Research output: Contribution to journal › Article
Edge dislocations as sinks for sub-nanometric radiation induced defects in alpha-iron. / Anento, Napoleon; Malerba, Lorenzo; Serra, Anna.
In: Journal of Nuclear Materials, Vol. 498, 03.01.2018, p. 341-347.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Edge dislocations as sinks for sub-nanometric radiation induced defects in alpha-iron
AU - Anento, Napoleon
AU - Malerba, Lorenzo
AU - Serra, Anna
N1 - Score=10
PY - 2018/1/3
Y1 - 2018/1/3
N2 - The role of edge dislocations as sinks for small radiation induced defects in bcc-Fe is investigated by means of atomistic computer simulation. In this work we investigate by Molecular Statics (T ¼ 0K) the interaction between an immobile dislocation line and defect clusters of small sizes invisible experimentally. The study highlights in particular the anisotropy of the interaction and distinguishes between absorbed and trapped defects. When the considered defect intersects the dislocation glide plane and the distance from the dislocation line to the defect is on the range between 2 nm and 4 nm, either total or partial absorption of the cluster takes place leading to the formation of jogs. Residual defects produced during partial absorption pin the dislocation. By the calculation of stress-strain curves we have assessed the strength of those residues as obstacles for the motion of the dislocation, which is reflected on the unpinning stresses and the binding energies obtained. When the defect is outside this range, but on planes close to the dislocation glide plane, instead of absorption we have observed a capture process. Finally, with a view to introducing explicitly in kinetic Monte Carlo models a sink with the shape of a dislocation line, we have summarized our findings on a table presenting the most relevant parameters, which define the interaction of the dislocation with the defects considered.
AB - The role of edge dislocations as sinks for small radiation induced defects in bcc-Fe is investigated by means of atomistic computer simulation. In this work we investigate by Molecular Statics (T ¼ 0K) the interaction between an immobile dislocation line and defect clusters of small sizes invisible experimentally. The study highlights in particular the anisotropy of the interaction and distinguishes between absorbed and trapped defects. When the considered defect intersects the dislocation glide plane and the distance from the dislocation line to the defect is on the range between 2 nm and 4 nm, either total or partial absorption of the cluster takes place leading to the formation of jogs. Residual defects produced during partial absorption pin the dislocation. By the calculation of stress-strain curves we have assessed the strength of those residues as obstacles for the motion of the dislocation, which is reflected on the unpinning stresses and the binding energies obtained. When the defect is outside this range, but on planes close to the dislocation glide plane, instead of absorption we have observed a capture process. Finally, with a view to introducing explicitly in kinetic Monte Carlo models a sink with the shape of a dislocation line, we have summarized our findings on a table presenting the most relevant parameters, which define the interaction of the dislocation with the defects considered.
KW - Point defects
KW - Edge dislocation
KW - Defect interaction
KW - Radiation damage
KW - Atomic simulation
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/35807020
U2 - 10.1016/j.jnucmat.2017.10.053
DO - 10.1016/j.jnucmat.2017.10.053
M3 - Article
VL - 498
SP - 341
EP - 347
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -
ID: 5659248