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Influence of Production Sequence of aluminum alloy Hot Rolling on Strip Surface Quality

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第1期2卷 12-14页

作者： Hui Song Weixuan Jiang College of Materials and Metallurgy Wuhan University of Science and Technology

With the intensification of market competition in the aluminum alloy strip processing industry,it is dif-ficult to control the mass production of the same specifications,which is bound to affect the hot rolling *** paper studied the effect of the hot rolling order of aluminum alloy on the surface quality of strip,such as roll printing,color difference,anodic oxidation,etc.,reasonable discharge sequence and corresponding optimization measures were formulated.

关键词： hot rolling production sequence surface quality aluminum alloy chromate treatment

Influence of Non-Natural Ageing Temperature on the Microstructural Characteristics and Mechanical Properties of Cast aluminum 6063 alloy

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Journal of Minerals and Materials Characterization and Engineering 2024年第2期12卷 91-99页

作者： Oluwole Oladele Ayodele Adedeke Olajesu Olanrewaju Samuel Olusunle Department of Metallurgical and Materials Engineering Federal University of Technology Akure Ondo State Nigeria Engineering Materials Development Institute NASENI Akure Ondo State Nigeria Department of Materials Science and Engineering Iowa State University Ames IA USA NASENI Abuja Nigeria

This research considered the effect of non-natural aging on the microstructural characteristics and mechanical properties of as-cast aluminum 6063 alloys. The samples were developed through a sand casting process and machined into tensile and impact test samples before carrying out solution heat treatment at 550?C (0.83 Tm) on two parts of the samples while retaining one part as the control. The two parts were further divided into sets denoted A and B and were aged at 180?C (0.27 Tm) and 160?C (0.24 Tm), respectively, for 12 hours. The results showed that sample A has the optimal yield strength and ultimate tensile strength of 192 and 206 MPa, respectively. Likewise, the sample gave the highest impact strength value of about 9.63 J/mm2. The observed results were supported by the optical micrograph, which revealed that the sample has evenly dispersed precipitates in its microstructure. This is deemed responsible for the observed increase in strength of the sample.

关键词： aluminum alloy Non-Natural Ageing Mechanical Properties Microstructural Features

Static recovery of A5083 aluminum alloy after a small deformation through various measuring approaches

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Journal of Materials Science & Technology 2022年第9期104卷 202-213页

作者： Sheng Ding Jingwei Zhang Sabrina Alam Khan Jun Yanagimoto Department of Mechanical Engineering The University of TokyoHongo 7-3-1Bunkyo CityTokyo 113-8656Japan

Static recovery was confirmed to be the dominant softening mechanism during annealing for the studied A5083 aluminum *** kinetics of static recovery,described based on the activation parameters(activation energy and volume of static recovery)and the static softening fraction,were mainly studied through two thermomechanical tests,namely,double-pass compression and stress relaxation tests.A new approach was proposed to measure the static softening fraction in the stress relaxation *** general,a higher temperature or strain rate accelerates static recovery,while interestingly,the effect of pre-strain on static recovery is opposite in cases with and without external stress,owing to the enhanced static recovery by external stress during *** addition,microhardness tests and electron backscatter diffraction(EBSD)characterization were also conducted to verify the accuracy of the *** grain average misorientation approach based on EBSD characterization was confirmed to be effective in distinguishing and quantifying static *** is noteworthy that the special stress hardening phenomenon occurring at 400℃and 0.1/s is caused by strain aging,showing the complexity of the material behaviors after deformation of the studied aluminum alloy.

关键词： aluminum alloy Static recovery Double-pass compression test Stress relaxation test Electron backscatter diffraction(EBSD) Grain average misorientation

Tailoring precipitation/properties and related mechanisms for a high-strength aluminum alloy plate via low-temperature retrogression and re-aging processes

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Journal of Materials Science & Technology 2022年第25期120卷 15-35页

作者： L.G.Hou H.Yu Y.W.Wang L.You Z.B.He C.M.Wu D.G.Eskin L.Katgerman L.Z.Zhuang J.S.Zhang State Key Laboratory for Advanced Metals&Materials University of Science&Technology BeijingBeijing 100083China BCAST Brunel University LondonKingston LaneUxbidge Middlesex UB83PHUnited Kingdom Institute of mineral resources Chinese Academy of Geological SciencesBeijing 100037China Nanjing Advanced Transportation Equipment New Technology Research Institute Nanjing 211800China Tomsk State University Tomsk634050Russian Federation Katgerman Aluminium Technology van Beuningenlaan 102334CC LeidenNetherlands Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628CD Delftthe Netherlands

The retrogression and re-aging(RRA)processes,aimed mainly at tailoring intergranular precipitates,could significantly improve the corrosion resistance(i.e.,stress corrosion cracking resistance)without considerably decreasing the strength,which signifies that an efficient control of the size,distribution and evolution of intergranular and intragranular precipitates becomes critical for the integrated properties of the(mid-)thick high-strength Al alloy *** to RRA process with retrogression at200℃ (T77),this study investigated the impact of a modified RRA process(MT77)with lower retrogression temperatures(155-175℃ )and first-stage under-aging on the properties of a high-strength AA7050 Al alloy,in combination with detailed precipitate *** study showed that the strength/microhardness of the RRA-treated alloys decreased with raising retrogression temperature and/or prolonging retrogression time,along with the increased electrical *** rapid responsiveness of microstructure/property typical of retrogression at 200℃ was obviously postponed or decreased by using MT77 process with longer retrogression time that was more suitable for treating the(mid-)thick *** the other hand,higher retrogression temperature facilitated more intragranularηprecipitates,coarse intergranular precipitates and wide precipitate free zones,which prominently increased the electrical conductivity alongside a considerable strength loss as compared to the MT77-treated *** the preferred MT77 process,the high strength approaching T6 level as well as good corrosion resistance was ***,though a relatively homogeneous through-thickness strength was obtained,some small discrepancies of properties between the central and surface areas of an 86-mm thick 7050 Al alloy plate were observed,possibly related to the quenching *** precipitate evolution and mechanistic connection to the properties were discussed and reviewed for high-strengt

关键词： aluminum alloy Heat treatment Precipitation Strength Grain boundary

Friction self-piercing riveting(F-SPR)of aluminum alloy to magnesium alloy using a flat die

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Journal of Magnesium and alloys 2022年第5期10卷 1207-1219页

作者： Bingxin Yang Yunwu Ma He Shan Sizhe Niu Yongbing Li Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240PR China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

Friction self-piercing riveting(F-SPR)process based on a pip die has been invented to solve the cracking problems in riveting high-strength and low-ductility light metals,such as magnesium alloys,cast aluminum,and 7 series aluminum *** this paper,in order to solve quality issues caused by the misalignment between rivet and pip-die in F-SPR,a flat-die based F-SPR process was proposed and employed to join 1.27 mm-thick AA6061-T6 to 3 mm-thick *** results indicate that a 1.0 mm die distance is effective to avoid rivet upset and insufficient *** the feed rate increases,the heat input in the whole process decreases,resulting in a larger riveting force,which in turn increases both the bottom thickness and interlock ***,solid-state bonding,including Al-Mg intermetallic compounds(IMCs),Al-Mg mechanical mixture,and Al-Fe atom interdiffusion was observed at the joint *** upper Al layer was softened,but the lower Mg layer was hardened,and both sheets exhibited a narrowed affected region with the increase of feed rate,while the rivet hardness shows no obvious *** fracture modes appeared accompanying the variations in lap-shear strength and energy absorption as the feed rate increased from 2 mm/s to 8 mm/***,the F-SPR process using a flat die was compared to those using a pip die and a flat bottom die to show the advantage of flat die on coping with the misalignment problem.

关键词： Friction self-piercing riveting(F-SPR) Flat die aluminum alloy Magnesium alloy Mechanical joining Solid-state bonding

Drawing-upsetting-extrusion-clinching of high-strength steel and aluminum alloy

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Journal of Iron and Steel Research(International) 2023年第10期30卷 1974-1986页

作者： Ling-feng Luo Shang-yu Huang Mei Yang Jian-hua Hu Bing Ou School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070HubeiChina Hubei Engineering Research Center for Green Precision Material Forming Wuhan University of TechnologyWuhan 430070HubeiChina Shanghai Technician School Shanghai 200437China

To realize good point connection between high-strength steel and aluminum alloy,a process of drawing-upsetting-extrusion-clinching was ***,the sheets were drawn;then,the bottom of the protrusion part was extruded,forming the necessary initial interlock;and finally,the protrusion part was reverse press clinched,forming a certain height of the clinched *** DP980 high-strength steel and A15083 aluminum alloy as the connection objects and using the method of numerical simulation combined with experimental test,the mold was made,and the experiment was carried out on the basis of numerical *** experimental results proved the feasibility of the process and the effectiveness of the numerical *** simulation and experimental results show that the necessary interlock in the drawing-upsetting-extrusion stage is the premise of effective *** relative protrusion height should be around 55.6%after *** best comprehensive mechanical properties measured by strength test were shear resistance of 2644 N,fatigue life of 24,535 times and peel resistance of 1522 *** failure analysis,the relationship between the interlock Tu and the neck thickness Tn of the joint with the best comprehensive mechanical properties was established as Tu=*** design method of die and process parameters when the sheet thickness changes was researched by numerical *** results show that the clearance between the punch and the die and the bottom thickness are directly proportional to the sheet thickness,and the drawing depth is directly proportional to the punch radius.

关键词： Clinching High-strength steel aluminum alloy Process parameter Joint strength

Improvement of microstructure and fatigue performance of wire-arc additive manufacture d 4043 aluminum alloy assiste d by interlayer friction stir processing

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Journal of Materials Science & Technology 2023年第2期133卷 183-194页

作者： Changshu He Jingxun Wei Ying Li Zhiqiang Zhang Ni Tian Gaowu Qin Liang Zuo School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

To expand the application of wire-arc additive manufacturing(WAAM)in aluminum alloy forming com-ponents,it is vitally important to reduce the porosity,refine microstructure,and thereby improve the mechanical properties of the *** this study,the interlayer friction stir processing(FSP)tech-nique was employed to assist the WAAM of 4043 Al-Si alloy,and the related effects on the microstruc-ture evolutions and mechanical properties of the fabricated builds were systematacially *** compared to the conventional WAAM processing of Al-Si alloy,it was found that the introduction of in-terlayer FSP can effectively eliminate the pores,and both theα-Al dendrites and Si-rich eutectic network were severely broken up,leading to a remarkable enhancement in ductility and fatigue *** average yield strength(YS)and ultimate tensile strength(UTS)of the Al-based components produced by the combination of WAAM and interlayer FSP methods were 88 and 148 MPa,***,the elongation(EL)of 37.5%and 28.8%can be achieved in the horizontal and vertical directions,*** anisotropy of EL was attributed to the inhomogeneous microstructure in the stir zone(SZ).Notably,the stress concentration can be effectively reduced by the elimination of porosity and Si-rich eu-tectic network fragmentation by the interlayer FSP,and thus the fatigue behavior was improved with the fatigue strength and elongation increased by∼28%and∼108.7%,*** is anticipated that this study will provide a powerful strategy and theoretical guidance for the WAAM fabrication of Al-based alloy components with high ductility and fatigue performance.

关键词： Wire-arc additive manufacturing(WAAM) Friction stir processing(FSP) aluminum alloy Microstructure evolution Fatigue performance

Advances and challenges on springback control for creep age forming of aluminum alloy

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Chinese Journal of Aeronautics 2022年第10期35卷 8-34页

作者： Liwen ZHANG Heng LI Tianjun BIAN Changhui WU Yang GAO Chao LEI Taicang Yangtze River Delta Research Institute of NPU Northwestern Polytechnical UniversityTaicang 215400China State Key Lab of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Shanghai Aerospace Equipments Manufacturer Co. Ltd.Shanghai 200245China School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China

Creep age forming(CAF)is an advanced forming technology that combines creep deformation and age hardening *** compared with the conventional forming technologies including roll bending and shot-peen forming,CAF has many advantages of low residual stress,excellent dimensional stability,good service performance and short production *** is an optimal technique for precise manufacturing for shape and properties of large-scale complicated thinwalled components of light-weight and high strength aluminum alloys in the aviation and aerospace ***,CAF has an inevitable disadvantage that a large amount of springback occurs after unloading,which brings a challenge on the accurate shape forming and property tailoring of ***,how to achieve accurate prediction and control of springback has always been a bottleneck hindering the development of CAF to more industrial *** the factors of affecting springback and measures of reducing springback are summarized from the internal and external aspects,constitutive models for predicting springback and springback compensation methods for CAF of aluminum alloy panel components are ***,a review of research progresses on tool design for CAF is ***,in view of the key issue that it is difficult to predict and control the shape and properties of components during CAF,the technical challenges are discussed and future development trends of CAF are prospected.

关键词： aluminum alloy Creep age forming Integrated manufacturing Springback compensation Tool design

Texture evolution prediction of 2219 aluminum alloy sheet under hydro-bulging using cross-scale numerical modeling

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Journal of Materials Science & Technology 2023年第18期149卷 190-204页

作者： Yanbo Pei Yonggang Hao Jie Zhao Jiantong Yang Bugang Teng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China

A simultaneous prediction of macroscopic deformation and microstructure evolution is critical for un-derstanding the deformation mechanism of *** this work,the hydro-bulging process of 2219 aluminum alloy sheet was investigated using cross-scale numerical modeling,in which the macroscopic finite element method(FEM)and crystal plasticity finite element method(CPFEM)were *** calculated texture evolution exhibits good agreement with the experimental results,and the stress er-ror between the two scales is generally *** effects of different strain states on texture evolution and slip mode are further *** the strain ratioηincreases,the volume fractions of the initial Rotated Copper texture component andγ-Fiber texture component decrease significantly,which tend to be stabilized at P texture *** initial Rotated Cube texture component is inclined to rotate towards the Cube texture component,while the volume fraction of this orientation is relatively *** lower strain ratio can considerably enhance the activity of more equivalent slip systems,promoting a more uniform strain distribution over *** difficulty of grain deformation changes as the lat-tice *** grain with easy-to-deform orientation can gradually rotate to a stable orientation during plastic deformation,which has a lower Schmid factor.

关键词： Cross-scale modeling Crystal plasticity Texture evolution aluminum alloy Hydro-bulging forming