|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Structural Damage and Phase Stability of Al0.3CoCrFeNi High Entropy Alloy under High Temperature Ion Irradiation
||Tengfei Yang, Wei Guo, Jonathan Poplawsky, Dongyue Li, Ling Wang, Yuan Fang , Zhanfeng Yan, Yong A. Zhang, Yugang Wang , Steven J. Zinkle
|On-Site Speaker (Planned)
A single phase high entropy alloy (HEA) Al0.3CoCrFeNi was irradiated by 3 MeV Au ions to a fluence of 6×1015 cm-2 at four different temperatures ranging from 250 to 650 ºC. Transmission electron microscopy (TEM) and Atom probe tomography (APT) were employed to study the evolution of structural damage, segregation behavior and phase stability with irradiation temperatures. Compared with Al0.1CoCrFeNi and other conventional alloys, Al0.3CoCrFeNi exhibits a similar but much slower evolution of structural defects with increasing irradiation temperature. Furthermore Al0.3CoCrFeNi HEA exhibits great structural stability against high temperature irradiations; no significant phase decomposition or transformation occurs. In contrast, B2 precipitates enriched with Ni and Al can be found in unirradiated substrate when the irradiation temperature is higher than 250 ̊C. Based on the intrinsic characteristics of HEAs and previous results on the irradiation damage of similar alloy systems, the correlation between irradiation responses of HEAs and their compositional complexity, lattice distortion and thermodynamic property was discussed.
||Planned: Supplemental Proceedings volume