Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels
In this work, the short-term creep behaviors of high Nb containing TiAl alloys with different microstructure characteristics at 800 °C under a wide range of stresses of 150–350 MPa were investigated in detail. In order to tailor microstructure of high Nb containing TiAl alloys, composition design st...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423011973 |
| _version_ | 1797745267428032512 |
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| author | Zhenquan Liang Shulong Xiao Yi Shao Dazhao Chi Xinyi Li Yunfei Zheng Lijuan Xu Xiang Xue Jing Tian Yuyong Chen |
| author_facet | Zhenquan Liang Shulong Xiao Yi Shao Dazhao Chi Xinyi Li Yunfei Zheng Lijuan Xu Xiang Xue Jing Tian Yuyong Chen |
| author_sort | Zhenquan Liang |
| collection | DOAJ |
| description | In this work, the short-term creep behaviors of high Nb containing TiAl alloys with different microstructure characteristics at 800 °C under a wide range of stresses of 150–350 MPa were investigated in detail. In order to tailor microstructure of high Nb containing TiAl alloys, composition design strategies were applied, including the change of Al content and the introduction of non-metallic element C and rare-earth oxide Y2O3. Microstructure analysis shows that increasing Al content from 43 at.% to 46 at.% will not only change the phase constitution by changing the solidification behavior, but also affect the existence form of element C, that is, in the form of dissolved carbon atoms in low-Al alloy and Ti2AlC precipitate in high-Al alloy. Creep results confirm that both increasing Al content and introducing C and Y2O3 can effectively reduce the steady-state creep rate and enhance the creep resistance, but the latter has a more significant effect. In addition, the creep behavior of high Nb containing TiAl alloys strongly depends on the stress level, and corresponding creep deformation mechanism changes from grain boundary/lamellar interface sliding under low stress to dislocation motion under high stress. Meanwhile, the correlation between the critical stress value on creep mechanism transition and the alloy composition/microstructure was clarified. |
| first_indexed | 2024-03-12T15:20:57Z |
| format | Article |
| id | doaj.art-8fcc1abdcd0c47d4809e1ae42c6bf288 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-12T15:20:57Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-8fcc1abdcd0c47d4809e1ae42c6bf2882023-08-11T05:32:58ZengElsevierJournal of Materials Research and Technology2238-78542023-07-0125532545Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levelsZhenquan Liang0Shulong Xiao1Yi Shao2Dazhao Chi3Xinyi Li4Yunfei Zheng5Lijuan Xu6Xiang Xue7Jing Tian8Yuyong Chen9National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China; Corresponding author.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China; Corresponding author.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China; Corresponding author.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR ChinaIn this work, the short-term creep behaviors of high Nb containing TiAl alloys with different microstructure characteristics at 800 °C under a wide range of stresses of 150–350 MPa were investigated in detail. In order to tailor microstructure of high Nb containing TiAl alloys, composition design strategies were applied, including the change of Al content and the introduction of non-metallic element C and rare-earth oxide Y2O3. Microstructure analysis shows that increasing Al content from 43 at.% to 46 at.% will not only change the phase constitution by changing the solidification behavior, but also affect the existence form of element C, that is, in the form of dissolved carbon atoms in low-Al alloy and Ti2AlC precipitate in high-Al alloy. Creep results confirm that both increasing Al content and introducing C and Y2O3 can effectively reduce the steady-state creep rate and enhance the creep resistance, but the latter has a more significant effect. In addition, the creep behavior of high Nb containing TiAl alloys strongly depends on the stress level, and corresponding creep deformation mechanism changes from grain boundary/lamellar interface sliding under low stress to dislocation motion under high stress. Meanwhile, the correlation between the critical stress value on creep mechanism transition and the alloy composition/microstructure was clarified.http://www.sciencedirect.com/science/article/pii/S2238785423011973Titanium aluminidesMicrostructureCreep behaviorStress dependence |
| spellingShingle | Zhenquan Liang Shulong Xiao Yi Shao Dazhao Chi Xinyi Li Yunfei Zheng Lijuan Xu Xiang Xue Jing Tian Yuyong Chen Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels Journal of Materials Research and Technology Titanium aluminides Microstructure Creep behavior Stress dependence |
| title | Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels |
| title_full | Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels |
| title_fullStr | Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels |
| title_full_unstemmed | Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels |
| title_short | Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels |
| title_sort | effects of tailoring microstructure on short term creep behavior of high nb containing tial alloys under various stress levels |
| topic | Titanium aluminides Microstructure Creep behavior Stress dependence |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423011973 |
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