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Characterization and Modeling of Irradiation Induced Nanoclusters in Ferritic-Martensitic and Zirconium-Niobium Alloys.

Citation

Adisa, Saheed Bayonle. (2020-12). Characterization and Modeling of Irradiation Induced Nanoclusters in Ferritic-Martensitic and Zirconium-Niobium Alloys.. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/adisa_idaho_0089e_12030.html

Title:
Characterization and Modeling of Irradiation Induced Nanoclusters in Ferritic-Martensitic and Zirconium-Niobium Alloys.
Author:
Adisa, Saheed Bayonle
Date:
2020-12
Program:
Materials Science
Subject Category:
Materials Science; Nuclear physics and radiation
Abstract:

The objective of this dissertation is to characterize, and model irradiation-induced solute clustering in commercially ferritic-martensitic alloys (T91, HCM12A, and HT9) and Zr-1 % Nb alloys following ions or neutron irradiations and also to prescribe the required temperature shift for ion irradiations to emulate neutron irradiation. Ferritic-martensitic alloys are irradiated with Fe2+ or neutrons to a dose of 3 dpa at 500 °C and 370 °C while Zr- 1 %Nb alloy is irradiated with Kr2+ or neutrons irradiated to 5 dpa at 310 °C. Irradiation induced segregation and nanocluster morphology are analyzed using atom probe tomography. The size and number density in each F/M alloys differ with ions or neutron irradiation while the morphology of Nb-rich nanoclusters following Krypton irradiation is comparable to that seen after neutron irradiation. Two distinct models (Cluster dynamic and NHM model) are utilized to simulate nanocluster evolution in F/M alloys and they both predicted a negative temperature shift will be needed for ion irradiation to emulate neutron irradiation damage.

Description:
doctoral, Ph.D., Materials Science -- University of Idaho - College of Graduate Studies, 2020-12
Major Professor:
Swenson, Matthew J
Committee:
Aston, Eric ; Charit, Indrajit; Raja, Krishnan S
Defense Date:
2020-12
Identifier:
Adisa_idaho_0089E_12030
Type:
Text
Format Original:
PDF
Format:
application/pdf

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