Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa
The microstructure evolution and precipitation behavior of a multi-component β titanium alloy (namely TB17) were investigated through various characterization methods. The results show that with the increase of the solution temperature, the coarse lamellar α phase (αl) and fine secondary α phase (αs...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422018038 |
| _version_ | 1811292981431369728 |
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| author | Xing Li Xinnan Wang Ke Liu Jiayu Wang Xuan Guo Mingbing Li Zhishou Zhu Sujun Wu |
| author_facet | Xing Li Xinnan Wang Ke Liu Jiayu Wang Xuan Guo Mingbing Li Zhishou Zhu Sujun Wu |
| author_sort | Xing Li |
| collection | DOAJ |
| description | The microstructure evolution and precipitation behavior of a multi-component β titanium alloy (namely TB17) were investigated through various characterization methods. The results show that with the increase of the solution temperature, the coarse lamellar α phase (αl) and fine secondary α phase (αs) existed in the original as-forged TB17 alloy decrease. At the same time, the molybdenum equivalent value of the β matrix also decreases gradually, leading to the increase of αs phase during the following aging process. For the aged samples, the micro-strain accumulated in the β matrix resulted from phase transformation strain exhibits an increasing trend as the solution treatment temperature rises, highly depending on the volume fraction of αs phase. When the alloy is subjected to a solution treatment at temperature of 805 °C plus aging, it can achieve a good combination of high strength of 1375 MPa and considerable ductility due to mixed microstructure of suitable amount of micro-scale αl and nano-scale αs precipitates. The strength is further improved by increasing the solution temperature (from α+β to β field), which is attributed to higher volume fraction of fine αs precipitates formed during aging that can effectively hinder dislocation slip and induce micro-strain. Morphological features of the fracture surfaces are also discussed against the different microstructural morphologies, revealing the fracture mechanism of TB17 alloy under different heat treatment conditions. The current work could contribute to a better understanding of phase transformation behavior and strengthening mechanism in TB17 alloy. |
| first_indexed | 2024-04-13T04:54:34Z |
| format | Article |
| id | doaj.art-9b57aab2075444ddae14c4626da65939 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-13T04:54:34Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-9b57aab2075444ddae14c4626da659392022-12-22T03:01:34ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012148604875Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPaXing Li0Xinnan Wang1Ke Liu2Jiayu Wang3Xuan Guo4Mingbing Li5Zhishou Zhu6Sujun Wu7School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; Titanium Alloys Laboratory, Beijing Institute of Aeronautical Material, Beijing, 100095, ChinaTitanium Alloys Laboratory, Beijing Institute of Aeronautical Material, Beijing, 100095, ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, ChinaSchool of Materials Science and Engineering, Beihang University, Beijing, 100191, ChinaTitanium Alloys Laboratory, Beijing Institute of Aeronautical Material, Beijing, 100095, ChinaTitanium Alloys Laboratory, Beijing Institute of Aeronautical Material, Beijing, 100095, China; Corresponding author.School of Materials Science and Engineering, Beihang University, Beijing, 100191, China; Corresponding author.The microstructure evolution and precipitation behavior of a multi-component β titanium alloy (namely TB17) were investigated through various characterization methods. The results show that with the increase of the solution temperature, the coarse lamellar α phase (αl) and fine secondary α phase (αs) existed in the original as-forged TB17 alloy decrease. At the same time, the molybdenum equivalent value of the β matrix also decreases gradually, leading to the increase of αs phase during the following aging process. For the aged samples, the micro-strain accumulated in the β matrix resulted from phase transformation strain exhibits an increasing trend as the solution treatment temperature rises, highly depending on the volume fraction of αs phase. When the alloy is subjected to a solution treatment at temperature of 805 °C plus aging, it can achieve a good combination of high strength of 1375 MPa and considerable ductility due to mixed microstructure of suitable amount of micro-scale αl and nano-scale αs precipitates. The strength is further improved by increasing the solution temperature (from α+β to β field), which is attributed to higher volume fraction of fine αs precipitates formed during aging that can effectively hinder dislocation slip and induce micro-strain. Morphological features of the fracture surfaces are also discussed against the different microstructural morphologies, revealing the fracture mechanism of TB17 alloy under different heat treatment conditions. The current work could contribute to a better understanding of phase transformation behavior and strengthening mechanism in TB17 alloy.http://www.sciencedirect.com/science/article/pii/S2238785422018038β-Ti alloyMicrostructure evolutionPrecipitation behaviorMechanical propertyStrengthening mechanism |
| spellingShingle | Xing Li Xinnan Wang Ke Liu Jiayu Wang Xuan Guo Mingbing Li Zhishou Zhu Sujun Wu Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa Journal of Materials Research and Technology β-Ti alloy Microstructure evolution Precipitation behavior Mechanical property Strengthening mechanism |
| title | Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa |
| title_full | Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa |
| title_fullStr | Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa |
| title_full_unstemmed | Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa |
| title_short | Microstructure evolution and mechanical property of a new multi-component β titanium alloy with ultrahigh strength above 1350 MPa |
| title_sort | microstructure evolution and mechanical property of a new multi component β titanium alloy with ultrahigh strength above 1350 mpa |
| topic | β-Ti alloy Microstructure evolution Precipitation behavior Mechanical property Strengthening mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422018038 |
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