| Autor: |
Liu, Ye, Lin, Zunmin, He, Shuang, Zhang, Lin, Chen, Xu, Tan, Qiankun, Gorbatov, Oleg I., Peng, Ping, Qu, Xuanhui |
| Zdroj: |
Journal of Materials Research and Technology; March-April 2024, Vol. 29 Issue: 1 p1872-1886, 15p |
| Abstrakt: |
Oxides play a crucial role in shaping various properties in ferritic alloys under Helium environment. This study investigates the thermodynamic and mechanical properties of Y4Zr3O12and Y2Ti2O7oxides in ferritic alloys with and without Helium utilizing a systematic first-principles approach. Firstly, the atomic arrangement of Y and Zr atoms at cation 18fsites in δ-(Y–Zr–O) oxide is identified, while it is found that Y4Zr3O12exhibits a more robust formation tendency than Y2Ti2O7. Furthermore, it is noted that both Y4Zr3O12and Y2Ti2O7oxides demonstrate a prior ability to trap Helium compared to the bcc-Fe matrix, which leads to a substantial enhancement on the stiffness of both oxides. The elastic moduli of both Y4Zr3O12and Y2Ti2O7oxide exhibit a gradual increase with the growing Helium concentration. As a result, the enhanced shear modulus of oxides and sustained shear modulus of the bcc-Fe matrix collectively contribute to the overall strength of ferritic alloys under Helium environments. The findings in this work propose valuable insights for guiding critical strategies in the design of high-performance oxide-dispersion-strengthened ferritic alloys, particularly for applications in Helium environments. |
| Databáze: |
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