1 Effect of Neutron Irradiation on Defect Evolution in Ti 3 SiC 2 and Ti 2 AlC Darin J. Tallman,* 1 Lingfeng He, 2 Brenda L. Garcia-Diaz, 3 Elizabeth N. Hoffman, 3 Gordon Kohse, 4 Robert L. Sindelar, 3 and Michel W. Barsoum 1 1 Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104 2 Idaho National Laboratory, Idaho Falls, ID 83415 3 Savannah River National Laboratory, Savannah River Site, Aiken, SC 29808 4 MIT Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 *Corresponding author: tallman@drexel.edu