α' formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys

Aydogan, Eda; Martinez, Enrique Saez; March, K.; El-Atwani, Osman; Krumwiede, D. L.; Hosemann, Peter; Saleh, Tarik A.; Maloy, Stuart Andrew

doi:10.1038/s41598-019-44508-5

Title: α' formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys

Journal Article · 06 June 2019 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-019-44508-5 · OSTI ID:1619714

Aydogan, Eda ^[1];

^[2]; March, K. ^[3];

^[2]; Krumwiede, D. L. ^[4]; Hosemann, Peter ^[4];

^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sabanci Univ., Istanbul (Turkey)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Arizona State Univ., Tempe, AZ (United States)
Univ. of California, Berkeley, CA (United States)

Nanostructured ferritic alloys are considered as candidates for structural components in advanced nuclear reactors due to a high density of nano-oxides (NOs) and ultrafine grain sizes. However, bimodal grain size distribution results in inhomogeneous NO distribution, or vice versa. Here, we report that density of NOs in small grains (<0.5 µm) is high while there are almost no NOs inside the large grains (>2 µm) before and after irradiation. After 6 dpa neutron irradiation at 385–430 °C, α' precipitation has been observed in these alloys; however, their size and number densities vary considerably in small and large grains. In this study, we have investigated the precipitation kinetics of α' particles based on the sink density, using both transmission electron microscopy and kinetic Monte Carlo simulations. Furthermore, it has been found that in the presence of a low sink density, α' particles form and grow faster due to the existence of a larger defect density in the matrix. On the other hand, while α' particles form far away from the sink interface when the sink size is small, Cr starts to segregate at the sink interface with the increase in the sink size. Additionally, grain boundary characteristics are found to determine the radiation-induced segregation of Cr.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1619714

Alternate ID(s):: OSTI ID: 1532729; OSTI ID: 1768518

Report Number(s):: LA-UR-19-24571; LA-UR-18-29400

Journal Information:: Scientific Reports, Vol. 9, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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