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Computational modeling of radiation-induced segregation in concentrated binary alloys

Published online by Cambridge University Press:  10 April 2013

Santosh Dubey  and
Anter El-Azab
Santosh Dubey
Affiliation:
School of Nuclear Engineering, Purdue University, West Lafayette, IN, USA
Anter El-Azab
Affiliation:
School of Nuclear Engineering, Purdue University, West Lafayette, IN, USA
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Abstract

A sharp-interface model to study radiation-induced segregation in binary alloy has been developed. This model is based on a set of reaction-diffusion equations for the point defect and atomic species concentrations, with a stochastic, spatially-resolved, discrete defect generation terms representing the cascade damage. An important feature of this model, which is significantly different from the way radiation-induced segregation has been studied in the past, is that the role of the boundaries as defect sinks has been ensured by defining defect-boundary interactions via a set of reaction boundary conditions. Defining defect-boundary interactions in this way makes it possible to capture the process of segregation as a consequence of boundary motion. The model is tested in 2D for Cu-Au solid solution with the material surface being free to move. The Gear method has been used to solve the reaction-diffusion equations. Enrichment of Cu and depletion of Au have been observed near to the boundaries.

Keywords

alloydefectsradiation effects
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1526: Symposium TT – Defects and Microstructure Complexity in Materials , 2013 , mrsf12-1526-tt08-03
Copyright
Copyright © Materials Research Society 2013

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