Growth rate effects on the formation of dislocation loops around deep helium bubbles in Tungsten

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Fusion Science and Technology

DOI:https://doi.org/10.13182/FST16-116· OSTI ID:1334150

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

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, the growth process of spherical helium bubbles located 6 nm below a (100) surface is studied using molecular dynamics and parallel replica dynamics simulations, over growth rates from 10⁶ to 10¹² helium atoms per second. Slower growth rates lead to a release of pressure and lower helium content as compared with fast growth cases. In addition, at slower growth rates, helium bubbles are not decorated by multiple dislocation loops, as these tend to merge or emit given sufficient time. At faster rates, dislocation loops nucleate faster than they can emit, leading to a more complicated dislocation structure around the bubble.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC). Advanced Scientific Computing Research (ASCR) (SC-21)
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1334150
• Report Number(s): LA-UR-16-21485; TRN: US1700132
• Journal Information: Fusion Science and Technology, Vol. 71, Issue 1; ISSN 1536-1055
• Publisher: American Nuclear Society
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
Material Science
Magnetic Fusion Energy