Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy
In this study, the influence of the Ti3AlC carbide morphology on the creep properties, the interaction between carbides and dislocations during creep deformation as well as the influence of external stress on carbide morphology evolution were investigated in a Ti-45Al-5Nb-0.75C alloy. The results sh...
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Elsevier
2024-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424004393 |
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| author | Xianli Cao Li Wang Hui Tao Weiwei He Xiaopeng Liang Bin Liu Michael Oehring Jonathan Paul Florian Pyczak Yong Liu |
| author_facet | Xianli Cao Li Wang Hui Tao Weiwei He Xiaopeng Liang Bin Liu Michael Oehring Jonathan Paul Florian Pyczak Yong Liu |
| author_sort | Xianli Cao |
| collection | DOAJ |
| description | In this study, the influence of the Ti3AlC carbide morphology on the creep properties, the interaction between carbides and dislocations during creep deformation as well as the influence of external stress on carbide morphology evolution were investigated in a Ti-45Al-5Nb-0.75C alloy. The results show that the best creep properties are obtained after annealing at 800 °C for 336 h. This is probably due to the splitting of the carbides into conglomerates of sub-particles, which provides an increased number of interfacial area and interfaces to hinder dislocation glide. After prolonged annealing for 1054 h at 800 °C, although the carbide splitting still existed, the matrix grains coarsened and the lamellar structure was decomposed, which counteracted the positive effect of carbide splitting and led to a reduction in the creep resistance. By comparing the carbide morphology evolution after creep and after annealing alone, it can be concluded that the external stress does not significantly affect the morphology evolution. During creep at 800 °C the Ti3AlC carbides obviously interact with dislocations, and the majority of them were identified to be ½<110] ordinary dislocations. The glide of these dislocations was strongly hindered, and thus the creep properties of the alloy can be improved by carbide precipitation. |
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| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T20:04:10Z |
| publishDate | 2024-03-01 |
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| spelling | doaj.art-0bef67d2627b4c5790a0e58f988238cf2024-03-24T06:58:29ZengElsevierJournal of Materials Research and Technology2238-78542024-03-012941814190Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloyXianli Cao0Li Wang1Hui Tao2Weiwei He3Xiaopeng Liang4Bin Liu5Michael Oehring6Jonathan Paul7Florian Pyczak8Yong Liu9State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; Corresponding author.School of Materials Science and Engineering, Central South University, Changsha, 410083, ChinaXi'an Sailong AM Technologies Co., Ltd, Xi'an, 710016, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; School of Materials Science and Engineering, Central South University, Changsha, 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaInstitute of Materials Physics, Helmholtz-Zentrum Hereon, Max-Planck-Strasse 1, Geesthacht, 21502, GermanyInstitute of Materials Physics, Helmholtz-Zentrum Hereon, Max-Planck-Strasse 1, Geesthacht, 21502, GermanyInstitute of Materials Physics, Helmholtz-Zentrum Hereon, Max-Planck-Strasse 1, Geesthacht, 21502, GermanyState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaIn this study, the influence of the Ti3AlC carbide morphology on the creep properties, the interaction between carbides and dislocations during creep deformation as well as the influence of external stress on carbide morphology evolution were investigated in a Ti-45Al-5Nb-0.75C alloy. The results show that the best creep properties are obtained after annealing at 800 °C for 336 h. This is probably due to the splitting of the carbides into conglomerates of sub-particles, which provides an increased number of interfacial area and interfaces to hinder dislocation glide. After prolonged annealing for 1054 h at 800 °C, although the carbide splitting still existed, the matrix grains coarsened and the lamellar structure was decomposed, which counteracted the positive effect of carbide splitting and led to a reduction in the creep resistance. By comparing the carbide morphology evolution after creep and after annealing alone, it can be concluded that the external stress does not significantly affect the morphology evolution. During creep at 800 °C the Ti3AlC carbides obviously interact with dislocations, and the majority of them were identified to be ½<110] ordinary dislocations. The glide of these dislocations was strongly hindered, and thus the creep properties of the alloy can be improved by carbide precipitation.http://www.sciencedirect.com/science/article/pii/S2238785424004393TiAl alloysDislocationsCarbidesTransmission electron microscopyCreep properties |
| spellingShingle | Xianli Cao Li Wang Hui Tao Weiwei He Xiaopeng Liang Bin Liu Michael Oehring Jonathan Paul Florian Pyczak Yong Liu Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy Journal of Materials Research and Technology TiAl alloys Dislocations Carbides Transmission electron microscopy Creep properties |
| title | Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy |
| title_full | Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy |
| title_fullStr | Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy |
| title_full_unstemmed | Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy |
| title_short | Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy |
| title_sort | morphology evolution of p ti3alc carbides and their influence on creep properties in a crept ti 45al 5nb 0 75c alloy |
| topic | TiAl alloys Dislocations Carbides Transmission electron microscopy Creep properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424004393 |
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