High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C
This study systematically investigated the high cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C through scanning electron microscope and transmission electron microscope. The results showed that high temperature deteriorated the fatigue perform...
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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/S2238785422016295 |
| _version_ | 1811198718986158080 |
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| author | Wen Yu Yajun Yin Jianxin Zhou Wen Li Jiabin Zuo Junpin Lin Xin Feng |
| author_facet | Wen Yu Yajun Yin Jianxin Zhou Wen Li Jiabin Zuo Junpin Lin Xin Feng |
| author_sort | Wen Yu |
| collection | DOAJ |
| description | This study systematically investigated the high cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C through scanning electron microscope and transmission electron microscope. The results showed that high temperature deteriorated the fatigue performances, especially under the higher stress levels. Large scatter in fatigue lifetimes under the lower stress levels was observed at high temperature. After 107 cycles, the high cycle fatigue limit at 700 °C was about 20 MPa lower than that at room temperature. Fracture morphologies showed that brittle fracture presented at both temperatures and fatigue cracks initiated from the surfaces. Fracture modes at room temperature included trans-lamellar and trans-γ grain fractures, while those at 700 °C included trans-lamellar, interlamellar and inter-γ gain fractures. Fatigue deformation at both temperatures mainly occurred in the γ phase, dislocation multiplication and slip bands were found in the deformation microstructures. Dislocation slip was the main deformation mechanism at both temperatures. A few mechanical twins were observed in the deformation microstructures of room temperature. Slip bands and mechanical twins transferred through γ/γ true-twin interfaces with a deflection while they transferred through γ/γ rotational boundaries straightly. Mechanical twins had a blocking effect on slip bands, resulting in the dislocation arrays in slip bands piling up at the intersections. |
| first_indexed | 2024-04-12T01:35:00Z |
| format | Article |
| id | doaj.art-2e5434eff2144bd2bfc2a55b00df6b73 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-12T01:35:00Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-2e5434eff2144bd2bfc2a55b00df6b732022-12-22T03:53:20ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012126422652High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °CWen Yu0Yajun Yin1Jianxin Zhou2Wen Li3Jiabin Zuo4Junpin Lin5Xin Feng6State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China; Cast Titanium Alloy R&D Center, Beijing Institute of Aeronautical Materials, Beijing, 100095, ChinaState Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China; Corresponding author.State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, ChinaState Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, ChinaCast Titanium Alloy R&D Center, Beijing Institute of Aeronautical Materials, Beijing, 100095, China; Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing, 100095, China; Beijing Institute of Aeronautical Materials Co., Ltd., Beijing, 100094, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, ChinaCast Titanium Alloy R&D Center, Beijing Institute of Aeronautical Materials, Beijing, 100095, China; Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing, 100095, China; Beijing Institute of Aeronautical Materials Co., Ltd., Beijing, 100094, China; Corresponding author.This study systematically investigated the high cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C through scanning electron microscope and transmission electron microscope. The results showed that high temperature deteriorated the fatigue performances, especially under the higher stress levels. Large scatter in fatigue lifetimes under the lower stress levels was observed at high temperature. After 107 cycles, the high cycle fatigue limit at 700 °C was about 20 MPa lower than that at room temperature. Fracture morphologies showed that brittle fracture presented at both temperatures and fatigue cracks initiated from the surfaces. Fracture modes at room temperature included trans-lamellar and trans-γ grain fractures, while those at 700 °C included trans-lamellar, interlamellar and inter-γ gain fractures. Fatigue deformation at both temperatures mainly occurred in the γ phase, dislocation multiplication and slip bands were found in the deformation microstructures. Dislocation slip was the main deformation mechanism at both temperatures. A few mechanical twins were observed in the deformation microstructures of room temperature. Slip bands and mechanical twins transferred through γ/γ true-twin interfaces with a deflection while they transferred through γ/γ rotational boundaries straightly. Mechanical twins had a blocking effect on slip bands, resulting in the dislocation arrays in slip bands piling up at the intersections.http://www.sciencedirect.com/science/article/pii/S2238785422016295TiAl alloyFatigue behaviorsFractureDeformation structureHigh temperature |
| spellingShingle | Wen Yu Yajun Yin Jianxin Zhou Wen Li Jiabin Zuo Junpin Lin Xin Feng High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C Journal of Materials Research and Technology TiAl alloy Fatigue behaviors Fracture Deformation structure High temperature |
| title | High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C |
| title_full | High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C |
| title_fullStr | High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C |
| title_full_unstemmed | High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C |
| title_short | High cycle fatigue behaviors and deformation mechanisms in Ti47Al2Cr2Nb alloy at room temperature and 700 °C |
| title_sort | high cycle fatigue behaviors and deformation mechanisms in ti47al2cr2nb alloy at room temperature and 700 °c |
| topic | TiAl alloy Fatigue behaviors Fracture Deformation structure High temperature |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422016295 |
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