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Slippery Surface with Petal-like Structure for Protecting Al alloy: Anti-corrosion, Anti-fouling and Anti-icing

Journal of Bionic Engineering 2022年第1期19卷 83-91页

作者： Junfei Huang Jiajie Kang Jiaxu Zhang Jinxia Huang Zhiguang Guo School of Engineering and Technology China University of GeosciencesBeijing100083China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou451283China

The harsh working environment affects the performance and usage life of al and its alloys,thus limiting their application.In recent years,Slippery Liquid-infused Porous Surface(SLIPS)has attracted much attention due to excellent anti-corrosion,anti-fouling and anti-icing properties.This may be an effective way to improve the properties of al and its alloys.Here,the SLIPS with petal-like structure was constructed on the Al alloy via simple hydrothermal reaction,Stearic Acid(STA)modification and lubricant injection.A variety of droplets(including oil-in-water emulsions)can slide on the SLIPS at a low angle,even the Sliding Angle(SA)of the water droplet is only 3°.Furthermore,the SLIPS exhibits outstanding mechanical and chemical properties.It can maintain fine oil-locking ability under high shearing force and keep slippery stability after immersion in acid/alkaline solutions.In addition,the SLIPS possesses excellent anti-corrosion,anti-fouling and anti-icing properties,which provides a new way to promote the application of al and its alloys.Therefore,the SLIPS is expected to be an effective way to improve the properties of al and its alloys,as well as play a role in anti-fouling and self-cleaning in construction,shipbuilding and automotive manufacturing industries,thereby expanding the practical application of al and its alloys.

关键词： Slippery surface Al alloy Anti-corrosion Anti-fouling Anti-icing

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Refill Friction Stir Spot Welding Al alloy to Copper via Pure Metallurgical Joining Mechanism

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 90-97页

作者： Zhikang Shen Yuquan Ding Wei Guo Wentao Hou Xiaochao Liu Haiyan Chen Fenjun Liu Wenya Li Adrian Gerlich School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Centre for Advance Materials Joining University of WaterlooWaterloo N2L 3G1Canada College of Energy Engineering Yulin UniversityYulin 719000China

The current investigation of refill friction stir spot welding(refill FSSW)Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfacial bonding.Compared to conventional FSSW and pinless FSSW,weld strength can be significantly improved by using this method.Nevertheless,tool wear is a critical issue during refill FSSW.In this study,defect-free al/copper dissimilar welds were successfully fabricated using refill FSSW by only plunging the tool into top Al alloy sheet.Overall,two types of continuous and ultra-thin intermetallic compounds(IMCs)layers were identified at the whole al/copper interface.also,strong evidence of melting and resolidification was observed in the localized region.The peak temperature obtained at the center of al/copper interface was 591℃,and the heating rate reached up to 916℃/s during the sleeve penetration phase.A softened weld region was produced via refill FSSW process,the hardness profile exhibited a W-shaped appearance along middle thickness of top Al alloy.The weld lap shear load was insensitive to the welding condition,whose scatter was rather small.The fracture path exclusively propagated along the IMCs layer of Cu_(9)al_(4) under the external lap shear loadings,both Cual_(2) and Cu_(9)al_(4) were detected on the fractured surface on the copper side.This research indicated that acceptable weld strength can be achieved via pure metallurgical joining mechanism,which has significant potential for the industrial applications.

关键词： Refill friction stir spot welding Al alloy Copper Interfacial microstructure Mechanical properties

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A Review of Al alloy Anodes for al-Air Batteries in Neutral and alkaline Aqueous Electrolytes

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 309-320页

作者： Pengfei Wu Shengan Wu Dan Sun Yougen Tang Haiyan Wang Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

aluminum-air(al-air) batteries are promising candidates for energy storage applications because of their high theoretical energy density and low cost.Nevertheless,their developments have been severely hindered by multiple obstacles,among which the activation and self-corrosion inhibition of al anode have been considered to be significant challenges.In neutral electrolytes,the main problem is the activation of al anode,while the self-corrosion of al anode becomes dominant in alkaline electrolytes.Considerable efforts have been devoted to overcoming the dilemma associated with the al anode.This review firstly underscores the underlying mechanisms of passivation and self-corrosion of al anode in different electrolytes.Then,specific attentions are paid to Al alloy anode,including the role of various elements and standard processing technology.Finally,general conclusions,current limitations,and future perspectives on Al alloy anode are presented.

关键词： al-air battery Al alloy Electrolyte Corrosion inhibition Activation

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Preheating-assisted solid-state friction stir repair of al-Mg-Si alloy plate at different rotational speeds

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 725-736页

作者： Hui Wang Yidi Li Ming Zhang Wei Gong Ruilin Lai Yunping Li State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Research Institute of Light alloy Central South UniversityChangsha 410083China

Additive friction stir deposition(AFSD)is a novel structural repair and manufacturing technology has become a research hotspot at home and abroad in the past five years.In this work,the microstructural evolution and mechanical performance of the al-Mg-Si alloy plate repaired by the preheating-assisted AFSD process were investigated.To evaluate the tool rotation speed and substrate preheating for repair quality,the AFSD technique was used to additively repair 5 mm depth blind holes on 6061 aluminum alloy substrates.The results showed that preheat-assisted AFSD repair significantly improved joint bonding and joint strength compared to the control non-preheat substrate condition.Moreover,increasing rotation speed was also beneficial to improve the metallurgical bonding of the interface and avoid volume defects.Under preheating conditions,the UTS and elongation were positively correlated with rotation speed.Under the process parameters of preheated substrate and tool rotation speed of 1000 r/min,defect-free specimens could be obtained accompanied by tensile fracture occurring in the substrate rather than the repaired zone.The UTS and elongation reached the maximum values of 164.2MPa and 13.4%,which are equivalent to 99.4%and 140%of the heated substrate,respectively.

关键词： additive friction stir deposition structural repair tool rotation speed Al alloy

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Influence of Sc Addition on Precipitation Behavior and Properties of al-Cu-Mg alloy

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo Wei Shuai Pan Guizhen Liao Weizhou Li Yuezhou Wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Key Laboratory of LCR Materials and Devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

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Influence of volume percentage of NanoTiB2 particles on tribological&mechanical behaviour of 6061-T6 Al alloy nano-surface composite layer prepared via friction stir process

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Defence Technology（防务技术） 2017年第1期13卷 16-21页

作者： V.Kishan Aruri Devaraju K.Prasanna Lakshmi Department of Mechanical Engineering MRCETHyderabadT.S.India Department of Mechanical Engineering SR Engineering CollegeWarangalT.S.India Department of Mechanical Engineering College of EngineeringJNTU ManthiniT.S.India

The aim of present study is to analyze the influence of volume percentage(vol.%) of nano-sized particles(TiB_2: average size is 35 nm) on microstructure, mechanical and tribological behavior of 6061-T6 Al alloy surface nano composite prepared via Friction stir process(FSP). The microstructure of the fabricated surface nanocomposites is examined using optical microscopy(OM) and scanning electron microscope(SEM) for distribution of TiB_2 nano reinforcement particles, thickness of nano composite layer formed on the aluminum alloy substrate and fracture features. The depth of surface nano composite layer is measured as 3683.82 m m along the cross section of stir zone of nano composite perpendicular to FSP. It was observed that increase in volume percentage of TiB_2 particles, the microhardness is increased up to132 Hv and it is greater than as-received Al alloy's microhardness(104 Hv). It is also observed that at 4volume percentage higher tensile properties exhibited as compared with the 2 and 8 vol. %. It is found that high wear resistance exhibited at 4 volume percentage as-compared with the 2 and 8 vol. %. The observed wear and mechanical properties are interrelated with microstructure, fractography and worn morphology.

关键词： Friction stir process Al alloy Surface nano composites Tensile Tribology

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Preparation of al–La master alloy by ultrasonic method and modification on Al alloy

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Rare Metals 2015年第7期34卷 457-462页

作者： Hong Yan Xian-Chen Song Xin Huang Department of Materials Processing Engineering School of Mechanical and Electrical EngineeringNanchang University

In this study, two kinds of al–La master alloys were prepared by ultrasonic method and ordinary mixmelting method, and both of the alloys were added into the Al alloy.Then, the microstructure of al–La master alloy and the modification effect on the Al alloy were investigated using optical microscope(OM), X-ray diffraction(XRD), scanning electron microscope(SEM), and energy disperse spectroscopy(EDS).The results show that because of ultrasonic cavitation and streaming, the grain size of al–La master alloy prepared by the ultrasonic method is refined, which distributes evenly.And, there is no gas hole,inclusion, or segregation in the al–La master alloy with aal, La, and La3al11.Furthermore, al–La master alloys show a nice modification for Al alloy, which is much better than that prepared by ordinary mix-melting method.

关键词： Rare earth La Master alloy Al alloy Ultrasonic

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The incorporation mechanism of colloidal TiOnanoparticles and their effect on properties of the coatings grown on 7075 Al alloy from silicate-based solution using plasma electrolytic oxidation

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Transactions of Nonferrous Metals Society of China 2021年

作者： Mehri Hashemzadeh Keyvan Raeissi Fakhreddin Ashrafizadeh Amin Hakimizad Monica Santamaria Yekta Mobaddel Pars Co.， Science and Technology Campus， Yazd University Department of Materials Engineering， Isfahan University of Technology Dipartimento di Ingegneria， Università di Palermo

Plasma electrolytic oxidation (PEO) was applied using a pulsed unipolar waveform to produce alO-TiOcomposite coatings from sol electrolytic solutions containing colloidal TiOnanoparticles. The sol solutions were produced by dissolving 1， 3， and 5 g·Lof potassium titanyl oxalate (PTO) in a silicate solution. Scanning electron microscopy， energy dispersive spectrometry， X-ray diffraction， and Raman spectroscopy were applied to characterize the coatings. Corrosion behavior of the coatings was investigated using polarization and impedance techniques. The results indicated that TiOenters the coating through all types of micro-discharging and is doped into the alumina phase. The higher level of TiOincorporation resulted in the decrease of surface micro-pores， while the lower incorporation showed a diverse effect. It was revealed that the higher TiOcontent made a more compact outer layer and increased the inner layer thickness of the coating. Electrochemical measurements revealed that the coating obtained from the solution containing 3 g·LPTO exhibited ～ 33 times higher corrosion performance than that obtained in the absence of PTO. The coating produced in the absence of PTO consisted of γ-alO， δ-alOand amorphous phases， while α-alOwas promoted by the presence of PTO.

关键词： Al alloy al O -TiO coating Plasma electrolytic oxidation Potassium titanyl oxalate Corrosion resistance

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Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

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Rare Metals 2020年第6期39卷 725-732页

作者： Chong-Yu Liu Guang-Biao Teng Zong-Yi Ma Li-Li Wei Wen-Biao Zhou Hong-Feng Huang Hai-Quan Qi Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Ministry of EducationGuilin University of TechnologyGuilin 541004China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China alnan aluminium Co. LtdNanning 530000China

This study investigated the effect of 0.25 wt%Sc addition on the microstructure and mechanical properties of AA 7055 alloy.The addition of Sc obviously refined the grains of AA 7055 alloy during casting,homogenizing,rolling,solution,and aging treatments due to the formation of primary and precipitate al3(Sc,Zr)phase.The recrystallization and precipitation of AA 7055 alloy were inhibited during heat treatments by Sc addition.The Sccontaining AA 7055 alloy exhibited higher thermal stability than AA 7055 alloy during homogenizing treatment,because of the grain boundary pinning effect of nano-sized al3(Sc,Zr)particles.Given its structure characteristics such as fine grains,fineη′phase,and lessηphase,AA 7055 alloy with added Sc showed good mechanical properties after aging at 120℃for 24 h,with an ultimate tensile strength(UTS)of 679 MPa and elongation(EL)of 14%.This work provides an effective strategy to fabricate alZn-Mg(-Cu)series(7 xxx)alloys with excellent mechanical properties.

关键词： Al alloy Sc addition Microstructure Mechanical properties

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Effects of Weaving Laser on Weld Microstructure and Crack for al 6k21-T4 alloy

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Journal of Materials Science & Technology 2011年第1期27卷 93-96页

作者： B.H.Kim N.H.Kang W.T.Oh C.H.Kim J.H.Kim Y.S.Kim Y.H.Park Department of Materials Science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining Technology Team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area Technology Service KITECHJisa-dongGanseo-guBusan 618-230Korea

For al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear laser.For the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion line.However,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave part.Therefore,the continuity of cracks and porosities played a key role to determine the strength.And,the weaving width was also the important parameter to control the strength.Furthermore,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（HAZ）,respectively,than the convex part.

关键词： Weaving laser Weld microstructure Void Al alloy

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