An origin of corrosion resistance changes of Zr alloys: effects of Sn and Nb on grain boundary strength of surface oxide
| Autor: | Jingxiang Xu, Mei-Yi Yao, Tong Li, Bang-Xin Zhou, Chen-Hao Xu, Rong Yuan, Yao-Ping Xie, Haibo Guo |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Cladding (metalworking) Materials science Polymers and Plastics Nuclear fuel Metallurgy Metals and Alloys Oxide 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials Corrosion chemistry.chemical_compound chemistry 0103 physical sciences Ceramics and Composites Cohesion (geology) Grain boundary 0210 nano-technology Surface oxide |
| Zdroj: | Acta Materialia. 209:116804 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2021.116804 |
| Popis: | As nuclear fuel cladding, Zr alloys have need for a good corrosion resistance. For decades, several generations of Zr alloys with excellent corrosion resistance have been developed through adjusting content of Sn and Nb. However, the mechanism of Sn and Nb influencing the corrosion resistance is still not clear. Here, our computational simulations indicate, Sn or Nb can segregate at grain boundary (GB) of surface oxide film which results in variation of GB cohesion and influences the corrosion resistance. Using the first-principles method, we find that Sn segregation reduce GB cohesion and decrease oxide film protectiveness; In contrast, Nb segregation enhance GB cohesion and improve oxide film protectiveness. The results are well consistent with the previous experiments that reducing Sn or adding Nb can promote corrosion resistance of Zr alloys. These findings provide a basis for understanding the roles of alloying elements in the corrosion resistance of Zr alloys, which is useful to future design of new Zr alloys. |
| Databáze: | OpenAIRE |
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