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Advanced Powder Materials 2023年第3期2卷 77-87页

作者： Xuan Luo Tao Song Feng Wang Haizhou Lu Limei Kang Hongwei Ma Dongdong Li annett gebert Chao Yang National Engineering Research Center of Near-net-shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Institute for Complex Materials Leibniz Institute for Solid State and Materials Research Dresden01069DresdenGermany Guangzhou Railway Polytechnic Guangzhou 510430China

The morphology and distribution of silicides inα/αþβtype titanium alloys impress on their ***,the types of silicide precipitates and their formation mechanisms remain unclear inβ-type Ti–Nb–Zr–Ta *** this study,we report the precipitation behavior of silicides formed upon aging treatment of a laser powder bed fusion(LPBF)-fabricatedβ-type Ti–34.5Nb–6.9Zr–4.9Ta–1.4Si(wt%,TNZTS)*** further discuss their underlying formation mechanism and silicide selection-oriented mechanical properties tailoring for LPBF-fabricated TNZTS *** novel silicide precipitates were formed:a supersaturated Si–richβ–Ti matrix in the form of a network that can further transform into the(Ti,Zr)2Si(S2)phase with the increase of aging temperature;and a short,rod-like S2 precipitate adjacent to pre-existing dot-shaped *** former results from the aggregation of Si solute atoms towards to the dislocation walls/microbands and the subsequent precipitation reaction,while the latter arises from the considerable micro-strain around the phase boundary between the dotshaped S2 andβ-Ti owing to the large difference in their thermal expansion coefﬁ*** aging-treated TNZTS alloy exhibits a good combination of tensile strength(10835 MPa)and fracture strain(5.6%1.0%),which is attributed to precipitation strengthening,grain-boundary strengthening,and discontinuous intergranular silicide derived from phase *** obtained results provide a basis for the design and fabrication of biomedical Sicontainingβ-type Ti alloys with excellent mechanical properties.

关键词： Laser powder bed fusion β-type titanium alloys Silicide precipitates Microstructure Mechanical propertie

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