The thermodynamic and kinetic interactions of He interstitial clusters with bubbles in W

Perez, Danny; Sandoval, Luis; Voter, Arthur F.; Uberuaga, Blas P.

doi:10.1063/1.4951706

Title: The thermodynamic and kinetic interactions of He interstitial clusters with bubbles in W

Journal Article · Sat May 28 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4951706· OSTI ID:22596709

Perez, Danny; Sandoval, Luis; Voter, Arthur F. ^[1]; Uberuaga, Blas P. ^[2]

Theoretical Division T-1, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Materials Science and Technology MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Due to its enviable properties, tungsten is a leading candidate plasma facing material in nuclear fusion reactors. However, like many other metals, tungsten is known to be affected by the high doses of helium atoms incoming from the plasma. Indeed, the implanted interstitial helium atoms cluster together and, upon reaching a critical cluster size, convert into substitutional nanoscale He bubbles. These bubbles then grow by absorbing further interstitial clusters from the matrix. This process can lead to deleterious changes in microstructure, degradation of mechanical properties, and contamination of the plasma. In order to better understand the growth process, we use traditional and accelerated molecular dynamics simulations to investigate the interactions between interstitial He clusters and pre-existing bubbles. These interactions are characterized in terms of thermodynamics and kinetics. We show that the proximity of the bubble leads to an enhancement of the trap mutation rate and, consequently, to the nucleation of satellite bubbles in the neighborhood of existing ones. We also uncover a number of mechanisms that can lead to the subsequent annihilation of such satellite nanobubbles.

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OSTI ID:: 22596709

Journal Information:: Journal of Applied Physics, Vol. 119, Issue 20; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979

Country of Publication:: United States

Language:: English

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Helium in-plane migration behavior on 〈1 0 0〉 symmetric tilt grain boundaries in tungsten Yang, Zhuocen; Hammond, Karl D. Journal of Physics: Condensed Matter, Vol. 30, Issue 32 https://doi.org/10.1088/1361-648X/aad0bc	journal	July 2018
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Helium flux effects on bubble growth and surface morphology in plasma-facing tungsten from large-scale molecular dynamics simulations Hammond, Karl D.; Naeger, Ian V.; Widanagamaachchi, Wathsala Nuclear Fusion, Vol. 59, Issue 6 https://doi.org/10.1088/1741-4326/ab12f6	journal	May 2019
An Overview of Recent Standard and Accelerated Molecular Dynamics Simulations of Helium Behavior in Tungsten Sandoval, Luis; Perez, Danny; Uberuaga, Blas P. Materials, Vol. 12, Issue 16 https://doi.org/10.3390/ma12162500	journal	August 2019
The mobility of small vacancy/helium complexes in tungsten and its impact on retention in fusion-relevant conditions Perez, Danny; Sandoval, Luis; Blondel, Sophie Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/s41598-017-02428-2	journal	May 2017
Theoretical Model of Helium Bubble Growth and Density in Plasma-Facing Metals Hammond, Karl D.; Maroudas, Dimitrios; Wirth, Brian D. Scientific Reports, Vol. 10, Issue 1 https://doi.org/10.1038/s41598-020-58581-8	journal	February 2020

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71 CLASSICAL AND QUANTUM MECHANICS
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Title: The thermodynamic and kinetic interactions of He interstitial clusters with bubbles in W

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