Mechanisms for interstitial dislocation loops to diffuse in BCC iron

N. Gao, Z. W. Yao (), G. H. Lu, H. Q. Deng and F. Gao ()
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N. Gao: Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), ShanDong University
Z. W. Yao: Key Laboratory of Bionic Engineering Ministry of Education, Jilin University
G. H. Lu: Beihang University
H. Q. Deng: Hunan University
F. Gao: University of Michigan

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The mobility of dislocation loops in materials is a principle factor in understanding the mechanical strength, and the evolution of microstructures due to deformation and radiation. In body-centered cubic (BCC) iron, the common belief is that interstitial dislocation loops are immobile once formed. However, using self-adaptive accelerated molecular dynamics (SSAMD), a new diffusion mechanism has been discovered for interstitial dislocation loops. The key aspect of the mechanism is the changing of the habit planes between the {100} plane and the {110} plane, which provides a path for the loops to diffuse one-dimensionally. The migration behavior modeled with SSAMD is further confirmed by in-situ transmission electron microscopy (TEM) measurements, and represents a significant step for understanding the formation of loop walls and the mechanical behavior of BCC Fe under irradiation.

Date: 2021
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DOI: 10.1038/s41467-020-20574-6

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