Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments
Near-alpha titanium alloys are widely used in aeroengine blades due to their excellent specific strength and mechanical properties. The mechanical properties of near-α titanium alloys are closely related to the evolution of the microstructure and precipitates. In this paper, the microstructure and m...
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MDPI AG
2023-07-01
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| Online Access: | https://www.mdpi.com/2075-4701/13/7/1231 |
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| author | Jingyu Han Zhilei Xiang Xiaozhao Ma Zongyi Zhou Jingcun Huang Jihao Li Andong Wang Gaoliang Shen Ziyong Chen |
| author_facet | Jingyu Han Zhilei Xiang Xiaozhao Ma Zongyi Zhou Jingcun Huang Jihao Li Andong Wang Gaoliang Shen Ziyong Chen |
| author_sort | Jingyu Han |
| collection | DOAJ |
| description | Near-alpha titanium alloys are widely used in aeroengine blades due to their excellent specific strength and mechanical properties. The mechanical properties of near-α titanium alloys are closely related to the evolution of the microstructure and precipitates. In this paper, the microstructure and mechanical properties of a new type of multi-component near-α titanium alloy sheet after rolling, 700 °C aging, and 800 °C aging were studied. The results show that the strength of the alloy after aging at 700 °C increases from 1156 MPa to 1304 MPa, respectively, but decreases to 1246 MPa with the aging temperature increasing. The ductility of the alloy aged at 700 °C is lower than that of the rolled state, but the ductility increases slightly with the aging temperature increasing. The effect of aging heat treatment on the microstructure and precipitation behavior of alloy plates has been studied and compared with alloys before aging. After heat treatment, the content of primary α decreases from 25% to 5%, respectively. Two kinds of silicide precipitate at different positions, with the large-size spherical silicide being (Ti, Zr, Nb)<sub>5</sub>Si<sub>3</sub>, and the small-size fusiform silicide being (Ti, Zr, Nb)<sub>6</sub>Si<sub>3</sub>, respectively. Ti<sub>3</sub>Al was precipitated in the primary α phase, during the aging process. The silicides exhibit the strengthening effect on the alloy, but the effect weakens when the silicides grow up. The loss in ductility is mainly attributed to the precipitation of the α<sub>2</sub> phase after aging treatment. However, ductility is improved after applying higher aging temperatures as the size of the α<sub>2</sub> phase becomes smaller, and the distribution of them tends to become dispersed. |
| first_indexed | 2024-03-11T00:49:45Z |
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| last_indexed | 2024-03-11T00:49:45Z |
| publishDate | 2023-07-01 |
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| series | Metals |
| spelling | doaj.art-54b60fbca3a1491e976ade54f882b9fc2023-11-18T20:29:46ZengMDPI AGMetals2075-47012023-07-01137123110.3390/met13071231Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat TreatmentsJingyu Han0Zhilei Xiang1Xiaozhao Ma2Zongyi Zhou3Jingcun Huang4Jihao Li5Andong Wang6Gaoliang Shen7Ziyong Chen8College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaAVIC Manufacture Technology Institute (MTI), Beijing 100024, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaNear-alpha titanium alloys are widely used in aeroengine blades due to their excellent specific strength and mechanical properties. The mechanical properties of near-α titanium alloys are closely related to the evolution of the microstructure and precipitates. In this paper, the microstructure and mechanical properties of a new type of multi-component near-α titanium alloy sheet after rolling, 700 °C aging, and 800 °C aging were studied. The results show that the strength of the alloy after aging at 700 °C increases from 1156 MPa to 1304 MPa, respectively, but decreases to 1246 MPa with the aging temperature increasing. The ductility of the alloy aged at 700 °C is lower than that of the rolled state, but the ductility increases slightly with the aging temperature increasing. The effect of aging heat treatment on the microstructure and precipitation behavior of alloy plates has been studied and compared with alloys before aging. After heat treatment, the content of primary α decreases from 25% to 5%, respectively. Two kinds of silicide precipitate at different positions, with the large-size spherical silicide being (Ti, Zr, Nb)<sub>5</sub>Si<sub>3</sub>, and the small-size fusiform silicide being (Ti, Zr, Nb)<sub>6</sub>Si<sub>3</sub>, respectively. Ti<sub>3</sub>Al was precipitated in the primary α phase, during the aging process. The silicides exhibit the strengthening effect on the alloy, but the effect weakens when the silicides grow up. The loss in ductility is mainly attributed to the precipitation of the α<sub>2</sub> phase after aging treatment. However, ductility is improved after applying higher aging temperatures as the size of the α<sub>2</sub> phase becomes smaller, and the distribution of them tends to become dispersed.https://www.mdpi.com/2075-4701/13/7/1231near-α high-temperature titanium alloymicrostructureheat treatmentsilicidesα<sub>2</sub> phase |
| spellingShingle | Jingyu Han Zhilei Xiang Xiaozhao Ma Zongyi Zhou Jingcun Huang Jihao Li Andong Wang Gaoliang Shen Ziyong Chen Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments Metals near-α high-temperature titanium alloy microstructure heat treatment silicides α<sub>2</sub> phase |
| title | Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments |
| title_full | Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments |
| title_fullStr | Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments |
| title_full_unstemmed | Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments |
| title_short | Evolution on the Microstructure and Mechanical Properties of a New Multicomponent Near-Alpha Titanium Alloy after Rolling and Heat Treatments |
| title_sort | evolution on the microstructure and mechanical properties of a new multicomponent near alpha titanium alloy after rolling and heat treatments |
| topic | near-α high-temperature titanium alloy microstructure heat treatment silicides α<sub>2</sub> phase |
| url | https://www.mdpi.com/2075-4701/13/7/1231 |
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