Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures
A high Nb-containing TiAl alloy Ti-45Al-8.5Nb-(W, B, Y) with nearly lamellar microstructure has been irradiated by 200 kV He<sup>2+</sup> to a fluence of 1 × 10<sup>21</sup> ions/m<sup>2</sup> with a dose of about 1.1 dpa at 298 K and 773 K in this work. It is fou...
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MDPI AG
2022-02-01
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| author | Zeen Wu Tiebang Zhang Fan Zhang Rui Hu Xiaoye Wang |
| author_facet | Zeen Wu Tiebang Zhang Fan Zhang Rui Hu Xiaoye Wang |
| author_sort | Zeen Wu |
| collection | DOAJ |
| description | A high Nb-containing TiAl alloy Ti-45Al-8.5Nb-(W, B, Y) with nearly lamellar microstructure has been irradiated by 200 kV He<sup>2+</sup> to a fluence of 1 × 10<sup>21</sup> ions/m<sup>2</sup> with a dose of about 1.1 dpa at 298 K and 773 K in this work. It is found that an amorphous layer formed on the surface, and no helium bubbles can be observed in the alloy after room temperature ion implantation. The surface roughness of the alloy increases significantly with the bombardment of helium ions, indicating that the ion implantation increases the surface defects. The high-temperature ion implantation leads to the phenomenon of blistering on the alloy surface, and helium bubbles are observed in both α<sub>2</sub> and γ phases of the alloy irradiated at 773 K. The average size of the helium bubbles in the α<sub>2</sub> (15~20 nm) is larger than that in the γ (3~5 nm) phase, while the helium bubble density is opposite. Moreover, the growth mechanism of helium bubble is also investigated. By means of nanoindentation, an obvious irradiation hardening phenomenon is measured after the room temperature ion implantation. In addition, the irradiation sensitivity of different phases is also discussed in this work. The results show that the γ phase has the highest irradiation sensitivity, α<sub>2</sub> phase second, β phase minimum. The results of this work, especially microstructure evolution and the evaluation of phase-related irradiation sensitivity during ion implantation, can be expected to provide experimental evidence for the applications of TiAl intermetallic compounds in the nuclear industries. |
| first_indexed | 2024-03-09T21:25:27Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T21:25:27Z |
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| spelling | doaj.art-2f06b07a1ca4442b80ccc7b040d513bf2023-11-23T21:08:47ZengMDPI AGMetals2075-47012022-02-0112233510.3390/met12020335Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated TemperaturesZeen Wu0Tiebang Zhang1Fan Zhang2Rui Hu3Xiaoye Wang4Shannxi Province Key Laboratory of Advanced Manufacturing and Evaluation of Robot Key Components, Baoji University of Arts and Sciences, Baoji 721016, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, ChinaShannxi Province Key Laboratory of Advanced Manufacturing and Evaluation of Robot Key Components, Baoji University of Arts and Sciences, Baoji 721016, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, ChinaShannxi Province Key Laboratory of Advanced Manufacturing and Evaluation of Robot Key Components, Baoji University of Arts and Sciences, Baoji 721016, ChinaA high Nb-containing TiAl alloy Ti-45Al-8.5Nb-(W, B, Y) with nearly lamellar microstructure has been irradiated by 200 kV He<sup>2+</sup> to a fluence of 1 × 10<sup>21</sup> ions/m<sup>2</sup> with a dose of about 1.1 dpa at 298 K and 773 K in this work. It is found that an amorphous layer formed on the surface, and no helium bubbles can be observed in the alloy after room temperature ion implantation. The surface roughness of the alloy increases significantly with the bombardment of helium ions, indicating that the ion implantation increases the surface defects. The high-temperature ion implantation leads to the phenomenon of blistering on the alloy surface, and helium bubbles are observed in both α<sub>2</sub> and γ phases of the alloy irradiated at 773 K. The average size of the helium bubbles in the α<sub>2</sub> (15~20 nm) is larger than that in the γ (3~5 nm) phase, while the helium bubble density is opposite. Moreover, the growth mechanism of helium bubble is also investigated. By means of nanoindentation, an obvious irradiation hardening phenomenon is measured after the room temperature ion implantation. In addition, the irradiation sensitivity of different phases is also discussed in this work. The results show that the γ phase has the highest irradiation sensitivity, α<sub>2</sub> phase second, β phase minimum. The results of this work, especially microstructure evolution and the evaluation of phase-related irradiation sensitivity during ion implantation, can be expected to provide experimental evidence for the applications of TiAl intermetallic compounds in the nuclear industries.https://www.mdpi.com/2075-4701/12/2/335high Nb-containing TiAlradiation damagemicrostructural evolutionnanohardnessirradiation sensitivity |
| spellingShingle | Zeen Wu Tiebang Zhang Fan Zhang Rui Hu Xiaoye Wang Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures Metals high Nb-containing TiAl radiation damage microstructural evolution nanohardness irradiation sensitivity |
| title | Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures |
| title_full | Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures |
| title_fullStr | Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures |
| title_full_unstemmed | Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures |
| title_short | Microstructural Evolution and the Irradiation Sensitivity of Different Phases of a High Nb-Containing TiAl Alloy under He Ions Implantation at Room- and Elevated Temperatures |
| title_sort | microstructural evolution and the irradiation sensitivity of different phases of a high nb containing tial alloy under he ions implantation at room and elevated temperatures |
| topic | high Nb-containing TiAl radiation damage microstructural evolution nanohardness irradiation sensitivity |
| url | https://www.mdpi.com/2075-4701/12/2/335 |
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