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high strength al-cu-mg based alloy with synchronous improved tensile properties and hot-cracking resistance suitable for laser powder b e d fusion

引用

Journal of Materials Science & Technology 2023年第10期141卷 155-170页

作者： Q.Z.Wang N.Kang X.Lin M.EL Mansori W.D.Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Arts et Metiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne F-51006France Key Laboratory of Metal high Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843USA

In present work,a novel crack-free al-cu-mg-Si-Ti alloy with synchronous improved tensile properties and hot-cracking resistance was proposed and successfully manufactured by laser powder bed fusion(LPBF).The microstructure evolution behaviors and the corresponding strengthening mechanisms were investigated in *** LPBF-processed al-cu-mg-Si-Ti alloy presents a heterogeneous microstructure consisting of ultrafine equiaxed grains(UFGs)at the boundary and coarse columnar grains(CGs)at the center of the single molten ***-precipitated D022-al 3 Ti particles were found to act as the nuclei to refine the grains at the boundary of the molten pool during solidification process,which is attributed to the low cooling rate providing the sufficient incubation time for the precipitation of D022-al 3 *** are two orientation relationships(ORs)betweenα-al and D022-al 3 Ti,i.e.[001]α-al//[001]D022-al3Ti,(200)α-al//(200)D022-al3Ti and[1¯1¯2]α-al//[¯111]D022-al3Ti,(1¯11)α-al//(¯11¯2)D022-al3Ti,which are two of the eight ORs predicted with the E2EM *** grains in present alloy,no matter for UFGs or CG,exhibited high critical hot-cracking stress,which means a strong hot-cracking ***-nanoprecipitation of cu-,mg-,and Si-rich Q’and S’phases was introduced to enhance the mechanical performance ofα-al *** as-built sample exhibits superior tensile properties,with the yield strength(YS)of 473±8 MPa,ultimate tensile strength(UTS)of 541±2 MPa and elongation(EI)of 10.9%±1.2%.

关键词： Laser powder bed fusion high strength al-cu-mg alloys Duplex microstructure Precipitation Tensile properties

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