Publication Date:
2015-02-25
Description:
Atomic scale computer simulations using density functional theory were used to investigate the behaviour of tin in the tetragonal phase oxide layer on Zr-based alloys. The S n Z r × defect was shown to be dominant across most oxygen partial pressures, with S n Z r ″ charge compensated by V O • • occurring at partial pressures below 10 −31 atm. Insertion of additional positive charge into the system was shown to significantly increase the critical partial pressure at which S n Z r ″ is stable. Recently developed low-Sn nuclear fuel cladding alloys have demonstrated an improved corrosion resistance and a delayed transition compared to Sn-containing alloys, such as Zircaloy-4. The interaction between the positive charge and the tin defect is discussed in the context of alloying additions, such as niobium and their influence on corrosion of cladding alloys.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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