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MATERIALS ENGINEERING
“In Situ TEM Mechanical Testing in Irradiated Oxide Dispersion Strengthened Alloys”
By
Kayla H. Yano
Purdue MSE Ph.D. Final Exam
Advisors: Professor Janelle P. Wharry and Professor Maria Okuniewski
ABSTRACT
The objective of this dissertation is to demonstrate the use of in situ TEM mechanical testing to find mechanical properties of as received, self-ion,
and proton irradiated Fe-9%Cr ODS. The use of charged particle irradiation in the evaluation of nuclear reactor candidate materials requires the development of novel methods to assess mechanical properties in near-surface irradiation damage layers. Yet at
such small micron or nanometer scales the mechanical properties can begin to be impacted by size-effects. In this work micropillar compression, cantilever bending, lamellae indentation, and clamped beam fracture testing is conducted on ion-irradiated Fe-9%Cr
ODS to find yield stress, elastic modulus, flow stress, and fracture toughness. We find a threshold in sample dimension at which size-effects are observed that is directly related to obstacle spacing. By combining an understanding of the microstructure of
irradiated Fe-9%Cr ODS and the in situ TEM technique, one can find the bulk-like mechanical properties of ion irradiated Fe-9%Cr ODS.
Date: Thursday, April 18, 2019
Time: 9:00 A.M.
Place: ARMS 3115