Deconvoluting the Effect of Chromium and Aluminum on the Radiation Response of Wrought FeCrAl Alloys After Low-Dose Neutron Irradiation

Massey, Caleb; Zhang, Dalong; Briggs, Samuel A.; Edmondson, Philip D.; Yamamoto, Yukinori; Gussev, Maxim N.; Field, Kevin G.

doi:10.1016/j.jnucmat.2021.152804

Cited by 18 publications

(8 citation statements)

References 35 publications

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“…Different amounts of irradiation temperature gradients for all three capsules were observed. The mean irradiation temperatures were within a reasonable range from the target irradiation temperatures except for the FCAB06 capsule where the mean irradiation temperature was approximately 40°C lower than the target irradiation temperature but still above the expected range where the alloys of interest would phase segregate into ⍺-⍺ʹ [9].…”

Section: Irradiation Conditionsmentioning

confidence: 74%

“…At the irradiation temperature of 501-507°C, both alloys showed a similar response to the high temperature irradiation, i.e., a small amount of irradiation softening with increasing irradiation doses. At 501-507°C, no Cr-rich  precipitates are expected based on the Fe-Cr and Fe-Cr-Al phase diagrams; furthermore, this irradiation temperature is above that required for dislocation loops to form [9,[11][12]. Thus, the similar unirradiated microstructures, coupled with similar alloy compositions, helps explain the close irradiation responses of these alloys at this temperature.…”

Section: Vickers Microhardnessmentioning

confidence: 90%

“…Moreover, at the irradiation temperature of 315-343°C, both alloys showed a similarly small amount of irradiation hardening which seemed to saturate for irradiation dose beyond 8 dpa. Although the microstructures of these specimens have not yet been quantified, it is expected that similar dislocation loop densities will exist [9]. At the lowest irradiation temperature of 166-204°C, both alloys showed significant irradiation hardening compared with high irradiation temperature cases, which is expected due to high densities of refined dislocation loops as seen in analogous samples irradiated to similar temperatures but at lower dose [9].…”

Section: Vickers Microhardnessmentioning

confidence: 92%

See 2 more Smart Citations

Fracture Toughness Characterization of Generation II FeCrAl Alloys after ~18 dpa Irradiation

Chen¹,

Field²,

Campbell³

et al. 2021

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Section: Irradiation Conditionsmentioning

confidence: 74%

Section: Vickers Microhardnessmentioning

confidence: 90%

Section: Vickers Microhardnessmentioning

confidence: 92%

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Fracture Toughness Characterization of Generation II FeCrAl Alloys after ~18 dpa Irradiation

Chen¹,

Field²,

Campbell³

et al. 2021

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“…Similarly, the selection of the appropriate threshold value for isoconcentration surfaces is crucial in achieving reliable quantitative precipitation analysis (Barton et al, 2019). One method that is particularly popular in Fe-Cr system is to use a combination of two techniques: cluster search to delineate the α ′ precipitates and isoconcentration surfaces based techniques like 1D profile or proximity histogram for the compositional analysis (Massey et al, 2021). This has originally been proposed by Bachhav et al (2014) as a way to minimize the uncertainty in the measurement of α ′ precipitate composition.…”

Section: Introductionmentioning

confidence: 99%

A Combinatorial Approach to Reliable Quantitative Analysis of Small Nano-Sized Precipitates: A Case Study with α′ Precipitates in Fe–20 at% Cr Alloy

Sarkar

Shinde

Sen

et al. 2022

Microscopy and Microanalysis

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The quantitative characterization of small nano-sized precipitates poses genuine challenges and is often deficient in accuracy due to the inherent limitations inevitably associated with the individual experimental techniques. A convenient solution is to utilize multiple complementary techniques. The present work demonstrates an effective way to reliably quantify nano-sized precipitates using a combination of complementary techniques of atom probe tomography (APT), small angle neutron scattering (SANS), and transmission electron microscopy (TEM). As a case study, the size (radius, r), number density (NP), volume fraction (ϕ), and chemical composition of Cr-rich α′ precipitates are determined in Fe–20 at% Cr alloy, thermally aged at 773 K for 1,000 h. This combinatorial approach utilizes the strength of each technique in such a way that the overall accuracy of quantitative precipitation analysis improves significantly. For example, the superior spatial resolution makes TEM the appropriate technique to estimate the size and size distribution of the precipitates, while APT provides the chemical composition. Similarly, SANS analysis incorporates both the size and the compositional information thus derived independently and provides statiscally averaged quantitative analysis overcoming the field-of-view limitations of both TEM and APT. This combinatorial approach improves the accuracy of quantification and provides the true representation of the microstructure.

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“…Significant experimental evidence exists which suggests that the composition fluctuations affect the mechanical behavior of the alloys [4][5][6][7][8]. Along the modeling front, the first attempt to explain the hardening in spinodally decomposed alloys was made by Cahn [9] and later followed by Kato et al [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Microplasticity in inhomogeneous alloys

Pachaury

Kumagai

El-Azab

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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We report on a preliminary modelling effort to understand the influence of compositional inhomogeneity on alloy microplasticity from a dislocation dynamics perspective. We tackle this problem by multiscale simulations in three steps: (1) analysis of the 3D composition morphology in alloys with tendency to undergo spinodal instability both thermally and under irradiation, with bcc FeCrAl alloys as a model system, (2) atomistic simulation of the dislocation mobility as a function of the local alloy composition, and (3) using dislocation dynamics simulations to understand the impact of composition inhomogeneity on microplasticity. The dislocation dynamics model takes into consideration the coherency stress associated with composition inhomogeneity when computing the forces driving the dislocation motion and on cross slip. Our preliminary investigation shows that the stress-strain response of the alloy and the dislocation density evolution depend on the wavelength of the composition fluctuations. Our investigation also shows that the alloy inhomogeneity may alter the cross-slip activity, which, in turn, influences the dislocation density evolution. The dependence of the dislocation mobility and coherency stress on local composition and its variation, as well as the altered cross slip rates, cause the dislocation microstructure to differ relative to that in the homogeneous alloy of the same average composition.

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Deconvoluting the Effect of Chromium and Aluminum on the Radiation Response of Wrought FeCrAl Alloys After Low-Dose Neutron Irradiation

Cited by 18 publications

References 35 publications

Fracture Toughness Characterization of Generation II FeCrAl Alloys after ~18 dpa Irradiation

Fracture Toughness Characterization of Generation II FeCrAl Alloys after ~18 dpa Irradiation

A Combinatorial Approach to Reliable Quantitative Analysis of Small Nano-Sized Precipitates: A Case Study with α′ Precipitates in Fe–20 at% Cr Alloy

Microplasticity in inhomogeneous alloys

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