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Kinetics of the Nucleation and Growth of Helium Bubbles in bcc Iron

Published online by Cambridge University Press:  01 February 2011

Chaitanya Suresh Deo ,
Srinivasan G. Srivilliputhur ,
Michael Baskes ,
Stuart Maloy ,
Michael James ,
Maria Okuniewski  and
James Stubbins
Chaitanya Suresh Deo
Affiliation:
cdeo@lanl.gov, Los Alamos National Laboratory, MST-8, PO Box 1663, MS G755, Los Alamos NAtional Laboratory, Los Alamos, NM, 87545, United States, 505-667-1755
Srinivasan G. Srivilliputhur
Affiliation:
sgsrini@lanl.gov, Los Alamos National Laboratory, Los Alamos, 87545, United States
Michael Baskes
Affiliation:
baskes@lanl.gov, Los Alamos National Laboratory, Los Alamos, 87545, United States
Stuart Maloy
Affiliation:
maloy@lanl.gov, Los Alamos National Laboratory, Los Alamos, 87545, United States
Michael James
Affiliation:
mrjames@lanl.gov, Los Alamos National Laboratory, Los Alamos, 87545, United States
Maria Okuniewski
Affiliation:
okuniews@uiuc.edu, University of Illinois, Urbana, 61801, United States
James Stubbins
Affiliation:
jstubbin@uiuc.edu, University of Illinois, Urbana, 61801, United States
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Abstract

Microstructural defects are introduced in materials upon irradiation with energetic particles. These defects can cause degradation of mechanical properties and contribute to material failure. Transmuted helium in irradiated stainless steels exerts deleterious effects on material properties. We have performed kinetic Monte Carlo (kMC) simulations of point defect diffusion and clustering in bcc alpha iron. The model includes helium and vacancy diffusion and spontaneous clustering and dissociation of the point defects from the clusters. We employ the kMC simulations to investigate the time evolution of the point defect configuration leading to defect clustering and bubble formation. The concentration of embryonic point defect clusters is determined as a function of the simulation time.

Keywords

kineticsradiation effectsHe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 929: Symposium II – Materials in Extreme Environments , 2006 , 0929-II01-08
Copyright
Copyright © Materials Research Society 2006

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