Coalescence dynamics of prismatic dislocation loops due to vacancy supersaturation

McElfresh, Cameron; Bertin, Nicolas; Aubry, Sylvie; Marian, Jaime

doi:10.1103/physrevmaterials.6.l100601

Coalescence dynamics of prismatic dislocation loops due to vacancy supersaturation

Journal Article · Wed Oct 05 00:00:00 EDT 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.l100601· OSTI ID:2204114

McElfresh, Cameron ^[1]; Bertin, Nicolas ^[2]; ^[2]; ^[1]

Univ. of California, Los Angeles, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Recovery processes in metals with a high defect concentration are at the heart of a structural alloy's usability in engineering applications. However, such processes take place via nonconservative mechanisms mediated by point defect diffusion and are governed by their interactions with the underlying microstructure. Indeed, one of the main challenges in studying recovery processes is their intrinsic multiscale complexity, which often negates the direct use of experimental techniques. Here, in this Research Letter, we study the mechanism of dislocation loop coalescence in metals by simulating the interaction dynamics between vacancies and prismatic loops using a stochastic framework that seamlessly bridges point defect kinetics with dislocation mechanics. Our simulations reveal two fundamental discoveries: first, that climb processes are governed by local fluctuations that are not captured by continuum elastodiffusion models, and, second, that prismatic loops create internal traps for vacancies, leading to the formation of rings around the perimeter of the loops that affect how coalescence takes place. Our results show an excellent agreement with in situ experimental observations of loop coalescence in Fe under irradiation.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC52-07NA27344; SC0019157

OSTI ID:: 2204114

Report Number(s):: LLNL--JRNL-830245; 1046616

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 10 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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