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Defect annihilation in heavy ion irradiated polycrystalline gold

Journal Article · · Materials Letters

In this study, we explore the interaction of electron wind force (EWF) with defects originating from ion irradiation in-situ inside a transmission electron microscope. Nanocrystalline gold specimens were self-ion irradiated to a dose of 5 × 1015 ions/cm2 (45 displacement per atom) to generate a high density of displacement damage. We also developed a molecular dynamics simulation model to understand the associated atomic scale mechanisms. Both experiments and simulations show that the EWF can impart significant defect mobility even at low temperatures, resulting in the migration and elimination of defects in a few minutes. Overall, we propose that the EWF interacts with defects to create highly glissile Shockley partial dislocations, which makes the fast and low temperature defect annihilation possible.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1668698
Alternate ID(s):
OSTI ID: 1776446
Report Number(s):
SAND--2020-10069J; 690797
Journal Information:
Materials Letters, Journal Name: Materials Letters Vol. 282; ISSN 0167-577X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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