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Mechanical Response and Superelastic Properties of Cu-11.85Al-3.2Mn-0.1Ti TPMS Structures Printed by Laser Powder Bed Fusion

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Chinese Journal of Mechanical Engineering 2025年第1期38卷 17-30页

作者： Mingzhu Dang Honghao Xiang Jingjing Li Chunsheng Ye Chao Cai Qingsong Wei State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Triply periodic minimal surfaces(TPMS)are structures with smooth surfaces and excellent energy absorption *** new functional materials,such as shape memory alloys,with TPMS structures provides a novel and promising research *** this study,three TPMS structures(Gyroid,Diamond,and Primitive)of Cu-11.85Al-3.2Mn-0.1Ti alloy were printed by laser powder bed fusion,which is favorable for the fabrication of complex *** manufacturing fidelity,mechanical response,and superelastic properties of the three structures were *** distributions in the three structures during compression were analyzed by finite element(FE)*** three structures were equipped with high-quality,glossy surfaces and uniform ***,due to powder adhesion and forming steps,there were volumetric errors and dimensional deviations between the samples and the CAD *** errors were within 1.6%for the Gyroid and Diamond *** dimensional deviations at the nodes in the three structures were less than 0.09 *** microstructures of all structures wereβ1´martensite,consistent with the cubic *** results of compression showed that the structures underwent a layer-by-layer compression failure mode,and the Primitive structures exhibited a more pronounced oscillatory *** Diamond structures showed the highest first fracture stress and strain of 164.67 MPa and 13.89%,*** also possessed the lowest yield strength(61.97 MPa)and the best energy absorption properties(7.6 MJ/m3).Through the deformation analysis,the Gyroid and Diamond structures were found to fracture at a 45°direction,while the Primitive structures fractured *** findings were consistent with the results obtained from the FE simulation,which showed equivalent stress *** applying various pre-strains,the Diamond structures displayed the highest superelastic strain of up to 3.53%.The superelastic recovery of all samples r

关键词： Laser powder bed fusion Shape memory alloy Triply periodic minimal surfaces Mechanical response Energy absorption

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Influence of surface layer slurry temperature on surface cracks and holes of ZTC4 titanium alloy by investment casting

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China Foundry 2025年第1期22卷 90-98页

作者： Wei-dong Li Xu-na Shi State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Luoyang Ship Material Research Institute Luoyang 471039China Luoyang Ruize Petrochemical Engineering Co. Ltd.Luoyang 471003China

In this work,the influences of surface layer slurry at different temperatures(10℃,14℃,18℃,22℃)on wax patterns deformation,shrinkage,slurry coating characteristics,and the surface quality of the casting were investigated by using a single factor variable *** surface morphologies of the shell molds produced by different temperatures of the surface(first)layer slurries were observed via electron ***,the microscopic composition of these shell molds was obtained by EDS,and the osmotic effect of the slurry on the wax patterns at different temperatures was also assessed by the PZ-200 Contact Angle *** forming reasons for the surface cracks and holes of thick and large ZTC4 titanium alloy by investment casting were *** experimental results show that the surface of the shell molds prepared by the surface layer slurry with a low temperature exhibits noticeable damage,which is mainly due to the poor coating performance and the serious expansion and contraction of wax pattern at low *** second layer shell material(SiO_(2),Al_(2)O_(3))immerses into the crack area of the surface layer,contacts and reacts with the molten titanium to form surface cracks and holes in the *** the increase of the temperature of surface layer slurry,the damage to the shell surface tends to weaken,and the composition of the shell molds'surface becomes more uniform with less *** results show that the surface layer slurry at 22℃is evenly coated on the surface of the wax patterns with appropriate thickness,and there is no surface shell mold rupture caused by sliding slurry after sand *** surface layer slurry temperature is consistent with the wax pattern temperature and the workshop temperature,so there is no damage of the surface layer shell caused by expansion and ***,the shell mold prepared by the surface layer slurry at this temperature has good integrity,isolating the contact between the low inert

关键词： titanium alloy surface layer slurry surface cracks surface holes investment casting

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B2-CuZr reinforced amorphous alloy matrix composites:A review

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China Foundry 2025年第1期22卷 1-11页

作者： Wei Guo Run-hua Huang Zhen Zhang Mi Zhao Jin-cheng Wang Yan-qiang Qiao Shu-lin Lü Shu-sen Wu State Key Lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057GuangdongChina

B2-CuZr phase reinforced amorphous alloy matrix composites has become one of the research hotspots in the field of materials science due to the“transformation-induced plasticity”phenomenon,which makes the composites show better macroscopic plastic deformability and obvious work-hardening behavior compared to the conventional amorphous alloy matrix composites reinforced with ductile ***,the in-situ metastable B2-CuZr phase tends to undergo eutectoid decomposition during solidification,and the volume fraction,size,and distribution of B2-CuZr phase are difficult to control,which limits the development and application of these *** date,much efforts have been made to solve the above problems through composition optimization,casting parameter tailoring,and post-processing *** this study,a review was given based on relevant studies,focusing on the predictive approach,reinforcing mechanism,and microstructure tailoring methods of B2-CuZr phase reinforced amorphous alloy matrix *** research focus and future prospects were also given for the future development of the present composite system.

关键词： amorphous alloy matrix composite B2-CuZr phase plasticity microstructure tailoring

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Vertical channels enable excellent lithium storage kinetics and cycling stability in silicon/carbon thick electrode

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Carbon Energy 2025年第2期7卷 54-65页

作者： Wen Zhang Zihan Zhang Xinxin Wang Wanming Li Qin Chen Wangting Zhong Junhong Wei Zihe Chen Shuibin Tu Xiancheng Wang Yuchen Tan Yun Zhang Huiqiao Li Yongming Sun Huamin Zhou Hui Yang State Key Laboratory of Material Processing and Die&Mould Technology Department of MechanicsSchool of Aerospace EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanHubeiChina School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhanHubeiChina Shenzhen Research Institute of Huazhong University of Science and Technology ShenzhenChina

Constructing silicon(Si)-based composite electrodes that possess high energy density,long cycle life,and fast charging capability simultaneously is critical for the development of high performance lithium-ion batteries for mitigating range anxiety and slow charging issues in new energy ***,a thick silicon/carbon composite electrode with vertically aligned channels in the thickness direction(VC-SC)is constructed by employing a bubble formation *** experimental characterizations and theoretical simulations confirm that the obtained vertical channel structure can effectively address the problem of sluggish ion transport caused by high tortuosity in conventional thick electrodes,conspicuously enhance reaction kinetics,reduce polarization and side reactions,mitigate stress,increase the utilization of active materials,and promote cycling stability of the thick ***,when paired with LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622),the VC-SC||NCM622 pouch type full cell(~6.0 mAh cm^(-2))exhibits significantly improved rate performance and capacity retention compared with the SC||NCM622 full cell with the conventional silicon/carbon composite electrode without channels(SC)as the *** assembled VC-SC||NCM622 pouch full cell with a high energy density of 490.3 Wh kg^(-1)also reveals a remarkable fast charging capability at a high current density of 2.0 mA cm^(-2),with a capacity retention of 72.0%after 500 cycles.

关键词： high transport kinetics silicon/carbon anode structural stability thick electrode vertical channels

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Toward Understanding of the No-bake Resin Pyrolysis Mechanism during Sand Casting Process

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International Journal of Metalcasting 2025年 1-13页

作者： Peng, Xin Qi, Yuyang Liu, Zhenwei Wan, Peng Li, Wen Shen, Xu Ji, Xiaoyuan Yin, Yajun Li, Yuancai Zhou, Jianxin State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science & Technology Hubei Wuhan 430074 China School of Mechanical & Electrical Engineering Wuhan Institute of Technology Wuhan 430205 China Department of Material Science and Technology Huazhong University of Science and Technology Wuhan China

Resin-bonded sand is widely utilized in molding and core making during sand casting. The organic binders within the sand mold undergo pyrolysis upon direct contact with high-temperature molten metal during casting, leading to the formation of some casting defects related to sand mold and sand core. In order to clarify the specific mechanism of this process, it is necessary to explore the changes in the resin itself and its resin-bonded sand at high temperatures. In this article, sample preparation and storage conditions are controlled to match actual foundry conditions for the following analyses: The pyrolysis process of three types of resin-bonded sand during actual casting production is analyzed through thermal analysis, revealing different reaction stages and products during the heating process for different resins. Additionally, the compressive strengths of the three kinds of resin-bonded sand are directly measured at different resin contents and temperatures varied from 500 to 900 °C, enabling the establishment of a correlation between macro-level strength changes and internal resin pyrolysis. This study holds significant importance for better understanding the pyrolysis mechanism of resin and addressing casting defects related to the high-temperature mechanical properties of molds (cores). © American Foundry Society 2025.

关键词： alkaline phenolic resin furan resin high temperature compressive strength phenolic urethane resin resin-bonded sand sand

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Dynamic simulation of the effect of carbon deposition on the performance and durability of syngas-fueled SOFC with external manifold

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International Journal of Hydrogen Energy 2025年 136卷 440-455页

作者： Zeng, Yong Zhang, Hongwei Shi, Ruyu Yan, Dong Jia, Lichao Zhang, Wenying School of Mechanical Engineering and Electronic Information China University of Geosciences Wuhan430074 China Center for Fuel Cell Innovation State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

Carbon deposition occurs during the operation of hydrocarbon-fueled solid oxide fuel cell (SOFC). This study develops a three-dimensional dynamic SOFC single-cell model considering carbon deposition to investigate its impact on performance degradation. The results show that external manifolds, interconnect ribs, and diffusion resistance in porous electrodes lead to significant differences in carbon concentration across electrode regions. Over time, the inconsistency of carbon concentration increases, with the gradient rising from 2361 mol/m3 (40 d) to 8038.46 mol/m3 (150 d). The uneven distribution of carbon concentration causes inconsistent degradation of porosity, permeability, and reaction activity across electrode regions, significantly reducing SOFC gas transport performance, output performance, and temperature. Optimizing the external manifold design to enhance gas flow uniformity mitigates the uneven distribution of carbon concentration across electrode regions. At t = 150 d, the carbon concentration gradient decreases from 8038.46 mol/m3 to 1795.08 mol/m3. Correspondingly, the uniformity of porosity, permeability, reaction activity, and temperature distribution across electrode regions is significantly enhanced, benefiting SOFC long-term stability. © 2025 Hydrogen Energy Publications LLC

关键词： Digital elevation model

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Investigation of the effect of sinusoidal flow channel structures on the steady state and transient characteristics of SOFC

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International Journal of Hydrogen Energy 2025年 136卷 477-490页

作者： Li, Min Huang, Zian Yan, Dong Jia, Lichao Zhang, Wenying School of Mechanical Engineering and Electronic Information China University of Geosciences Wuhan430074 China Center for Fuel Cell Innovation State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

The modification of flow channel structure is one of the effective ways to improve the mass transfer and electrochemical performance of solid oxide fuel cell (SOFC). In this study, a three-dimensional multi-physics coupling model is used to investigate the effects of vertical and horizontal sinusoidal flow channel designs on the steady state and transient performance of SOFC. The results show that compared with the traditional rectangular flow channel, the net power density of the cell increases by 7.58 % and 12.25 % under the vertical and horizontal sinusoidal flow channel designs, respectively. This is mainly due to the enhanced convective mass transfer and improved oxygen concentration distribution under the ribs by the sinusoidal flow channels. Although it results in an increase of 15.2763 Pa and 0.00367 W/cm2 in the maximum pressure drop and pump power, respectively, the increase is still within acceptable limits. In addition, the design of the sinusoidal flow channel effectively reduces the cathode concentration polarization and activation polarization during voltage switching, and exhibits excellent dynamic response and anti-interference ability, enabling faster stabilization after voltage changes. Among them, the horizontal sinusoidal flow channel structure shows more excellent performance in SOFC steady state and transient state. © 2025 Hydrogen Energy Publications LLC

关键词： Osmosis

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Effect of Al on the sealing performance of Al-Al2O3 composite materials for intermediate temperature planar SOFC application

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Ceramics International 2025年第14期51卷 19524-19534页

作者： Zhao, Xuepeng Wang, Xiaochun Wu, Biao Dang, Siyuan Li, Li Wang, Wei Gu, Yinwen Pu, Jian School of Automobile and Traffic Engineering Jiangsu University of Technology Jiangsu Changzhou213001 China Center for Fuel Cell Innovation School of Materials Science and Engineering State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science & Technology Hubei Wuhan430074 China Jiangsu Jingci Intelligent Sensing Technology Research Insitute Co. LTD Jiangsu Changzhou213001 China

To satisfy the requirements of planar solid oxide fuel cell (SOFC) in reliable gas tightness for the separation of fuel and oxidant, Al-Al2O3 composite seals with various Al amounts of 10–30 wt% are fabricated in this work and afterwards, effect of Al on their thermal expansion behavior and gas leakage rate are investigated at different temperatures. It is demonstrated that the presented Al-Al2O3 composite seal containing 15 wt% Al (denoted as A15) exhibits a low gas leakage rate of 0.021 sccm cm−1 under input gas pressure of 20.7 kPa between 650 °C and 800 °C. Further studies show that stable leakage rates can be maintained below 0.027 sccm cm−1 after enduring 10 thermal cycles or holding for 100 h test at 750 °C, revealing that a small amount of Al addition could significantly improve the sealing performance and thermal cycle stability of Al-Al2O3 composite seal. XRD and SEM results suggest that A15 has excellent structural stability and interfacial chemical compatibility, which can be attributed to the continuous oxidation of Al powders blocking the leakage paths and the formation of the well bonding interface between interconnect/seal/cell anode. It is also found that the open circuit voltage (OCV) of 1-cell stack is 1.13 V at 750 °C for 100 h and undetectable voltage degradation are observed which means the A15 composite seal has excellent gas tightness for 1-cell stack. The experimental results confirm the promising potential of Al-Al2O3 composite seal in SOFC application, which provides a new direction for the development of high performance seal material in the future. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Aluminum oxide

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Phase engineering of H/T-Nb_(2)O_(5) homojunction for enhanced lithium-ion storage

ChemPhysMater

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ChemPhysMater 2025年第1期4卷 3-8页

作者： Sheng Li Jun Li Wenjie Zhang Sherif A.El‐Khodary Yubo Luo Dickon H.L.Ng Xiaoshui Peng Jiabiao Lian State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)Shenzhen 518172China

Phase engineering has gained significant attention in energy-storage applications due to its ability to tailor the physicochemical properties and functionalities of electrode *** this study,we demonstrate the in-situ partial phase conversion of niobium pentoxide(Nb2O5),resulting in the formation of a monoclinic/orthorhombic(H/T-Nb2O5)heterophase *** study further confirms that the unique heterophase interface plays a crucial role in regulating the local electronic environment,resulting in charge redistribution,the formation of an internal electric field,and enhanced electron ***,the presence of abundant phase interfaces offers additional reactive sites for Li+ion adsorption,thereby enhancing reaction *** synergistic effects within the H/T-Nb2O5 homojunction are reflected in its high Li+storage capacity(413 mAh g^(−1) at 100 mA g^(−1)),superior rate capability,and cycling ***,this study demonstrates that the construction of heterophase homojunctions offers a promising strategy for developing high-performance anode materials for efficient Li-ion storage.

关键词： Phase engineering Monoclinic/Rthorhombic Nb2O5 homojunction Kinetics analysis Li-ion storage

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Leaky integrate-and-fire and oscillation neurons based on ZnO diffusive memristors for spiking neural networks

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Science China materials 2025年第4期68卷 1212-1219页

作者： Liang Wang Le Zhang Shuaibin Hua Qiuyun Fu Xin Guo Engineering Research Center for Functional Ceramics of Ministry of Education School of Integrated CircuitsHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Diffusive threshold switching(TS)memristors have emerged as a promising candidate for artificial neurons,effectively replicating neuronal functions and enabling spiking neural networks(SNNs)to emulate the low-power processing of biological *** this study,we present an artificial neuron based on a Pt/Ag/ZnO/Pt volatile memristor,which exhibits exceptional TS characteristics,including electro-forming-free operation,low voltage requirements(<0.2 V),high stability(2.25%variation over 1024 cycles),a high on/off ratio(106),and inherent *** Pt/Ag/ZnO/Pt diffusive memristors are employed to simultaneously emulate oscillation neurons and leaky integrate-and-fire(LIF)neurons,enabling precise modulation of oscillation and firing frequencies through pulse parameters while maintaining low energy consumption(1.442 nJ per spike).We further integrate the oscillation and LIF neurons as input and output neurons,respectively,in a two-layer SNN,achieving a high classification accuracy of 89.17%on MNIST-based voltage *** work underscores the potential of ZnO diffusive memristors in emulating stable artificial neurons and highlights their promise for advanced neuromorphic computing applications using SNNs.

关键词： threshold-switching memristor volatile diffusive memristor oscillation neurons leaky integrate-and-fire neurons spiking neural networks

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