TY - JOUR
T1 - Formation and evolution of MnNi clusters in neutron irradiated dilute Fe alloys modelled by a first principle-based AKMC method
AU - Ngayam-Happy, Raoul
AU - Becquart, Charlotte
AU - Domain, Christophe
AU - Malerba, Lorenzo
A2 - Castin, Nicolas
N1 - Score = 10
PY - 2012/5
Y1 - 2012/5
N2 - An atomistic Monte Carlo model parameterised on electronic structure calculations data has been used to study the formation and evolution under irradiation of solute clusters in Fe–MnNi ternary and Fe–CuMnNi quaternary alloys. Two populations of solute rich clusters have been observed, which
can be discriminated by whether or not the solute atoms are associated with self-interstitial clusters. Mn–Ni-rich clusters are observed at a very early stage of the irradiation in both modelled alloys, whereas the quaternary alloys contain also Cu-containing clusters. Mn–Ni-rich clusters nucleate very early via a
self-interstitial-driven mechanism, earlier than Cu-rich clusters; the latter, however, which are likely to form via a vacancy-driven mechanism, grow in number much faster than the former, helped by the thermodynamic driving force to Cu precipitation in Fe, thereby becoming dominant in the low dose
regime. The kinetics of the number density increase of the two populations is thus significantly different. Finally the main conclusion suggested by this work is that the so-called late blooming phases might as well be neither late, nor phases.
AB - An atomistic Monte Carlo model parameterised on electronic structure calculations data has been used to study the formation and evolution under irradiation of solute clusters in Fe–MnNi ternary and Fe–CuMnNi quaternary alloys. Two populations of solute rich clusters have been observed, which
can be discriminated by whether or not the solute atoms are associated with self-interstitial clusters. Mn–Ni-rich clusters are observed at a very early stage of the irradiation in both modelled alloys, whereas the quaternary alloys contain also Cu-containing clusters. Mn–Ni-rich clusters nucleate very early via a
self-interstitial-driven mechanism, earlier than Cu-rich clusters; the latter, however, which are likely to form via a vacancy-driven mechanism, grow in number much faster than the former, helped by the thermodynamic driving force to Cu precipitation in Fe, thereby becoming dominant in the low dose
regime. The kinetics of the number density increase of the two populations is thus significantly different. Finally the main conclusion suggested by this work is that the so-called late blooming phases might as well be neither late, nor phases.
KW - late blooming phases
KW - atomistic kinetic Monte Carlo
KW - RPV steels
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_121005
UR - http://knowledgecentre.sckcen.be/so2/bibref/9054
U2 - 10.1016/j.jnucmat.2012.03.033
DO - 10.1016/j.jnucmat.2012.03.033
M3 - Article
SN - 0022-3115
VL - 426
SP - 198
EP - 207
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -