The Influence of Defect-Solute Interactions on Segregation of Au Implanted Into Binary Ni Alloys at Elevated Temperatures

James, Michael Richard

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Description

Title

The Influence of Defect-Solute Interactions on Segregation of Au Implanted Into Binary Ni Alloys at Elevated Temperatures

Author(s)

James, Michael Richard

Issue Date

1997

Doctoral Committee Chair(s)

Stubbins, James F.

Department of Study

Nuclear Engineering

Discipline

Nuclear Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Engineering, Nuclear

Language

eng

Abstract

The diffusion behavior of solutes under irradiation in a Ni matrix have been investigated. The behavior of the solutes Si, Be, Ge, and Al were studied by directing a 300 keV Au$\sp+$ beam at the material and observing the resultant profiles of the solutes. The implanted Au was also investigated in the same manner. The implantations were performed at various temperatures between 25 and 700$\sp\circ$C at a Au dose of $1.0\times10\sp{16}.$ Depletion of the existing solutes was observed in all cases and attributed to radiation-induced segregation effects attributable to fluxes of defects established by the irradiating beam. At elevated temperatures, the amount of Au retained in the target declined dramatically, losses that attributed to sputtering from a monolayer established at the surface by Gibbsian Segregation. Simulation of the implantations by a theoretical kinetic model was used to produce values for the important defect migration and binding parameters that are responsible for the most significant radiation effects. The derived parameters are in agreement with other published results and can be used to predict the general behavior of the solutes in the Ni system under irradiation.

Graduation Semester

1997

Type of Resource

text

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