Microstructural Processes in Irradiated Materials: Nuclear Fuels and Ceramics
Sponsored by: TMS Structural Materials Division, TMS: Nuclear Materials Committee
Program Organizers: Thak Sang Byun, Pacific Northwest National Laboratory; Chu-Chun Fu, Commissariat Ó l'Únergie atomique et aux Únergies alternatives (CEA); Djamel Kaoumi, University of South Carolina; Dane Morgan, University of Wisconsin-Madison; Mahmood Mamivand, University of Wisconsin-Madison; Yasuyoshi Nagai, Tohoku University

Thursday 2:00 PM
March 2, 2017
Room: Del Mar
Location: Marriott Marquis Hotel

Session Chair: Mark Asta, University of California-Berkeley; William Weber, University of Tennessee

2:00 PM  Invited
Amorphization and Recrystallization in Ion-irradiated Ceramics: William Weber1; Eva Zarkadoula2; Ritesh Sachan2; Haizhou Xue1; Yanwen Zhang2; 1University of Tennessee; 2Oak Ridge National Laboratory
    During ion irradiation of ceramics, amorphization and recrystallization are often competing processes that depend on temperature. In this work, experimental and computational approaches are used to investigate the separate and combined effects of nuclear and electronic energy loss on amorphization and recrystallization in several complex oxide ceramics. Experimentally, ion mass and energy are used to control the ratio of electronic to nuclear energy loss, and large-scale atomistic simulations that include ballistic and thermal spike processes are used to model these effects. The results demonstrate that electronic energy loss, typical of MeV ions, can lead to additive or synergistic effects on amorphization; however, below a threshold in electronic energy loss, ionization-induced recrystallization dominates. These results have significant implications for interpreting and modeling the irradiation response of nuclear ceramics in accelerated testing using MeV ion irradiation. This work was supported by the U.S. DOE, BES, MSED.