Enhanced diffusion of Cr in 20Cr-25Ni type alloys under proton irradiation at 670 °C

Journal Article · 23 October 2018 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2018.10.001 · OSTI ID:1478543

Chen, Tianyi  ^[1]; Yang, Ying  ^[2]; He, Li ^[3]; Tyburska-Püschel, Beata ^[3]; Sridharan, Kumar ^[3]; Xu, Haixuan ^[4]; Tan, Lizhen  ^[2]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Oregon State Univ., Corvallis, OR (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Univ. of Wisconsin, Madison, WI (United States)
4. Univ. of Tennessee, Knoxville, TN (United States)

Alloy 709 (Fe-20Cr-25Ni-1.5Mo-0.26Nb in weight percentages) and its model alloy (Fe-20Cr-25Ni) were subjected to 2 MeV proton irradiation up to 1.5 displacements per atom at ~670 °C for 90 h. Significant compositional changes were observed in the irradiated zone of both alloys, which was correlated with the radiation-enhanced diffusion. The radiation-enhanced diffusion coefficient of Cr was experimentally determined by fitting the Cr depletion profiles and theoretically analyzed considering vacancy-assisted lattice diffusion, dislocation pipeline diffusion, etc. The estimation of the radiation-enhanced diffusion in the 20Cr-25Ni type alloy in this study is useful in predicting its performance in radiation damage environment. In conclusion, the methodology of investigating radiation-enhanced diffusion adds to the nuclear-material screening capability of ion-irradiation technologies.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1478543
• Alternate ID(s): OSTI ID: 1479797
• Journal Information: Nuclear Materials and Energy, Vol. 17, Issue C; ISSN 2352-1791
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English