Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Nanocluster Evolution under Irradiation in Precipitation Strengthened Alloys" By Priyam V. Patki Purdue MSE Preliminary Exam Advisors: Professor Janelle P. Wharry and Professor Maria A. Okuniewski ABSTRACT Precipitation Strengthened Materials like Oxide Dispersion Strengthened (ODS) Steel alloys and Ni super alloys have become attractive materials for use as structural materials in Advanced Nuclear Reactors exposed to higher operating temperatures and higher irradiation damage doses. This study reviews and summarizes the various irradiation experiments carried out on ODS alloys and Ni alloys. Commonly observed changes in nanocluster evolution are in its size, number density, chemistry and crystal structure. It is observed that nanocluster evolution is more probable to take place under ion irradiation than it is under neutron irradiation. Trends based on temperature have been observed to affect the chemistry and crystal structure of nanoclusters. This review also studies the various mechanisms such as ballistic dissolution, Ostwald ripening, irradiation enhanced diffusion and homogeneous nucleation which can be used to explain nanocluster evolution in materials. As one mechanism cannot suffice to explain nanocluster evolution, efforts using multiple mechanisms have been made to predict nanocluster evolution but there is still a need for a more holistic approach. Date: Wednesday, September 25, 2019 Time: 12:00 P.M. Place: ARMS 1021