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

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

doi:10.1063/1.4951706

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

Journal Article · Thu May 26 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4951706· OSTI ID:1414089

^[1]; Sandoval, Luis ^[1]; ^[2]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology MST-8

Due to its enviable properties, tungsten is a leading candidate plasma facing material in nuclear fusion reactors. But, 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 also 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. Finally, we uncover a number of mechanisms that can lead to the subsequent annihilation of such satellite nanobubbles.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC). Advanced Scientific Computing Research (ASCR) (SC-21)

Grant/Contract Number:: AC02-05CH11231; AC52-06NA25396

OSTI ID:: 1414089

Alternate ID(s):: OSTI ID: 22596709
OSTI ID: 1254522

Report Number(s):: LA-UR--16-22259

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 20 Vol. 119; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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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
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
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
Effect of W self-implantation and He plasma exposure on early-stage defect and bubble formation in tungsten Thompson, M.; Drummond, D.; Sullivan, J. Nuclear Fusion, Vol. 58, Issue 6 https://doi.org/10.1088/1741-4326/aab96c	journal	April 2018
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