|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Nanomechanical Behavior and Nano-indentation Size Effects in High Entropy Alloys
||Sanghita Mridha, Hunter Oltman, Sundeep Mukherjee
|On-Site Speaker (Planned)
Nano-mechanical behavior of several high entropy alloys was investigated in as-cast, rolled, annealed, and thin-film forms. Dislocation nucleation was studied by repeated indents at low load for the different processing conditions. Distinct displacement bursts were observed in the loading curve marked by incipient plasticity for all the samples. The as-cast and annealed samples showed pop-ins for 100% of the indents, while the rolled and thin-film samples showed much lower fraction of displacement bursts. This was explained by the high density of dislocations for the cold-worked and thin-film conditions. The strong depth dependence of hardness was explained by geometrically necessary dislocations. The nano-mechanical behavior and twinned microstructure was explained by low stacking fault energy for these high entropy alloys.
||Planned: Supplemental Proceedings volume