Atomic irradiation defects induced hardening model in irradiated tungsten based on molecular dynamics and CPFEM

Lin, Pan-dong; Nie, Jun-feng; Lu, Yu-peng; Shi, Chang-xin; Cui, Shu-gang; Cui, Wen-dong; He, Lei

doi:10.1016/j.ijplas.2024.103895

Cited by 8 publications

(3 citation statements)

References 121 publications

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“…Introducing Equation (26) into Equation ( 18) yields the Case 4 prediction of irradiation hardening, which is similar to Equation (25) but with a higher density of GNDs for the irradiated condition:…”

Section: Casementioning

confidence: 99%

“…The ratios of c/c i used in Equation ( 27) are summarized in Table 8, along with the corresponding ratios of the densities of GNDs. Based on the Case 2 prediction (denoted GND_0), Case 4 predictions with two different densities of GNDs for the unirradiated references, along with the densities of GNDs for the irradiated conditions according to Equation (26), have been applied. The prediction based on Equation (27) with Equations ( 23) and ( 24) are referred to as GND_3 and GND_4, respectively.…”

Section: Casementioning

confidence: 99%

“…Microstructure-informed predictions of hardening have been reported by several groups [20][21][22][23][24][25][26][27], most of them referring to the dispersed-barrier hardening (DBH) model [20,21,23]. Chen et al [21] characterized the irradiation-induced dislocation loops as a function of the distance from the surface of ion-irradiated stainless steel samples.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure-Informed Prediction of Hardening in Ion-Irradiated Reactor Pressure Vessel Steels

Lai,

Brandenburg,

Chekhonin

et al. 2024

Metals

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Ion irradiation combined with nanoindentation is a promising tool for studying irradiation-induced hardening of nuclear materials, including reactor pressure vessel (RPV) steels. For RPV steels, the major sources of hardening are nm-sized irradiation-induced dislocation loops and solute atom clusters, both representing barriers for dislocation glide. The dispersed barrier hardening (DBH) model provides a link between the irradiation-induced nanofeatures and hardening. However, a number of details of the DBH model still require consideration. These include the role of the unirradiated microstructure, the proper treatment of the indentation size effect (ISE), and the appropriate superposition rule of individual hardening contributions. In the present study, two well-characterized RPV steels, each ion-irradiated up to two different levels of displacement damage, were investigated. Dislocation loops and solute atom clusters were characterized by transmission electron microscopy and atom probe tomography, respectively. Nanoindentation with a Berkovich indenter was used to measure indentation hardness as a function of the contact depth. In the present paper, the measured hardening profiles are compared with predictions based on different DBH models. Conclusions about the appropriate superposition rule and the consideration of the ISE (in terms of geometrically necessary dislocations) are drawn.

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Section: Casementioning

confidence: 99%

Section: Casementioning

confidence: 99%