Atomistic simulation of the influence of Cr on the mobility of the edge dislocation in Fe(Cr) alloys

In this work Fe-Cr compounds, as model alloys for the ferritic base steels that are considered as main candidates for the structural materials of the future fusion reactors, are studied using molecular dynamics simulations. The Cr or so-called alpha' precipitates, which are obstacles to dislocations, affect mechanical properties, leading to hardening and loss of ductility. The flow stress to move an edge dislocation in a Cr solid solution in pure Fe is studied as a function of Cr content. The strength of a nanometric Cr precipitate as obstacle to an edge dislocation in pure Fe is investigated as a function of its Cr content. Results show that with increasing Cr content the precipitate obstacle strength increases, with a strong sensitivity to the local atomic order. Temperature induces a monotonic decrease of the flow stress of the Cr solid solution and of the Cr precipitate obstacle strength. (C) 2011 Elsevier B.V. All rights reserved.


Published in:
Journal of Nuclear Materials, 417, 1-3, 1094-1097
Presented at:
14th International Conference on Fusion Reactor Materials (ICFRM), Sapporo, Japan, September 7-12, 2009
Year:
2011
Publisher:
Elsevier
ISSN:
0022-3115
Keywords:
Laboratories:
SPC
CRPP




 Record created 2012-05-04, last modified 2018-01-28


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