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Enhanced Strength-Ductility Synergy in Submerged Friction Stir Processing ER2319 Alloy Manufactured by wire-arc additive manufacturing via Creating Ultrafine Microstructure

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 793-807页

作者： Jinpeng Hu Tao Sun Fujun Cao Yifu Shen Zhiyuan Yang Chan Guo College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China

Submerged friction stir processing(SFSP)with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc *** a result,uniform and ultrafine grained(UFG)structure with average grain size of 0.83μm was achieved with the help of sharply reduced heat input and holding time at elevated *** optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%.Specifically,grain refinement strengthening and decentralized θ(Al_(2)Cu)phase in the sample subjected to SFSP made great contributions to the enhanced *** addition,the decrease in residual stresses and removal of pores substantially enhance the *** rates of cooling and low temperature cycling,which are facilitated by the water-cooling environment throughout the machining process,are vital in obtaining superior *** work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.

关键词： Submerged friction stir processing wire-arc additive manufacturing Al-Cu alloy Residual stress Strengthening and toughening mechanism Ultrafine grained microstructure

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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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Comparative Study on wire-arc additive manufacturing and Conventional Casting of Al–Si Alloys:Porosity,Microstructure and Mechanical Property

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 475-485页

作者： Yueling Guo Qifei Han Jinlong Hu Xinghai Yang Pengcheng Mao Junsheng Wang Shaobo Sun Zhi He Jiping Lu Changmeng Liu School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Center for Micro and Nano Technologies Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Hangxing Machinery manufacturing Co. Ltd.Beijing 100013China

Here,we compare the porosity,microstructure and mechanical property of 4047 Al–Si alloys prepared by wire-arc additive manufacturing(WAAM)and conventional casting.X-ray microscopy reveals that WAAM causes a higher volume fraction of gas pores in comparison with conventional *** refi nements ofα-Al dendrites,eutectic Si particles and Ferich intermetallic compounds are achieved by WAAM,resulting from its rapid solidifi cation *** ultimate tensile strength(UTS,up to 205.6 MPa)and yield stress(YS,up to 98.0 MPa)are improved by WAAM at the expense of elongation after *** mechanical property anisotropy between scanning direction and build direction is minimal for alloys via *** microstructure refi nement and strength enhancement are enabled by increasing the travel speed of welding torch from 300 to 420 mm/min.

关键词： wire-arc additive manufacturing Al–Si alloy Porosity Microstructure Strength

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