Plasticity in irradiated FeCrAl nanopillars investigated using discrete dislocation dynamics

Pachaury, Yash; Warren, George; Wharry, Janelle P.; Po, Giacomo; El-Azab, Anter

doi:10.1016/j.ijplas.2023.103676

Plasticity in irradiated FeCrAl nanopillars investigated using discrete dislocation dynamics

Journal Article · Wed Jun 14 00:00:00 EDT 2023 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2023.103676· OSTI ID:2418320

Pachaury, Yash ^[1]; Warren, George ^[2]; Wharry, Janelle P. ^[2]; Po, Giacomo ^[3]; El-Azab, Anter ^[2]

Purdue Univ., West Lafayette, IN (United States); OSTI
Purdue Univ., West Lafayette, IN (United States)
Univ. of Miami, FL (United States)

Here, in this paper, we investigate plasticity in irradiated FeCrAl nanopillars using discrete dislocation dynamics simulations (DDD), with comparisons to transmission electron microscopic (TEM) in situ tensile tests of ion- and neutron-irradiated commercial C35M FeCrAl alloy. The effects of irradiation-induced defects, such as a/2<111> and a<100> type loops and composition fluctuations representative of phase separation in irradiated FeCrAl alloys, are investigated separately as well as superposed together in simulations. We explore the effects of defects on the stress-strain behavior, specifically yield strength and hardening response, of FeCrAl nanopillars. Our simulations confirm the widely accepted fact that irradiated alloys exhibit a stress-strain response with higher yield strength as compared to unirradiated alloys. However, our DDD calculations reveal an atypical superposition of the hardening contributions due to composition inhomogeneity and irradiation loops wherein composition inhomogeneity annihilates the hardening due to irradiation loops at small scales. As a result, we observe that the yield strength in irradiated alloys, after taking into consideration the effects of both composition inhomogeneity and irradiation loops, is smaller than the yield strength of the alloys with only irradiation loops and is approximately same for the alloy with composition inhomogeneity alone. This is referred to as “destructive interference” between the hardening contributions due to composition fluctuations and irradiation loops in the paper. We also identify this destructive interference in the superposition in our parallel TEM in situ tensile tests on unirradiated, ion-irradiated, and neutron-irradiated C35M FeCrAl alloy. This destructive interference in the hardening contributions contrasts with the dispersed barrier hardening (DBH) models widely utilized by the experimental community to model the hardening contributions due to different irradiation induced defects. The effects of the loading orientations on the yield strength and hardening are investigated and the mechanisms for the hardening in irradiated FeCrAl alloys are also reported.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: NE0008758; SC0017718

OSTI ID:: 2418320

Alternate ID(s):: OSTI ID: 1986359

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 167; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Plasticity in irradiated FeCrAl nanopillars investigated using discrete dislocation dynamics

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