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Preparation of a novel ultra-high strength Al–Si–Cu–Ni alloy at room/elevated temperature by squeeze casting combined with a new heat treatment process

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Progress in Natural Science:materials International 2024年第4期34卷 690-701页

作者： Shulin Lü Shilong Li Zhaoxiang Yan Shusen Wu Jianyu Li Xiaoyuan Ji State Key Lab of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

In this paper, the microstructure evolution and properties of squeeze-cast Al–8Si-1.5Cu–1Ni-0.5Mg-0.5Mn-0.2V-0.2Ti-0.2Zr alloy（hereafter, Al–Si–Cu–Ni alloy for short） were investigated under various solution processes,evaluating the mechanical properties at room and elevated temperatures for both as-cast and T6-treated *** results showed that following the optimal two-stage solution（i.e., solution at 510°C for 6 h + solution at 530°C for 8 h） and subsequent aging at 190°C for 10 h, referred to as the S530-T6 treatment, the Al–Si–Cu–Ni alloy exhibited excellent room/high temperature performance. The ultimate tensile strength（UTS）, yield strength（YS）and elongation of the alloy at room temperature were 410 MPa, 368 MPa and 1.5 %, and the UTS, YS and elongation of alloy at 300°C were 177 MPa, 170 MPa and 6 %, respectively. The increase in strength at room temperature is mainly attributed to the spheroidization of eutectic silicon and the precipitate strengthening aroused from uniformly dispersed nano-sized Q-Al4Cu2Mg8Si7, σ-Al5Cu6Mg2and θ'-Al2Cu phases, while the increase in strength at high temperature is due to the formation of heat-resistant Ni-rich phases and the improvement of the micromorphology of high melting point intermetallic compounds.

关键词： Al-Si-Cu-Ni alloy Heat treatment Squeeze casting Ultra-high strength Microstructure

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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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How could imperfect device properties influence the performances of spiking neural networks?

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Science China(Information Sciences) 2023年第8期66卷 233-242页

作者： Jingyang CHEN Zhihao WANG Tong WANG Heming HUANG Zheyuan SHAO Zhe WANG Xin GUO State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology

Spiking neural networks(SNNs) provide an efficient way to apply artificial intelligence systems on edge devices. Memristive devices with tunable conductance states can be used to emulate the functions of biological neurons and synapses and to build SNNs. In this work, fully-connected SNNs based on various memristive devices are constructed, and a hardware-compatible spike-timing-dependent plasticity(STDP)learning rule is applied to train the SNNs. Strategies are designed to suppress the overfitting problem and improve the performance of the SNNs in the case of a small training set. However, the properties of memristive devices are never perfect. The effects of imperfect device properties, e.g., asymmetric weight update, insufficient number of conductance states, and low on/off ratio, on the performance of the SNNs are elab.rated.

关键词： oxides memristive devices device properties spiking neural networks neuromorphic computing

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Unraveling the incompatibility mechanism of ethylene carbonate-based electrolytes in sodium metal anodes

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Journal of Energy Chemistry 2024年第7期94卷 560-567页

作者： Daomin Qin Fangyuan Cheng Meilian Cao Feiyang Yan Qian Wang Chun Fang Jiantao Han State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074HubeiChina

Ethylene carbonate(EC)is widely used in lithium-ion batteries due to its optimal overall performance with satisfactory conductivity,relatively stable solid electrolyte interphase(SEI),and wide electrochemical *** is also the most widely used electrolyte solvent in sodium ion ***,compared to lithium metal,sodium metal(Na)shows higher activity and reacts violently with EC-based electrolyte(NaPF_(6)as solute),which leads to the failure of sodium metal batteries(SMBs).Herein,we reveal the electrochemical instability mechanism of EC on sodium metal battery,and find that the com-bination of EC and NaPF_(6) is electrically reduced in sodium metal anode during charging,resulting in the reduction of the first coulombic efficiency,and the continuous consumption of electrolyte leads to the cell *** address the above issues,an additive modified linear carbonate-based electrolyte is provided as a substitute for EC based ***,ethyl methyl carbonate(EMC)and dimethyl carbon-ate(DMC)as solvents and fluoroethylene carbonate(FEC)as SEI-forming additive have been identified as the optimal solvent for NaFP_(6)based electrolyte and used in Na_(4)Fe_(3)(PO_(4))_(2)(P_(2)O_(7))/Na *** batter-ies exhibit excellent capacity retention rate of about 80%over 1000 cycles at a cut-off voltage of 4.3 V.

关键词： Na metal batteries Ethylene carbonate decomposition Na_(4)Fe_(3)(PO_(4))_(2)(P_(2)O_(7))cathode Interface engineering Ethylene carbonate-free electrolyte

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Electrochemical anodic oxidation assisted fabrication of memristors

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International Journal of Extreme Manufacturing 2024年第3期6卷 250-272页

作者： Shuai-Bin Hua Tian Jin Xin Guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Owing to the advantages of simple structure,low power consumption and high-density integration,memristors or memristive devices are attracting increasing attention in the fields such as next generation non-volatile memories,neuromorphic computation and data ***,the deposition of memristive films often requires expensive equipment,strict vacuum conditions,high energy consumption,and extended processing *** contrast,electrochemical anodizing can produce metal oxide films quickly(e.g.10 s) under ambient *** means of the anodizing technique,oxide films,oxide nanotubes,nanowires and nanodots can be fabricated to prepare *** film thickness,nanostructures,defect concentrations,etc,can be varied to regulate device performances by adjusting oxidation parameters such as voltage,current and *** memristors fabricated by the anodic oxidation technique can achieve high device consistency,low variation,and ultrahigh yield *** article provides a comprehensive review of the research progress in the field of anodic oxidation assisted fabrication of ***,the principle of anodic oxidation is introduced;then,different types of memristors produced by anodic oxidation and their applications are presented;finally,features and challenges of anodic oxidation for memristor production are elab.rated.

关键词： anodic oxidation anodized aluminium oxide memristor resistive switching electrical properties

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Manipulating Zn^(2+)solvation environment in poly(propylene glycol)-based aqueous Li^(+)/Zn^(2+)electrolytes for high-voltage hybrid ion batteries

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Carbon Energy 2023年第12期5卷 125-136页

作者： Hang Lu Sheng Zheng Lu Wei Xiaodong Zhang Xin Guo State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Compared with aqueous single-ion batteries,rechargeable aqueous hybrid ion batteries,especially Li^(+)/Zn^(2+)hybrid ion batteries,are receiving extensive interest owing to their low cost,high operating voltage,and energy ***,their working voltage and lifespan are limited by the decomposition of water and the growth of Zn ***,detrimental side reactions induced by the water reduction and the Zn dendrite growth are successfully suppressed by a poly(propylene glycol)(PPG)-based hybrid ion electrolyte[(1 m Zn(TFSI)2+10 m LiTFSI)in PPG/H2O].The addition of PPG in the electrolyte can not only enhance the bonding strength of hydrogen-bond in water but also tailor the solvation sheath of Zn2+as revealed by synchrotron *** participated solvation of PPG with Zn^(2+)can weaken Zn-H_(2)O interactions and redistribute Zn^(2+)flux on the surface of the Zn anode,thus inducing favorably even deposition of *** addition,the decomposition of TFSI-contributes a ZnF_(2)-enriched solid electrolyte interface at the Zn anode to further prevent water decomposition and restrain Zn *** PPG-based electrolyte enables 2.1 V LiMnO_(2)//Zn batteries to deliver high specific capacities(121.7 mAh g^(-1)for a coin cell and 90 mAh g^(-1)for a pouch cell),and maintain 80%of the capacity over 700 cycles at 0.5 C,suggesting a promising pathway for highly reversible aqueous hybrid ion batteries.

关键词： high voltage aqueous electrolyte hybrid ion battery molecular interaction poly(propylene glycol) zinc metal anode

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Sodium-ion conducting polymer electrolytes

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Rare Metals 2023年第1期42卷 1-16页

作者： Zhi-Yong Li Zhuo Li Jia-Long Fu Xin Guo State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Almost unlimited reserves and low cost of sodium are accelerating the commercialization of sodiumion ***,serious safety and stability issues,arising mainly from organic liquid electrolytes,hinder further developments of sodium-ion *** electrolytes might be a solution to the safety and stability issues due to the better safety of ***,an overview is provided on recent advances in polymer electrolytes for solid-state sodium batteries,including solid polymer electrolytes,composite polymer electrolytes and gel polymer *** properties,ionic conduction mechanisms and promising applications of polymer electrolytes are discussed,and pending challenges and effective solutions are ***,this review will promote commercial applications of polymer electrolytes in energy storage systems.

关键词： Polymer electrolyte Ionic conductivity Ionic conduction mechanism Sodium-ion battery(SIB) Solidstate battery(SSB)

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Progress in preparation of AlN-reinforced magnesium matrix composites:A review

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China Foundry 2024年第1期21卷 1-10页

作者： Lu Chen Shu-lin Lü Di-jia Zhao Wei Guo Jian-yu Li 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

As a ceramic material,AlN has very good thermophysical and mechanical *** addition,AlN is an effective refining agent for Mg alloys because it has a lattice constant similar to that of ***,AlN is an ideal reinforcement for magnesium matrix composites(MMCs),and is attracting increasing *** review addresses the development of preparation technologies for AlN-reinforced Mg matrix *** mainstream preparation techniques include stir casting,melt infiltration,powder metallurgy,and in-situ *** addition,the advantages and disadvantages of these techniques are analyzed in depth,and it is pointed out that the next direction for the preparation of high-performance AlN-reinforced MMCs is less aluminization and multiple technologies integration.

关键词： AlN MMCs preparation thermophysical property mechanical property

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Magnetic nanofluid-based liquid marble for a self-powered mechanosensation

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Droplet 2024年第3期3卷 57-64页

作者： Manhui Chen Ziwei Liu Yike Li Shanfei Zhang Peng Chen Pengyu Zhang Bin Su State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Magnetic nanofluid possesses the characteristic of interfering with the propagation of the magnetic field,endowing it with the sensing property in ***,the residual adhesion of magnetic nanofluid as it flows over solid surfaces remains an open *** marbles allow for quantities of liquids to be encapsulated by hydrophobic particles,ensuring a unique nonstick property for utilization in different *** this study,being capsuled by hydrophobic nano-/microscale powders,a magnetic nanofluid-based liquid marble(MNLM)with well mechanical stability has been fabricated.A magnetic nanofluid posture detector(MNPD),which consists of an MNLM,a magnetic tube,and coils,has been assembled that can convert mechanical energy to electricity as it freely rolls on the solid *** recognition can be achieved when combining five MNPDs with *** fabricated MNPD possesses a good signal recognition capability,which can separately distinguish the bending of each ***,a variety of language hand gestures with specific meanings(dig-its,letters,“OK,”and“I Love You”)can be further recognized through corresponding *** potential of MNPD in the realm of gesture recognition will offer a novel avenue for flexible wearables.

关键词： wear fluid property

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Improving thermal conductivity of Mg-Si-Zn-Cu alloy through minimizing electron scattering at phase interface

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Journal of Magnesium and Alloys 2024年第9期12卷 3717-3728页

作者： Lu Chen Shulin Lü Jianyu Li Wei Guo Shusen Wu State Key Lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074PR China

The primary cause of the decrease in thermal conductivity of conventional thermal conductive magnesium alloys is electron scattering brought on by solute ***,the impact of phase interface on thermal conductivity of magnesium alloys is usually *** study has developed a Mg-Si-Zn-Cu alloy with high thermal conductivity that is distinguished by having a very low solute atom content and a significant number of phase *** thermal conductivity of the Mg^(-1).38Si-0.5Zn-0.5Cu alloy raises from its untreated value of 133.2 W/(m·K)to 142.2 W/(m·K),which is 91%of the thermal conductivity of pure *** is accomplished by subjecting the alloy to both 0.8wt%Ce modification and T6 heat *** morphology of eutectic Mg_(2)Si phase is changed by Ce modification and heat treatment,and as a result,the scattering of electrons at the Mg_(2)Si/Mg interface is reduced,resulting in increase of the alloy’s thermal conductivity.

关键词： Thermal conductivity Ce modification Mg_(2)Si Heat treatment

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