Behavior of a self-interstitial-atom type dislocation loop in the periphery of an edge dislocation in BCC-Fe

Hayakawa, Sho; Okita, Tsuyoshi; Itakura, Mitsuhiro; Aichi, Masaatsu; Fujita, Satoshi; Suzuki, Katsuyuki

doi:10.1016/j.nme.2016.08.011

Cited by 8 publications

(3 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…Parameters in these theories were obtained by comparisons with experimental results [9,10,11,12] or atomistic simulations [12,14]. Using models within this loop dynamics framework, self-climb assisted coalescence and coarsening of prismatic loops were simulated and the results of the former were compared with those of experiments [12]; behavior of a selfinterstitial dislocation loop near an edge dislocation in BCC-Fe was studied [14,15]; spatial ordering of nano-dislocation loops in ion-irradiated materials was investigated by Langevin dynamics simulations of interacting dislocation loops [13]. A recent molecular dynamics simulations of nanoindentation showed that half prismatic edge dislocation loops annihilate via pipe diffusion of vacancies from the free surface [16].…”

Section: Introductionmentioning

confidence: 99%

“…These authors showed that two nearby prismatic loops of order 10nm in iron at 750K coalesce after a time of order 10s in both results of their atomistic self-climb model and experiment, and it is six orders of magnitude faster than the time predicted by using bulk vacancy diffusion assisted climb. Such self-climb (conservative climb) motion of dislocations plays critical roles in the properties of irradiated materials and has been an active research topic ever since it was first observed in 1960's [2,6,7,8,9,10,11,3,5,12,13,14,15]. Available quantitative theories in the literature of the self-climb of dislocation loops are all based on the dynamics of small circular loops whose shape do not change during the evolution, and the dynamics of each circular loop is driven by the interaction for between the loop and an external stress gradient following a linearly mobility relation [9,6,10,11,12,14].…”

Section: Introductionmentioning

confidence: 99%

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Dislocation dynamics formulation for self-climb of dislocation loops by vacancy pipe diffusion

Niu

Xiang

2019

International Journal of Plasticity

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It has been shown in experiments that self-climb of prismatic dislocation loops by pipe diffusion plays important roles in their dynamical behaviors, e.g., coarsening of prismatic loops upon annealing, as well as the physical and mechanical properties of materials with irradiation. In this paper, we show that this dislocation dynamics self-climb formulation that we derived in Ref.[1] is able to quantitatively describe the properties of self-climb of prismatic loops that were observed in experiments and atomistic simulations. This dislocation dynamics formulation applies to self-climb by pipe diffusion for any configurations of dislocations, and is able to recover the available models in the literature for rigid self-climb motion of small prismatic loops. We also present DDD implementation method of this selfclimb formulation. Simulations performed show evolution, translation and coalescence of prismatic loops as well as prismatic loops driven by an edge dislocation by self-climb motion and the elastic interaction between them. These results are in excellent agreement with available experimental and atomistic results. We have also performed systematic analyses of the behaviors of a prismatic loop under the elastic interaction with an infinite, straight edge dislocation by motions of self-climb and glide.

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