Atomic-scale mechanisms of helium bubble hardening in iron

Osetskiy, Yury N.; Stoller, Roger E.

doi:10.1016/j.jnucmat.2015.05.034

Title: Atomic-scale mechanisms of helium bubble hardening in iron

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Abstract

Generation of helium due to (n,α) transmutation reactions changes the response of structural materials to neutron irradiation. The whole process of radiation damage evolution is affected by He accumulation and leads to significant changes in the material s properties. A population of nanometric He-filled bubbles affects mechanical properties and the impact can be quite significant because of their high density. Understanding how these basic mechanisms affect mechanical properties is necessary for predicting radiation effects. In this paper we present an extensive study of the interactions between a moving edge dislocation and bubbles using atomic-scale modeling. We focus on the effect of He bubble size and He concentration inside bubbles. Thus, we found that ability of bubbles to act as an obstacle to dislocation motion is close to that of voids when the He-to-vacancy ratio is in the range from 0 to 1. A few simulations made at higher He contents demonstrated that the interaction mechanism is changed for over-pressurized bubbles and they become weaker obstacles. The results are discussed in light of post-irradiation materials testing.

Authors:

Osetskiy, Yury N. ^[1]; Stoller, Roger E. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Wed Jun 03 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1214484

Alternate Identifier(s):: OSTI ID: 1252000

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 465; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; helium embrittlement; helium bubble; radiation induced hardening; ferritic steel

Citation Formats


                    Osetskiy, Yury N., and Stoller, Roger E. Atomic-scale mechanisms of helium bubble hardening in iron.  United States: N. p., 2015. 
Web.  doi:10.1016/j.jnucmat.2015.05.034.

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                    Osetskiy, Yury N., & Stoller, Roger E. Atomic-scale mechanisms of helium bubble hardening in iron.  United States.  https://doi.org/10.1016/j.jnucmat.2015.05.034

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                    Osetskiy, Yury N., and Stoller, Roger E. Wed .  
"Atomic-scale mechanisms of helium bubble hardening in iron".  United States.  https://doi.org/10.1016/j.jnucmat.2015.05.034.  https://www.osti.gov/servlets/purl/1214484.

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@article{osti_1214484,

  title        = {Atomic-scale mechanisms of helium bubble hardening in iron},

  author       = {Osetskiy, Yury N. and Stoller, Roger E.},

  abstractNote = {Generation of helium due to (n,α) transmutation reactions changes the response of structural materials to neutron irradiation. The whole process of radiation damage evolution is affected by He accumulation and leads to significant changes in the material s properties. A population of nanometric He-filled bubbles affects mechanical properties and the impact can be quite significant because of their high density. Understanding how these basic mechanisms affect mechanical properties is necessary for predicting radiation effects. In this paper we present an extensive study of the interactions between a moving edge dislocation and bubbles using atomic-scale modeling. We focus on the effect of He bubble size and He concentration inside bubbles. Thus, we found that ability of bubbles to act as an obstacle to dislocation motion is close to that of voids when the He-to-vacancy ratio is in the range from 0 to 1. A few simulations made at higher He contents demonstrated that the interaction mechanism is changed for over-pressurized bubbles and they become weaker obstacles. The results are discussed in light of post-irradiation materials testing.},

  doi          = {10.1016/j.jnucmat.2015.05.034},

  journal      = {Journal of Nuclear Materials},

  number       = ,

  volume       = 465,

  place        = {United States},

  year         = {Wed Jun 03 00:00:00 EDT 2015},

  month        = {Wed Jun 03 00:00:00 EDT 2015}

}

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