Irradiation-Induced Microstructural Evolution and Mechanical Properties in Iron With and Without Helium
Okuniewski, Maria Ann
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https://hdl.handle.net/2142/85918
Description
Title
Irradiation-Induced Microstructural Evolution and Mechanical Properties in Iron With and Without Helium
Author(s)
Okuniewski, Maria Ann
Issue Date
2008
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, Materials Science
Language
eng
Abstract
The results of the experiments and simulations were directly compared and related. The major findings included: (1) A link was established between the irradiated microstructure and its impact on mechanical properties. This was achieved through the quantitative evaluation of the ex-situ TEM defect analyses and the relationship of nanohardness to yield strength. The microstructural results from KMC modeling were also related to the mechanical properties through the Dispersed Barrier Model. (2) KMC was identified as a complementary technique for microstructural evaluation since it resulted in a distribution of defects that were not visible via TEM, however they are known to be present based on the PAS results. (3) PAS results and KMC simulations were compared with ATSUP calculations to quantify defect size versus positron lifetime.
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