary method (IBM) is applied to study the migration of cells and particles within capillaries. In this method, a multi-relaxation-time-LBM is employed to simulate the blood flow, and an energy model based on the finite element method is applied to calculate the particle dynamics. The fluid-particle interaction is solved using the IBM. The numerical model was validated and demonstrated great agreement with analytical solutions and previous studies. Drug carriers (DCs) with varying sizes and stiffness are considered in the simulation. Their impact on particles’ migration behaviors in straight capillaries is mainly explored. Results show that DC sizes have a significant impact on their motion trajectories and equilibrium regions. DCs of nanoscale exhibit excellent stability and uniform distribution during migration. The expansion of DC sizes increases their migration probability toward the vessel wall, resulting in greater motion confusion. Meanwhile, DCs of lower stiffness contribute to unstable trajectories and a significant increase in motion confusion, while their interactions with red blood cells (RBCs) are enhanced under conditions of high stiffness. DCs with moderate stiffness not only maintain stable motion but also exert minimal impact on the migration of RBCs. These findings afford valuable insights for the conception and design of DCs for biomedical applications. © 2025 Author(s).

关键词： Medical nanotechnology

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Interaction of gas bubbles and dendrite interfaces during directional solidification: Modeling and experiment

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Materials & Design 2025年 256卷

作者： Mengdan Hu Dongke Sun Qingyu Zhang Mingfang Zhu Key Laboratory of Structure and Thermal Protection of High Speed Aircraft Ministry of Education School of Mechanical Engineering Southeast University Nanjing 211189 China Shagang School of Iron and Steel Soochow University Suzhou 215137 China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

A two-dimensional (2-D) cellular automaton–finite difference–lattice Boltzmann (CA–FD–LB) model, combined with in situ directional solidification experiments using a transparent SCN-ACE alloy, is employed to investigate gas bubble–dendrite interactions. The model couples CA for dendrite growth, FD for solute diffusion, and the Shan–Chen LB method for multiphase fluid dynamics. Validation tests, including Laplace’s law and contact angle predictions, confirm the model’s reliability. Simulations and experiments under comparable solidification conditions systematically explore two key interaction modes: bubble engulfment and entrapment. Results show that bubbles act as solute sinks, locally altering the solute field and accelerating solid envelope formation. Quantitative analyses reveal that larger bubbles induce stronger solute redistribution, suppress side branches, and promote dendrite spacing adjustment by eliminating and regenerating dendrites. The relative position between the bubble and dendrite tip also significantly affects interaction morphology. Furthermore, multibubble–multidendrite interactions are modeled to reflect complex real conditions. The simulated dendrite evolution, solute field variation, and interface morphology show good agreement with experimental observations, demonstrating the model’s capability to capture realistic phase interactions and to provide insights into the mechanism of bubble-induced perturbations in solidification microstructures.

关键词： Directional solidification Bubble–dendrite interaction Interface morphology evolution Solute redistribution Microstructure modeling

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