|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Serrated Flow and Creep Behavior under Nanoindentation Experiments in an Al0.5CoCrCuFeNi HEA High-entropy Alloy
||Shuying Chen, Xie Xie, Weidong Li, Jamieson Brechtl , Guangfeng Zhao, Peizhen Li, Fuqian Yang, Junwei Qiao, Karin A Dahmen, Peter K Liaw
|On-Site Speaker (Planned)
Nanoindentation was utilized to investigate the nano-scale plastic deformation in the Al0.5CoCrCuFeNi high entropy alloy at room temperature (RT) and 200 ℃, respectively. The phenomenon of serrated flows was observed in the loading period. Temperature shows strong effects on the serration behavior. The creep behavior under various holding periods at the maximum load was studied, and the stress exponent was derived. Creep modeling with a two-layer viscoplastic model suggests that the creep at a higher temperature leads to a greater and faster-growing plastic zone underneath the indenter, implying more pronounced dislocation activities. It should also be noted that from the viewpoint of mean-field theory (MFT), the κ value for all three conditions is in relative agreement with the model’s prediction of κ = 1.5. Nevertheless, the resulting exponents, κ and λ, in addition to the function C'(qTλ) can be used to help predict the pop-in statistics at other temperatures.
||Planned: Supplemental Proceedings volume