Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations

Yu, Ziang; Xu, Haixuan

doi:10.1038/s43246-023-00356-5

Title: Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations

Journal Article · Sat May 06 00:00:00 EDT 2023 · Communications Materials

DOI:https://doi.org/10.1038/s43246-023-00356-5· OSTI ID:1972741

Yu, Ziang;

Abstract Dislocation loops are ubiquitous in irradiated materials, and dislocation loop bias plays a critical role in void swelling. However, due to complicated interactions between dislocation loops and point defects, it is challenging to evaluate the bias factors of dislocation loops. Here, we determine the bias of sessile < 100 > loops in α-iron using a recently developed atomistic approach based on the lifetime of point defects. We establish a mechanistic understanding of the loop interaction based on the diffusion tendency of point defects near the loop core region. Mobile self-interstitial atoms tend to be absorbed from the edge of the loop, and a trapping region perpendicular to the habit plane of the loop exists. The dislocation loop bias is found to be substantially lower than those of straight dislocations in α-iron and should be included in swelling rate estimates. With the obtained sink strength and bias values, agreement is achieved with experimental results for both absolute values and temperature dependence.

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Sponsoring Organization:: USDOE

OSTI ID:: 1972741

Journal Information:: Communications Materials, Journal Name: Communications Materials Vol. 4 Journal Issue: 1; ISSN 2662-4443

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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