Nanoindentation Analysis of Ion Irradiated FeCrAl C26M

Technical Report · Fri Oct 12 00:00:00 EDT 2018

DOI:https://doi.org/10.2172/1477629· OSTI ID:1477629

Gigax, Jonathan Gregory ^[1]; Aydogan, Eda ^[1]; Chancey, Matthew ^[1]; Wang, Yongqiang ^[1]; Li, Nan ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The present report summarizes the irradiation hardening behavior of two FeCrAl alloys, C26M and B126Y, irradiated up to a damage level of 16 dpa. Nanoindentation values were averaged between a depth of 100 and 200 nm in order to capture the irradiated region only. At the highest damage level, C26M was measured to harden by 1.62 GPa with little change in the modulus. B126Y showed a change in hardness of up to 2.52 GPa, reaching a similar hardness to the C26M. To more accurately compare with the unirradiated material where the influence of indentation size effects may operate more strongly, the Nix-Gao model was used to calculate the hardness at infinite depth, H0, and the length scale term, h*. The change in hardness with this model was found to be lower for both C26M and B126Y. The length scale term decreased with increasing dose up to 4 dpa and then deviated from expectation with a significant i ncrease at 16 dpa for both specimens. Spherical nanoindentation was performed on all specimens. A 5 μm tip was used to ensure the yield point occurred in the irradiated region. While the results from this testing are not as conclusive at doses less than 4 dpa, the nanoindentation yield strength showed similar trends with the nanoindentation hardness data.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1477629
• Report Number(s): LA-UR-18-29702
• Country of Publication: United States
• Language: English