Journal
MATERIALS TRANSACTIONS
Volume 46, Issue 3, Pages 463-468Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.46.463
Keywords
edge dislocation; dislocation loop; molecular dynamics; hardening
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Self-interstitial atom (SIA) type dislocation loop is one of the possible candidates of the so-called matrix damage that causes hardening and embrittlement of blanket structural materials of fusion reactors and/or pressure vessel materials of light water reactors. We present in this paper molecular dynamics computer simulation results on the interactions between an edge dislocation and a SIA loop with Burgers vectors of b = a(o)/2 [1 (1) over bar1] and b = a(o)/2 [(1) over bar 11], respectively, which are introduced in bec-Fe crystal. Then shear stresses of several different magnitudes are applied so that the dislocation moves to meet the SIA loop. General observation is that the SIA loops with diameter of similar to 2 nm can be obstacles to dislocation motion, and the strength as obstacles to dislocation motion depends on applied stress. The origin of the stress dependent strength can be explained athermally using the elastic theory of dislocation interaction. In most cases, the SIA loops are absorbed by the edge dislocations to form a large super-jog after the interactions. This suggests a possibility of localized deformation of irradiated bcc-Fe due to the formation of dislocation channeling.
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