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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Cluster Dynamics Study of Neutron Irradiation...

Cluster Dynamics Study of Neutron Irradiation Induced Defects in Fe-12.5at%Cr Alloy

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Abstract:

Cluster dynamics (CD) is used to study the evolution of the size distributions of vacancy clusters (VC), self-interstitial atom (SIA) clusters (SIAC) and Cr precipitates in neutron irradiated Fe-12.5at%Cr alloys at T = 573 K with irradiation doses up to 12 dpa and a flux of 140 ndpa/s. Transmission electron microscopy (TEM) and small angle neutron scattering (SANS) data on the defect structure of this material irradiated at doses of 0.6 and 1.5 dpa are used to calibrate the model. A saturation behavior was found by CD for the free vacancy and free SIA concentrations as well as for the number density of the SIAC and the volume fraction of the Cr precipitates for neutron exposures above 0.006 dpa. The CD simulations also indicate the presence of VC with radii less than 0.5 nm and a strong SIAC peak with a mean diameter of about 0.5 nm, both invisible in SANS and TEM experiments. A specific surface tension of about 0.028 J/m² between the a matrix and the Cr-rich a' precipitate was found as best fit value for reproducing the long-term Cr evolution in the irradiated Fe-12.5%Cr alloys observed by SANS.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

449-457

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.449

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Online since:

June 2011

Authors:

Aleksandr R. Gokhman, Andreas Ulbricht, Uwe Birkenheuer, Frank Bergner

Keywords:

Cluster Dynamics, Defect, Iron-Chromium Alloys, Neutron Irradiation

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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[2] and the CD simulations. Fig. 2. Dose dependence of the mean radius of the VC and the mean diameter of the SIAC, (Rv)mean and (2Ri)mean, for the irradiated Fe-12. 5 at%Cr alloy according to the TEM experiment.

[2] and the CD simulations. Fig. 3. Size distributions of self interstitial atom cluster in Fe-12. 5%Cr for different irradiation conditions as obtained from the CD simulations. Fig. 4. Dose dependence of the volume fraction and mean radius of the Cr precipitates, Cv, Cr and ()mean, for the irradiated Fe-12. 5%Cr alloy according to the TEM experiment.

DOI: 10.7717/peerj.9935/fig-5

[2] and the CD simulations.