Diffusion and interaction of prismatic dislocation loops simulated by stochasticdiscrete dislocation dynamics

Body-centered cubic metals and alloys irradiated by energetic particles form highly mobile prismaticdislocation loops with a/2█ █-type Burgers vectors. We show how to simulate thermal diffusion of prismaticloops using a discrete dislocation dynamics approach that explicitly includes the stochastic f...

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Bibliographic Details
Published in:Physical review materials 2019, Vol.3
Main Authors: Yang, Li, Boleininger, Max, Robertson, Christian, Dupuy, Laurent, Dudarev, Sergei
Format: Article
Language:English
Subjects:
Engineering Sciences
Physics
Online Access:Get full text
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Summary:Body-centered cubic metals and alloys irradiated by energetic particles form highly mobile prismaticdislocation loops with a/2█ █-type Burgers vectors. We show how to simulate thermal diffusion of prismaticloops using a discrete dislocation dynamics approach that explicitly includes the stochastic forces associated withambient thermal fluctuations. We find that the interplay between stochastic thermal forces and internal degreesof freedom of loops, in particular the reorientation of the loop habit planes, strongly influences the observed loopdynamics. The loops exhibit three fundamental types of reactions: coalescence, repulsion, and confinement byelastic forces. The confinement reactions are highly sensitive to the internal degrees of freedom of the loops.Depending on the orientation of the loop habit planes, the barrier to enter an elastically confined bound state islowered substantially, whereas the lifetime of the bound state increases by many orders of magnitude.
ISSN:2475-9953
DOI:10.1103/PhysRevMaterials.3.073805