Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion
The morphology and distribution of silicides in α/α+β type titanium alloys impress on their properties. Nevertheless, the types of silicide precipitates and their formation mechanisms remain unclear in β-type Ti–Nb–Zr–Ta alloys. In this study, we report the precipitation behavior of silicides formed...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2023-07-01
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| Series: | Advanced Powder Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772834X23000106 |
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| author | Xuan Luo Tao Song Feng Wang Haizhou Lu Limei Kang Hongwei Ma Dongdong Li Annett Gebert Chao Yang |
| author_facet | Xuan Luo Tao Song Feng Wang Haizhou Lu Limei Kang Hongwei Ma Dongdong Li Annett Gebert Chao Yang |
| author_sort | Xuan Luo |
| collection | DOAJ |
| description | The morphology and distribution of silicides in α/α+β type titanium alloys impress on their properties. Nevertheless, the types of silicide precipitates and their formation mechanisms remain unclear in β-type Ti–Nb–Zr–Ta alloys. In this study, we report the precipitation behavior of silicides formed upon aging treatment of a laser powder bed fusion (LPBF)-fabricated β-type Ti–34.5Nb–6.9Zr–4.9Ta–1.4Si (wt%, TNZTS) alloy. We further discuss their underlying formation mechanism and silicide selection-oriented mechanical properties tailoring for LPBF-fabricated TNZTS alloy. Two novel silicide precipitates were formed: a supersaturated Si–rich β–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 S2. The 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 dot-shaped S2 and β-Ti owing to the large difference in their thermal expansion coefficients. The aging-treated TNZTS alloy exhibits a good combination of tensile strength (1083 ± 5 MPa) and fracture strain (5.6% ± 1.0%), which is attributed to precipitation strengthening, grain-boundary strengthening, and discontinuous intergranular silicide derived from phase selection. The obtained results provide a basis for the design and fabrication of biomedical Si-containing β-type Ti alloys with excellent mechanical properties. |
| first_indexed | 2024-03-13T01:19:59Z |
| format | Article |
| id | doaj.art-fddcc33a7e2f4e8ba5ceb13d509654f7 |
| institution | Directory Open Access Journal |
| issn | 2772-834X |
| language | English |
| last_indexed | 2024-03-13T01:19:59Z |
| publishDate | 2023-07-01 |
| publisher | KeAi Communications Co. Ltd. |
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| series | Advanced Powder Materials |
| spelling | doaj.art-fddcc33a7e2f4e8ba5ceb13d509654f72023-07-05T05:17:27ZengKeAi Communications Co. Ltd.Advanced Powder Materials2772-834X2023-07-0123100118Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusionXuan Luo0Tao Song1Feng Wang2Haizhou Lu3Limei Kang4Hongwei Ma5Dongdong Li6Annett Gebert7Chao Yang8National Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, ChinaNational Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, ChinaNational Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, ChinaNational Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, ChinaGuangzhou Railway Polytechnic, Guangzhou 510430, ChinaNational Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, ChinaState Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China; Corresponding author.Institute for Complex Materials, Leibniz Institute for Solid State and Materials Research Dresden, 01069, Dresden, GermanyNational Engineering Research Center of Near-net-shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China; Corresponding author.The morphology and distribution of silicides in α/α+β type titanium alloys impress on their properties. Nevertheless, the types of silicide precipitates and their formation mechanisms remain unclear in β-type Ti–Nb–Zr–Ta alloys. In this study, we report the precipitation behavior of silicides formed upon aging treatment of a laser powder bed fusion (LPBF)-fabricated β-type Ti–34.5Nb–6.9Zr–4.9Ta–1.4Si (wt%, TNZTS) alloy. We further discuss their underlying formation mechanism and silicide selection-oriented mechanical properties tailoring for LPBF-fabricated TNZTS alloy. Two novel silicide precipitates were formed: a supersaturated Si–rich β–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 S2. The 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 dot-shaped S2 and β-Ti owing to the large difference in their thermal expansion coefficients. The aging-treated TNZTS alloy exhibits a good combination of tensile strength (1083 ± 5 MPa) and fracture strain (5.6% ± 1.0%), which is attributed to precipitation strengthening, grain-boundary strengthening, and discontinuous intergranular silicide derived from phase selection. The obtained results provide a basis for the design and fabrication of biomedical Si-containing β-type Ti alloys with excellent mechanical properties.http://www.sciencedirect.com/science/article/pii/S2772834X23000106Laser powder bed fusionβ-type titanium alloysSilicide precipitatesMicrostructureMechanical properties |
| spellingShingle | Xuan Luo Tao Song Feng Wang Haizhou Lu Limei Kang Hongwei Ma Dongdong Li Annett Gebert Chao Yang Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion Advanced Powder Materials Laser powder bed fusion β-type titanium alloys Silicide precipitates Microstructure Mechanical properties |
| title | Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion |
| title_full | Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion |
| title_fullStr | Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion |
| title_full_unstemmed | Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion |
| title_short | Phase selection-oriented mechanical properties tailoring for β-type TiNbZrTaSi alloy fabricated by laser powder bed fusion |
| title_sort | phase selection oriented mechanical properties tailoring for β type tinbzrtasi alloy fabricated by laser powder bed fusion |
| topic | Laser powder bed fusion β-type titanium alloys Silicide precipitates Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2772834X23000106 |
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