NE Special Colloquium - Juie Tucker, Ph.D.
Mechanical property degradation due to isothermal ageing combined with irradiation is of potential concern for alloys based on the Ni-Cr binary system, such as alloys 625 and 690. The disorder-order phase transformation, which is the primary source of embrittlement, has been studied in commercial and model alloys by experimental approaches including: synchrotron x-ray diffraction, atom probe tomography, transmission electron microscopy, nanoindentation and micropillar compression, to clarify the evolution of ordered phase fraction on mechanical properties. Model and commercial alloys with different stoichiometries have been isothermally aged up to 20,000 hours or proton irradiated up to 6 dpa. Isothermal ageing and irradiation results show ordering for all model alloy stoichiometries studied. Irradiation of commercial alloys also resulted in ordered phase formation. Micropillar compression studies on aged alloys show that ordering promote twinning in certain grain orientations.
Tuesday, May 7 at 2:00pm to 3:00pm
Nuclear Engineering Building, 302
1412 Circle Drive Knoxville TN 37996