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Microstructure and mechanical properties of 600 MPa grade ultra-high strength aluminum alloy fabricated by wire-arc additive manufacturing

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Journal of Materials Science & Technology 2023年第18期149卷 56-66页

作者： Xinpeng Guo Huijun Li Peng Xue Zengxi Pan Rongzheng Xu dingrui ni Zongyi Ma School of Mechanical Materialsand Mechatronics and Biomedical EngineeringUniversity of WollongongWollongongNSW 2522Australia Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shenyang Aerospace UniversityShenyang 110136China

The utilization of wire-arc additive manufacturing(WAAM)technology for the preparation of Al-Zn-Mg-Cu aluminum alloy has made some progress in recent ***,the challenge still remains to achieve ultra-high strength(600 MPa)in *** this study,the crack-free Al-Zn-Mg-Cu-Sc thin-wall component with ultra-high strength was successfully fabricated by the cold metal transfer(CMT)pro-cess using a self-prepared 7B55-Sc filler *** microstructures of both as-deposited and T6 heat-treated samples were all composed of fine equiaxed grains with an average size of about 6.0μ*** primary Al_(3)(Sc,Zr)particles acted as heterogeneous nuclei to promote the formation of equiaxed grains and refine the microstructures during the solidification process.A large amount of continuous eutectic structures rich in Al,Zn,Mg,and Cu elements formed along the grain boundaries under the as-deposited condition,and the precipitated second phases within the grains mainly included the equilibriumηphase,metastableηphase and large-sized T *** T6 heat treatment,the majority of the second phases originally distributed within grains and along grain boundaries were dissolved into the Al matrix,and a large amount of fine GP zones,ηphase and secondary Al_(3)(Sc,Zr)particles were precipitated within the grains during the aging *** tensile strength reached a recorded level of 618 MPa in the hori-zontal direction after T6 heat treatment,which was considered a breakthrough for the manufacturing of 600 MPa grade aluminum alloy by WAAM.

关键词： Wire-arc additive manufacturing Al-Zn-Mg-Cu alloy T6 heat treatment Microstructure Second phase Mechanical property

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Wear behavior of the raw and pre-smashed carbon nanotubes reinforced 6061Al composites fabricated by powder metallurgy

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Science China(Technological Sciences) 2022年第5期65卷 1149-1159页

作者： LI XiaoNan LIU ZhenYu ZAN Yuning XIAO BoLü ni dingrui WANG QuanZhao WANG Dong MA ZongYi Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

The raw and pre-smashed(PS)carbon nanotube(CNT)reinforced 6061Al composites(CNT/6061Al)with different CNT contents were respectively fabricated by powder metallurgy *** was found that reducing the CNT cluster size by presmashing processing could sharply reduce the friction coefficient,and significantly improve the density,hardness,and wear resistance of the CNT/6061Al *** the raw-CNT/6061Al composites,the wear rate increased approximately linear trend while the CNT content was over 1 wt.%.The plastic deformation,deep grooves,and serious delamination were presented on the wear *** wear process was gradually transformed from Al-copper base counterpart wear into Al-Al wear for the higher adhesion-binding energy between aluminum and copper base *** for the PS-CNT/6061Al composites,the wear rate gradually decreased as the CNT content increased from 0 to 2 wt.%.This was mainly because the generation of the thinner mechanically mixed layer(MML)and the PS-CNT prevented the direct contact between specimen and copper base counterpart,which effectively inhibited the adhesive *** excessive PS-CNTaddition(~3 wt.%)would weaken the bonding between CNT and 6061Al,and thus the wear resistance of the composite was reduced apparently.

关键词： wear carbon nanotube aluminum matrix composites clustering

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Strengthening strategy for high-performance friction stir lap welded joints based on 5083 Al alloy

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2498-2507页

作者： Yujia Shen Jijie Wang Beibei Wang Peng Xue Fengchao Liu dingrui ni Bolv Xiao Zongyi Ma College of Material Science and Engineering Shenyang Aerospace UniversityShenyang 110136China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Binzhou Institute of Technology Shandong Key Laboratory of Advanced Aluminium Materials and TechnologyWeiqiao-UCAS Science and Technology ParkBinzhou 256606China Centre of Excellence for Advanced Materials Dongguan 523808China

During aircraft,ship,and automobile manufacturing,lap structures are frequently produced among Al alloy skins,wall panels,and *** occurrence of welding defects severely decreases mechanical properties during friction stir lap welding(FSLW).This study focuses on investigating the effects of rotation rate,multipass welding,and cooling methods on lap defect formation,microstructural evolution,and mechanical *** defects were eliminated by decreasing welding speed,applying two-pass FLSW with a small welding tool,and introducing additional water cooling,thus leading to a remarkable increase in effective sheet thickness and lap *** above strategy yielded defect-free joints with an ultrafine-grained microstructure and increased tensile shear force from 298 to 551 N/*** fracture behavior of FSLW joints was systematically studied,and a fracture factor of lap joints was proposed to predict their fracture *** reducing the rotation rate,using two-pass welding,and employing additional water cooling strategies,an enlarged,strengthened,and defect-free lap zone with refined ultrafine grains was achieved with a quality comparable to that of lap welds based on 7xxx Al ***,this study provides a valuable FSLW method for eliminating hook defects and improving joint performance.

关键词： friction stir lap welding defect control microstructure fracture mechanisms mechanical properties

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Evolution of Quasicrystals and Long-Period Stacking Ordered Structures During Severe Plastic Deformation and Mixing of Dissimilar Mg Alloys Upon Friction Stir Welding

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 12-24页

作者： Meichen Liang Hao Zhang Lifeng Zhang Peng Xue dingrui ni Weizhen Wang Zongyi Ma Hengqiang Ye Zhiqing Yang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesSchool of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Jihua Laboratory Foshan 528251China

Microstructural evolution during severe plastic deformation and mixing of Mg95.8Zn3.6Gd0.6 and Mg97Cu1Y2(at%)alloys upon friction stir welding was studied.A laminated onion-ring structure composed of alternative distribution of layers with signifi cantly refi ned microstructures from diff erent alloys was formed in the stirred *** quasicrystals were broken up and dispersed with most of them being transformed into cubic W-phase particles,and thick 18R long-period stacking ordered plates were fractured and transformed into fi ne 14H-LPSO lamellae in the stirred zone(SZ)experiencing complex material flow under high strain *** W-phase particles and 14H-LPSO lamellae formed during dissimilar friction stir welding(FSW)usually have no specifi c orientation relationship with surrounding Mg *** measurements demonstrated occurrence of interdiff usion between dissimilar layers in the *** transformation was observed for some particles of quasicrystals and long-period stacking ordered(LPSO)in regions slightly outside the *** ultimate tensile strength of~415 MPa and an elongation to failure of~27.8%,both exceeding those of base materials,were obtained in the SZ,due to microstructural refi nement and formation of a laminated structure.

关键词： Mg alloy Microstructure Phase transformation Severe plastic deformation Mechanical property

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Dual-phase synergistic deformation characteristics and strengthening mechanism of AlCoCrFeni_(2.1) eutectic high entropy alloy fabricated by laser powder bed fusion

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Journal of Materials Science & Technology 2023年第19期150卷 75-85页

作者： Xu Tang Hao Zhang Zhengwang Zhu Peng Xue Lihui Wu Fengchao Liu dingrui ni Bolv Xiao Zongyi Ma Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Eutectic high entropy alloy(EHEA)possesses promising prospects for industrial application due to its controllable and near-equilibrium dual-phase *** to the advantages of high material utiliza-tion,efficient production,and design freedom,the laser powder bed fusion(LPBF)technique provides a new path to prepare EHEA components with complex structure and excellent *** this study,near fully dense AlCoCrFeni_(2.1) samples were obtained by adjusting the process parameters of ***-sidering the balling phenomenon and powder splashing during the LPBF process,laser remelting was selected as an optimized scanning strategy to further improve the forming quality of *** microstructure of remelted AlCoCrFeni_(2.1) sample exhibited regular eutectic lamellae consisting of nano-scale face-centered-cubic(FCC)and B2 phases,in which the FCC phase accounted for a higher *** investigating the tensile behavior and deformation mechanism,it was revealed that the ultrafine eu-tectic lamellae could induce a strong dual-phase synergistic strengthening,thereby significantly improv-ing the strength of the *** with the vacuum induction melted(VIM)sample,the remelted sample showed a 54%increase in ultimate tensile strength(UTS-1518 MPa)and a 130%increase in yield strength(YS-1235 MPa)with reasonable *** study indicates that by combining the design and manufacturing freedom of LPBF with the EHEA,it is expected to fabricate high-property 3D EHEA parts,expanding the application field of EHEA.

关键词： Laser powder bed fusion Remelting Eutectic high entropy alloy Microstructure Deformation mechanism

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Enhanced Fatigue Properties of 2219 Al Alloy Joints via Bobbin Tool Friction Stir Welding

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 586-596页

作者： Zhenlin Wang Beibei Wang Zhen Zhang Peng Xue Yunfei Hao Yanhua Zhao dingrui ni Guoqing Wang Zongyi Ma Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China China Academy of Launch Vehicle Technology Beijing 100076China Capital Aerospace Machinery Company Beijing 100076China

In the present study,2219-T87 Al alloy plates,4 mm in thickness,were subjected to bobbin tool friction stir welding(BTFSW)under relatively high welding speeds of 200 and 400 mm/min,with the aim to analyze the effect of welding speeds on fatigue properties of the *** results showed that the tension–tension high-cycle fatigue performance of the BT-FSW joints at room temperature was significantly enhanced compared to that of other joints of 2xxx series Al alloys *** at a high welding speed of 400 mm/min,the fatigue strength of the joint reached 78%of the base material together with a high tensile strength of 311 *** was found that the joint line remnants had no effects on the fatigue properties of the BT-FSW joints due to the elimination of root flaws under the action of the lower *** of the samples with the welding speed of 200 mm/min failed at the thermo-mechanical zone(TMAZ)during fatigue tests,attributable to the coarsened grains and precipitates,but all of the samples with high welding speed of 400 mm/min randomly failed at the nugget zone due to the improved hardness value in the TMAZ.

关键词： 2219 Al alloys Bobbin tool friction stir welding Microstructure Fatigue properties

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Achieving a high-strength dissimilar joint of T91 heat-resistant steel to 316L stainless steel via friction stir welding

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 166-176页

作者： Zhiwei Wang Min Zhang Cong Li Fenglei niu Hao Zhang Peng Xue dingrui ni Bolv Xiao Zongyi Ma CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China Shi Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The reliable welding of T91 heat-resistant steel to 316L stainless steel is a considerable issue for ensuring the safety in service of ultrasupercritical power generation unit and nuclear fusion reactor,but the high-quality dissimilar joint of these two steels was difficult to be obtained by traditional fusion welding *** we improved the structure-property synergy in a dissimilar joint of T91 steel to 316L steel via friction stir welding.A defect-free joint with a large bonding interface was produced using a small-sized tool under a relatively high welding *** bonding interface was involved in a mixing zone with both mechanical mixing and metallurgical *** obvious material softening was detected in the joint except a negligible hardness decline of only HV~10 in the heat-affected zone of the T91 steel side due to the formation of ferrite *** welded joint exhibited an excellent ultimate tensile strength as high as that of the 316L parent metal and a greatly enhanced yield strength on account of the dependable bonding and material renovation in the weld *** work recommends a promising technique for producing high-strength weldments of dissimilar nuclear steels.

关键词： heat-resistant steel stainless steel friction stir welding dissimilar welding microstructure mechanical property

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Wear Behavior of the Uniformly Dispersed Carbon Nanotube Reinforced 6061Al Composite Fabricated by Milling Combined with Powder Metallurgy

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1765-1776页

作者： Xiaonan Li Zhenyu Liu Zhixin Dai Hui Feng Bolyu Xiao dingrui ni Quanzhao Wang Dong Wang Zongyi Ma School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The uniformly dispersed carbon nanotubes(CNTs) reinforced 6061Al composites(CNT/6061Al) with diff erent CNT concentrations were fabricated by powder metallurgy technology. It was found that the friction coe ffi cient as well as wear rate decreased fi rst and then increased as the CNT concentration increasing under 15 N as well as 30 N, and the minimum wear rate was achieved at the CNT concentration of 2 wt%. Adhesive wear and abrasive wear were the dominated wear mechanisms for the 1–2 wt% CNT/6061Al composites under 15 N and 30 N, while the delamination occurred on the wear surface at 3wt% CNT. As the applied load increased to 60 N, the wear rate of composites increased dramatically. The wear mechanism transformed from abrasive wear to severe delamination wear, accompanied by the generation of wear debris with sharp edge due to the weaker anti-shearing strain capacity of CNT/6061Al composites.

关键词： Wear mechanism Carbon nanotube Aluminum matrix composites Powder metallurgy

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Effect of grain refinement and crystallographic texture produced by friction stir processing on the biodegradation behavior of a Mg-Nd-Zn alloy

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Journal of Materials Science & Technology 2019年第5期35卷 777-783页

作者： Wen Zhang Lili Tan dingrui ni Junxiu Chen Ying-Chao Zhao Long Liu Cijun Shuai Ke Yang Andrej Atrens Ming-Chun Zhao School of Material Science and Engineering Central South University Changsha 410083 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Division of Materials The University of Queensland Brisbane Qld 4072 Australia

The application of a single pass of friction stir processing(FSP) to Mg-Nd-Zn alloy resulted in grain refinement, texture evolution and redistribution of second phases, which improved corrosion *** this work, an as-rolled Mg-Nd-Zn alloy was subjected to FSP. The microstructure in the processed zone of the FS-400 rpm alloy exhibited refined grains, a more homogenous grain size distribution, less second phases, and stronger basal plane texture. The corrosion behavior assessed using immersion tests and electrochemical tests in Hank’s solution indicated that the FS-400 rpm alloy had a lower corrosion rate, which was attributed to the increase of basal plane intensity and grain refinement. The hardness was lowered slightly and the elongation was increased, which might be attributed to the redistribution of the crushed second phases.

关键词： Mg alloy Friction stir processing Grain refinement Texture evolution Biodegradation

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镁合金搅拌摩擦焊接的研究现状与展望

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金属学报 2018年第11期54卷 1597-1617页

作者：马宗义商乔倪丁瑞肖伯律中国科学院金属研究所沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016

近年来,镁合金在汽车、轨道交通、航空航天等领域的应用需求快速增长,其可靠连接的重要性愈发突出。作为固相焊接技术,搅拌摩擦焊(FSW)对镁合金焊接具有独特优势,因此得到了广泛关注。本文重点综述了镁合金常规对接FSW的研究进展,就焊... 详细信息

近年来,镁合金在汽车、轨道交通、航空航天等领域的应用需求快速增长,其可靠连接的重要性愈发突出。作为固相焊接技术,搅拌摩擦焊(FSW)对镁合金焊接具有独特优势,因此得到了广泛关注。本文重点综述了镁合金常规对接FSW的研究进展,就焊接工艺、微观组织演化、织构分布特征、接头力学性能及其之间的相互作用机制进行了详细分析与评述。研究表明,不同于铝合金,在变形镁合金FSW时,织构是影响接头性能的关键因素,焊后形成的特殊强织构分布是导致接头难以达到与母材同等强度的主要原因。同时,对其它焊接形式如搭接焊、点焊、双面焊的可焊性及接头性能的影响因素与变化规律进行了讨论,并对镁合金与其它镁合金、铝合金以及钢之间异种焊的可焊性、界面结合机制、接头性能的影响因素及调控方法进行了评述。最后,对镁合金FSW的未来研究方向进行了展望。

关键词：镁合金搅拌摩擦焊接异种焊组织演化接头性能

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