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Towards reducing planar anisotropy in AZ91 magnesium alloy sheets with different loading modes: Experiment and simulation

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Materials Characterization 2025年 225卷

作者： Chai, Fang Feng, Jianqiang Han, Xinghui Ma, Zhiyuan Wang, Yonggui Hu, Xuan Hua, Lin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Xiangyang441000 China

Uniform forming for high-performance magnesium alloy components puts forwards a requirement on magnesium alloy sheets with low planar anisotropy, and planar anisotropy can be effectively reduced by many severe plastic deformation technologies. In the present study, to clarify the effect of different loading modes on reducing planar anisotropy, initially-extruded AZ91 magnesium alloy sheets were subjected to single degree-of-freedom rolling and entire forging. Experimental investigation and modeling simulation were carried out to compare and analyze the planar anisotropy reduction with different loading modes in AZ91 magnesium alloy sheets. The initially-extruded AZ91 magnesium alloy sheet exhibits obviously different texture components with extra basal texture along initial extrusion direction and different proportion of prismatic and pyramid textures in different directions, and consequently evident planar anisotropy. After subjected to the two technologies, except for a little remaining basal texture along initial extrusion direction, there are only prismatic and pyramid texture in all directions both for the single degree-of-freedom and entire forged AZ91 magnesium alloy sheets. Compared with single degree-of-freedom rolled one, the entirely forged AZ91 magnesium alloy sheet exhibits much more similar proportion of prismatic and pyramid texture in all directions. Except for the strength of the single degree-of-freedom rolled one, both the two technologies can effectively reduce planar anisotropy of strength and plasticity in relative to initially-extruded one. The planar anisotropy reducing is mainly attributed to combined contribution of similar microstructure and texture through experimental observation plus similar strain-effective, stress-effective and metal flow through simulation in different directions. It is expected that this study will provide the optimal loading mode for reducing planar anisotropy in magnesium alloy sheets. © 2025

关键词： Degrees of freedom (mechanics)

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Microstructure and mechanical properties of ZK61 magnesium alloy thin-walled cylindrical component processed by two-step forging

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Journal of Magnesium and Alloys 2025年

作者： Chai, Fang Feng, Jianqiang Han, Xinghui Zhuang, Wuhao Chen, Yizhe Hu, Zhili Hu, Xuan Zheng, Fangyan Hua, Lin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Xiangyang441000 China

Magnesium alloy thin-walled cylindrical components with the advantages of high specific stiffness and strength present broad prospect for the lightweight of aerospace components. However, poor formability resulting from the hexagonal close-packed crystal structure in magnesium alloy puts forwards a great challenge for thin-walled cylindrical components fabrication, especially for extreme structure with the thickness-changing web and the high thin-wall. In this research, an ZK61 magnesium alloy thin-walled cylindrical component was successfully fabricated by two-step forging, i.e., the pre-forging and final-forging is mainly used for wed and thin-wall formation, respectively. Microstructure and mechanical properties at the core, middle and margin of the web and the thin-wall of the pre-forged and final-forged components are studied in detail. Due to the large strain-effectiveness and metal flow along the radial direction (RD), the grains of the web are all elongated along RD for the pre-forged component, where an increasingly elongated trend is found from the core to the margin of the wed. A relatively low recrystallized degree occurs during pre-forging, and the web at different positions are all with prismatic and pyramid textures. During final-forging, the microstructures of the web and the thin-wall are almost equiaxed due to the remarkable occurrence of dynamic recrystallization. Similarity, except for few basal texture of the thin-wall, only prismatic and pyramid textures are found for the final-forged component. Compared with the initial billet, an obviously improved mechanical isotropy is achieved during pre-forging, which is well-maintained during final-forging. © 2025

关键词： Magnesium alloys

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Catalytic Purification of NO_(x) and PM by Fe-Doped CuCrO_(2) Catalyst Using Two Kinds of Carriers

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Journal of Wuhan University of technology(Materials Science) 2025年第3期40卷 721-727页

作者： LU Fangzhou WANG Wei WANG Mengxiao School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Tech-nology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China Hubei Research Center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China UNSW School of Mechanical and Manufacturing Engineering Kensington CampusUNSW SydneyHigh StKensington NSW 2052Australia

Fe-doped CuCrO_(2) catalyst CuCr_(1-x)Fe_xO_(2) series were prepared by the sol-gel method with different Fe *** structure and properties of the catalysts were investigated by XRD(X-ray diffraction),SEM(scanning electron microscope),and XPS(X-ray photoelectron spectroscopy)and the purification effect on NO_(x) and PM was measured through simulated emission *** results indicate that CuCrO_(2) catalyst has good catalytic activity,the maximum NO_(x) conversion rate can be up to 28.15%,and the ignition temperature of PM can be reduced to 285℃.When the molecular ratio of Cr:Fe=9:1,the catalyst can achieve better catalytic effect,the maximum NO_(x) conversion rate will be up to 30.25%and the PM ignition temperature can be reduced to 280℃.In addition,the catalytic activity of catalyst supported on different carriers was also *** results show that catalyst on SiC foam ceramic carrier has better catalytic activity than that on cordierite honeycomb ceramic *** maximum NO_(x) conversion of CuCrO_(2) and CuCr_(0.9)Fe_(0.1)O_(2) can be increased by 0.72%and 1.33%respectively,and the PM ignition temperature can be further reduced by 15 and 5℃respectively.

关键词： Fe-doped CuCrO_(2)catalyst NO_(x) PM purification carrier

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Optimization of porous transport layer for overall performance improvement in unitized regenerative fuel cell under clamping pressures

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Renewable Energy 2025年 251卷

作者： Chen, Ke Xiong, Zhongzhuang He, Dandi Luo, Zongkai Zou, Guofu Chen, Wenshang Chen, Ben Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China

The porous transport layer (PTL) in a Unitized Regenerative Fuel Cell (URFC) is essential for achieving high electrochemical performance and operational stability. It facilitates gas diffusion, regulates water-gas transport, and supports electrochemical reactions. Clamping pressure profoundly influences URFC performance by altering key properties such as porosity, permeability, electrical conductivity, and the contact resistance between the PTL and bipolar plate. Thus, the interplay between clamping pressure and the PTL is critical for optimizing URFC performance. This study focuses on investigating the effects of clamping pressure on URFC performance, uncovering key principles for optimizing PTL structural properties to enhance the overall performance of the URFC. Simulation results based on a two-dimensional finite element model and a three-dimensional two-phase electrochemical model reveal that clamping pressure induces asymmetric mechanical behavior in the PTL on either side of the URFC. As clamping pressure increases, significant changes occur in transport properties, which strongly affect mass transfer processes in the URFC. Furthermore, the study integrates Box-Behnken design, artificial neural networks, and the non-dominated sorting genetic algorithm-II method to develop a precise regression model for identifying optimal design solutions. Under the optimized configuration, the URFC's input power density and output power density increased by 4.08 % and 9.47 %, respectively, while the round-trip efficiency improved by 14.13 % compared to conventional configurations. © 2025 Elsevier Ltd

关键词： Diffusion in gases

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Researches on the Growth of Lithium Deposition in Lithium-Ion Batteries During Long-Term Cycling of Slight Overcharging

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Energy technology 2025年

作者： Zhang, Yizhuo Liu, Yihui Wu, Panyun Wang, Yiping Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Centre for Automotive Components Technology Wuhan University of Technology Wuhan430070 China

In the entire life cycle of lithium-ion batteries, there may be long-term cycling of overcharging conditions. Therefore, a high-fidelity model that is analyzed for the physical characteristics of lithium-ion batteries during long-term cycling of overcharging conditions is required. Based on the pseudo-2D (P2D) model, a P2D with a variable solid-phase diffusion coefficient electrochemical model is built. This model is used to study the changes in the physical properties of automotive lithium-ion batteries, including the relative capacity, the generation of lithium metal deposition, and solid electrolyte interface (SEI) film. The SEI film and lithium deposition of lithium-ion batteries have been analyzed under different charge/discharge rates and values of overcharge conditions. It is found that the lithium plating is influenced by both the overcharged value and the charging current rate. Lithium metal deposition has a greater impact on the capacity fading of batteries than the generation of SEI films. There is competition between the generation of SEI films and that of the lithium metal deposition process, and lithium metal deposition inhibits the generation of SEI films. The lithium dendrite and SEI films always grow in parallel coupling. © 2025 Wiley-VCH GmbH.

关键词： Lithium-ion batteries

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Enhancing fracture toughness of Al/CFRP joints bonded with CNT-modified epoxy adhesive using ultrasonic adhesive-impact bonding process

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Journal of Materials Research and technology 2025年 36卷 5559-5573页

作者： Yaoyao Wang Hui Wang Yizhe Chen Wei Zhou Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China School of Vehicle and Traffic Engineering Henan Institute of Technology Xinxiang 453000 China Hubei Longzhong Laboratory Xiangyang 441000 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070 China

Incorporating carbon nanotubes (CNTs) into epoxy adhesives can enhance the fracture toughness of adhesively bonded joints, but the effectiveness is limited by the challenge of embedding CNTs into the micropores on adherend surface that prevents the formation of adequate interfacial fiber bridging, as well as the insufficient interfacial adhesion between the CNTs and adhesive. This study introduced a novel ultrasonic adhesive-impact bonding process in which ultrasonic vibrations are applied to a CNT-modified epoxy adhesive on the adherend surfaces before joint fabrication to enhance the mode-I fracture toughness of Al/CFRP joints. The results showed that this process increased the mode-I energy release rate ( G Ic ) reached 2.91 N/mm, representing an increase of 36.62 % compared to the joints bonded using conventional bonding process. The toughening mechanisms were analyzed from both physical and chemical perspectives using SEM, XPS, and FTIR techniques. On one hand, the ultrasonic adhesive-impact bonding process enhanced the infiltration of CNT-modified epoxy adhesive into the micropores on the Al surface through the synergistic effects of reduced adhesive viscosity and micro-liquid jet impacts, thereby improving mechanical interlocking and strengthening the fiber bridging of the CNTs at the interface. On the other hand, the ultrasonic adhesive-impact bonding process accelerated the chemical reactions of the adhesive with the aminated CNTs and the chemical groups of Al surface, which enhanced the interfacial adhesion between the CNTs and adhesive, and increased the number of C–O–Al bonds at the interface, forming an efficient stress transfer.

关键词： Ultrasonic adhesive-impact bonding process Mode-I fracture toughness CNT-modified epoxy adhesive Toughening mechanisms

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Two-Stage Hand-Eye Calibration based on Variance Minimization Principle

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Ding, Tao Tian, Dazhuang Wu, Hao Zhu, Dahu Li, Wenlog Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan430070 China Wuhan University of Technology Hubei Digital Manufacturing Key Laboratory School of Mechanical and Electronic Engineering Wuhan430070 China Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Provincial Engineering Research Center of Robot and Intelligent Manufacturing Wuhan430070 China Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Wuhan430074 China

Hand-eye calibration in industrial scenarios greatly determines the efficiency and effectiveness of 3D vision-guided robotic tasks. Most of the existing hand-eye calibration methods, however, rely on collecting large-scale point cloud samples to guarantee high measurement accuracy, which is time-consuming and particularly influenced by measurement defects such as local missing, noise, and uneven density. To overcome this challenging problem, we present a novel two-stage hand-eye calibration method based on the variance minimization principle. In the first stage, a robust function weighted variance minimization (RFWVM) registration algorithm is proposed for fine registration of defective point clouds, aiming at solving the coarse hand-eye calibration matrix with few-shot point clouds. In the second stage, an objective function of the calibration error correction algorithm is established via the point-to-plane distance variance minimization, which is intended to suppress the influence of measurement defects. Through these two stages, the globally optimal hand-eye matrix is solved by iteratively correcting the coarse hand-eye calibration matrix. A series of experiments validate the universality, accuracy, and robustness of the proposed method. © 1963-2012 IEEE.

关键词： Error correction

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Achieving enhanced thermoelectric and mechanical performance in p-type bismuth telluride through constrained hot deformation

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Ceramics International 2025年

作者： Chen, Quansheng Ji, Chen Yu, Jian Hua, Lin Zhao, Wenyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Jiujiang University Jiujiang332005 China Hubei Key Laboratory of Advanced Technology for Automobile Components Wuhan University of Technology Wuhan430070 China

Bi2Te3-based alloys remain the only commercially available thermoelectric (TE) materials. However, their practical applications are severely constrained by the inferior mechanical performance of the zone melting (ZM) ingot. Herein, a simple constrained hot deformation (CHD) technology was developed to prepare the p-type Bi0.5Sb1.5Te3 polycrystalline materials derived from ZM ingots. It was discovered that the deformation process has negligible impact on the phase composition, but can efficiently refine the grains to approximately 5 μm through the dynamic recrystallization and simultaneously introduce high-density dislocations. Although the donor-like effect induced by deformation would obviously deteriorate the electrical conductivity, the recovery effect triggered by high deformation temperature can effectively optimize the carrier concentration and thus alleviate the degradation of power factor. The material deformed at 773 K maintains a relatively high power factor ∼3.33 mW K−2 m−1 at 300 K, together with a significantly decreased lattice thermal conductivity ∼0.59 W m−1 K−1, and an improved zT ∼1.1 was obtained ultimately. More importantly, the deformed materials show a significant improvement in mechanical performance due to the grain refinement. A maximum average Vickers hardness of 0.67 GPa was achieved for the material deformed at 723 K, which is ∼40 % higher than that of the ZM ingot. Our work indicates the simple CHD is an efficient technology to synergistically enhance both TE and mechanical properties of Bi2Te3-based ZM ingot. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Polycrystalline materials

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Deformation behavior and its mechanism of Al–Zn–Mg–Cu alloys in different heat treatment states under electrically-assisted uniaxial tension

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Journal of Materials Research and technology 2025年 36卷 4162-4185页

作者： Yanli Song Long Chen Chuanchuan Hao Hainan Xu Lin Hua Jue Lu Lechun Xie Qian Sun Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan 430070 China Hubei Research Center for New Energy & Intelligent Connected Vehicle Wuhan University of Technology Wuhan 430070 China

Electrically-assisted manufacturing has proven to be an efficient process in improving formability for metal alloys. However, there are relatively few studies on the mechanism of the deformation behavior of Al–Zn–Mg–Cu alloys in different heat-treated states under electrically-assisted quasi-static uniaxial tension (EAT). This study presents the effects of EAT on the mechanical properties and microstructure of materials. The results showed that under suitable EAT parameters, the true strain of AA 7075-T6 is reduced by about 12.04 %, while the true strain of AA 7075-O is significantly increased by about 78.79 %. The electrical current reduces dislocation density, refines the recrystallized grains and increases the Cube texture content in AA 7075-O. From thermodynamic and kinetic perspectives, the athermal effects induced by electrical current are beneficial in promoting the dynamic dissolution of the metastable phase in AA 7075-T6 and the local dynamic precipitation of the GPII region in AA 7075-O, respectively. The stress drops and strain hardening behaviors were analyzed using the Orowan and the dislocation density strengthening equation. And, a mechanism for the improved plasticity of EAT in AA7075-O was revealed.

关键词： Aluminum alloy Electroshock treatment Dislocation Electroplasticity Mechanical property

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A simplified electrochemical lithium-ion batteries model based on physics-informed LSTM_Res network

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International Journal of Heat and Mass Transfer 2025年 246卷

作者： Kong, Chun Zhu, Guorong Wang, Jing V. Kang, Jianqiang Wang, Qian State Key Laboratory of Maritime Technology and Safety Wuhan University of Technology Wuhan430070 China School of Automation Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China

Due to the high computational complexity of traditional electrochemical models, applying them to real-time battery management systems (BMS) is challenging. Most simplified electrochemical models lack sufficient accuracy due to assumptions and errors in the simplified solutions of partial differential equations. To strike a balance between complexity and accuracy, a Long Short-Term Memory Network with Residual Electrochemical Model (LrEM) for lithium-ion batteries is proposed. In this model, solid-phase lithium-ion transfer is approximated using a Long Short-Term Memory Network with Residuals (LSTM_Res), while lithium-ion transfer in the electrolyte is modeled using a standard Long Short-Term Memory (LSTM) network. The networks within the LrEM are trained by the underlying physical mechanisms in lithium-ion batteries. The results demonstrate that the LrEM can precisely predict the concentration of lithium ions in both solid and electrolyte phases, as well as accurately forecast the voltage under various current rates. Notably, the LrEM can complete 8000 s of charge and discharge dynamics in just 1.499 s, making it feasible for implementation in future real-time BMS. This advancement significantly enhances the mass transfer understanding and prediction in lithium-ion batteries, paving the way for more efficient and accurate battery management. © 2025 Elsevier Ltd

关键词： Lithium-ion batteries

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