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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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Topologically close-packed intermetallic alloy electrocatalysts for CO_(2) reduction towards high value-added multi-carbon chemicals

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Chinese Chemical Letters 2025年第1期36卷 6-7页

作者： Qiyan Wu Qing Li State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The continuous combustion of unsustainable carbon-based fossil fuels has dramatically accelerated the increase in carbon dioxide(CO_(2))concentration in the atmosphere(from approximately278.3 ppm in 1750 to 417.9 ppm in 2023),which would exacerbate environmental problems such as greenhouse effect[1].The effective electrosynthesis of high value-added multi-carbon(C_(2+))chemicals(e.g.,ethanol,ethylene)from CO_(2) reduction reaction(CO_(2)RR)is a promising strategy to mitigate these environmental issues mentioned above but remains highly challenging due to the competition of hydrogen evolution reaction(HER)and low selectivity of target products.

关键词： intermetallic alloy carbon

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Oxygen vacancies-rich TiO_(2-x) enhanced composite polyurethane electrolytes for high-voltage solid-state lithium metal batteries

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Nano Research 2025年第4期18卷 228-237页

作者： Xiaoning Xu Fei Pei Wenjie Lin Jia Lei Yuhan Yang Henghui Xu Zhen Li Yunhui Huang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Dongfeng Motor Corporation Research&Development Institute Wuhan 430058China

Due to the favorable interfacial stability with electrodes,excellent processability,and reasonable material cost,organic-inorganic composite solid-state electrolytes have attracted broad interests in the field of solid-state *** this study,we have developed a solid-state composite electrolyte with polyurethane(PU)as polymer matrix and TiO_(2-x) as nanofiller(denoted as PUL-TiO_(2-x)).The block copolymer PU features alternating soft and hard segments,which offers distinct advantages due to its unique structural *** soft segment of the block copolymer facilitates the dissociation of lithium salt,enabling the conduction of Li^(+),while the rich hydrogen bond network formed by the hard segment ensures the mechanical strength of the *** profusion of Lewis acid sites on the TiO_(2-x) surface facilitates interactions with ether oxygen groups and bistrifluoromethanesulfonimide(TFSI-)anions,thereby enhancing ionic conductivity(σ)and expanding the electrochemical stability window of the ***,the PUL-TiO_(2-x) electrolyte exhibits an impressiveσof 2.19×10^(-4) S·cm^(-1) at 40℃,a Li^(+)transference number of 0.47,and an electrochemical stability window of 4.98 *** resulting LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)||Li battery demonstrates a specific capacity of 171 mAh·g^(-1) and exhibits excellent cycling stability,maintaining its performance over 270 cycles at 40℃.These findings underscore the immense potential of the PUL-TiO_(2-x) in advancing the development of high-performance all-solid-state lithium batteries.

关键词： polyurethane electrolyte composite polymer electrolytes high-voltage cathodes solid-state lithium metal batteries

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Enhanced electrochemical corrosion resistance of 316L stainless steel manufactured by ultrasonic rolling assisted laser directed energy deposition

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China Foundry 2025年第2期22卷 182-194页

作者： Guan Liu Yi-gui Su Xu-yu Pi Dong-xu Wen De-fu Liu Yong-cheng Lin School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Under the laser directed energy deposition(LDED)process,the rapid melting and solidification usually lead to the emergence of pores and coarse columnar dendrites,which in turn compromise the properties of the deposited *** study introduced in-situ ultrasonic rolling(UR)as an innovative method to enhance the corrosion resistance of LDED specimens,and the microstructural characteristics and their correlation with corrosion resistance were deeply *** findings reveal that the LDED-UR specimen exhibits a reduction in both the fraction and size of *** the influence of severe plastic deformation generated by LDED-UR process,fully equiaxed grains appear with a reduced average size of 28.61μm(compared to63.98μm for the LDED specimen with columnar grains).The electrochemical corrosion resistance of the LDED-UR specimen is significantly enhanced compared to the LDED *** enhanced corrosion resistance can be attributed to the low fraction of small-sized pores,the fine and uniformly distributed Cr-enriched ferrite phase,and the formation of a compact and thick passive film due to dense grain *** insight of the correlation between microstructure and corrosion behavior opens up a new pathway to enhance the corrosion resistance of LDED specimens.

关键词： laser directed energy deposition ultrasonic rolling 316L stainless steel microstructure electrochemical corrosion resistance

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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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Improving the reliability of classical molecular dynamics simulations in battery electrolyte design

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Journal of Energy Chemistry 2025年第2期101卷 34-41,I0002页

作者： Xin He Yujie Zhang Haomiao Li Min Zhou Wei Wang Ruxing Wang Kai Jiang Kangli Wang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology College of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan 430074HubeiChina Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of TechnologyWuhan 430068HubeiChina

Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.

关键词： Electrolyte Classical molecular dynamics Solvation structure Simulations

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Revealing ionically isolated Li loss in practical rechargeable Li metal pouch cells

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Science Bulletin 2025年第6期70卷 914-922页

作者： Xiangrui Duan Yuanjian Li Kai Huang Shuibin Tu Guocheng Li Wenyu Wang Hongyu Luo Zihe Chen Chunhao Li Kai Cheng Xin-Xin Wang Li Wang Yongming Sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Material Processing and Die&Mold Technology Department of MechanicsSchool of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Nuclear&New Energy Technology Tsinghua UniversityBeijing 100084China

The degradation of rechargeable lithium(Li)metal batteries is primarily attributed to active Li loss,encompassing isolated Li,also known as“dead Li”,and solid electrolyte interphase(SEI-Li).Comprehending the formation of dead Li is pivotal for devising strategies to mitigate Li ***,we reveal the existence of an alternative form of dead Li,termed ionically isolated Li(I-iLi),which diverges from the traditionally recognized electronically isolated Li(E-iLi).This phenomenon is elucidated through a quantitative analysis of electrolyte-dependent capacity recovery at a specific state of health(SOH)in high-energy pouch cells,which originates from disconnections within the Li-ion percolation network induced by electrolyte ***,we propose the electrolyte infilling ratio(EFR),contingent upon the porosity of Li deposits and electrolyte retention,as a criterion to evaluate electrode *** uphold a high EFR environment,we introduce stress modulation to compact the anode structure and mitigate electrolyte degradation,significantly reducing the I-iLi content from 21%at 0.1 MPa to 1%at 1 *** these insights,a prototype anode-free LiNi_(0.95)Mn_(0.03)Co_(0.02)O_(2)||Cu pouch cell(1.4 Ah)achieves an extraordinary cell-level energy density of 551 Wh kg^(−1)and maintains 70%capacity after 100 cycles at 0.2 C.

关键词： Dead Li Ionically isolated Li Electrolyte infilling ratio Li metal batteries Lean electrolyte conditions

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Flexible polyvinylidene fluoride/multiwall carbon nanotube-based thermoelectric composite films with excellent environmental stability and enhanced power factor from ferroelectric polarization

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Science China materials 2025年第4期68卷 1240-1248页

作者： Qinghui Jiang Zhenxiang Yu Xinyue Zhang Shanliang Chen Jitao Yi Yong Liu State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Foshan(Southern China)Institute for New Materials Foshan 528220China

Flexible thermoelectric(TE)films and devices have potential applications in wearable technology and the Internet of *** of the main challenges is how to simultaneously achieve good TE performance and high chemical/thermal stability in air with low cost and large-scale *** address this,we utilized tape casting to fabricate composite films of polyvinylidene fluoride(PVDF)and multi-walled carbon nanotubes(MWCNTs).In the composite,polarβ-PVDF introduced by hot pressing can decouple the electrical conductivity and Seebeck coefficient and significantly lead to enhanced power factor of MWCNTs/PVDF composite *** a result,the MWCNTs(60 wt%)/PVDF film has a power factor of 1.1-1.4µW m^(-1) K^(-2) near room *** film also has excellent flexibility and stability in the *** power factor is decreased by only 9%after 1000 bends and can keep stable in air for above 6 months,which is much longer than that(15 days)of Bi2Te3/PEDOT:PSS film.A demo TE device with 10 p-type legs has an output voltage of 11.5 mV and output power of 47.53 nW at a temperature difference of 60°*** above descriptions make the MWCNTs/PVDF films have a significant advantage in the commercial application of flexible TE devices.

关键词： thermoelectric PVDE carbon nanotube tape casting ferroelectric polarization

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Laser powder bed fusion of WE43 magnesium alloy with superior balance of strength and ductility

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Journal of Magnesium and Alloys 2025年第3期13卷 1275-1293页

作者： Wenhe Xu Jikang Li Zhenwu Zhang Hongwei Yuan Guojin An Hai Shi Chao Cai Wenming Jiang Wei Li Qingsong Wei State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Guizhou Aerospace Nanhai Science&Technology Co. Ltd.Zunyi 563000China Guizhou Aerospace Fenghua precision equipment Co. LtdGuiyang 550009China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan430081China

WE43 is a high-strength magnesium alloy containing rare-earth elements such as Y,Gd and ***,how to further obtain the balance of strength and ductility,as well as the manufacture of complex structures is still a dilemma for its engineering *** this study,WE43 alloy samples withﬁne microstructures,high densiﬁcation and excellent mechanical properties were successfully prepared by laser powder bed fusion(LPBF)additive *** optimal process window was established,and the formation mechanisms of three types of porosity defects were revealed,namely lack-of-fusion pores,meltﬂuctuation-induced pores,and keyhole-induced *** the combined process of laser power of 200 W and scanning speed of 600 mm/s,samples with a high density of 99.89%were ***,periodic heterogeneous microstructure was prepared along the build direction,i.e.,ﬁne grains(∼4.1μm)at melt pool boundaries and coarse grain(∼23.6μm)inside melt *** was mainly due to the preferential precipitation of Zr and Mg3(Gd,Nd)nano-precipitates at the melt pool boundaries providing nucleation sites for the *** special feature could provide an extra hetero-deformation induced(HDI)strengthening and retard *** optimal tensile yield strength,ultimate tensile strength and elongation at break were 276±1 MPa,292±1 MPa and 6.1±0.2%,*** obtained tensile properties were superior to those of other magnesium alloys and those fabricated by other *** solid solution strengthening(∼24.5%),grain boundary strengthening(∼14.4%)and HDI strengthening(∼32.2%)were the main sources of high yield *** work provides a guidance on studying the pore defect suppression and strengthening mechanisms of WE43 alloy and other magnesium alloys produced by LPBF.

关键词： Laser powder bed fusion(LPBF) WE43 alloy Pore defect Microstructure Strengthening mechanisms

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