|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||2018 Technical Division Student Poster Competition
||SPG-24: Fatigue Behavior of Ultrafine Grained Al0.3CoCrFeNi High Entropy Alloy
||Kaimiao Liu, Mageshwari Komarasamy, Bharat Gwalani, Mishra Rajiv
|On-Site Speaker (Planned)
The microstructure and fatigue behavior of a fully recrystallized Al0.3CoCrFeNi high-entropy alloy was investigated. As-cast alloy was thermo-mechanically processed via cold rolling followed by annealing to yield ultrafine grained (UFG) microstructure (average grain size of 0.71▒0.35 Ám). The annealed material showed excellent strength-ductility combination with ultimate tensile strength of ~1.1 GPa and elongation to failure of ~25%. The deformation behavior under fully reversible cyclic loading (R=-1) was studied. The deformed microstructure exhibited dislocation accumulation as well as stress concentration around B2 and σ phases, which nucleated the fatigue crack. The UFG Al0.3CoCrFeNi alloy showed enhanced fatigue failure resistance with fatigue runout of ~0.43 UTS. Additionally, the UFG microstructure exhibited lower S-N curve data scatter as compared to other HEAs.