|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
|Thermal and Irradiation-induced Grain Growth in Nanocrystalline High-entropy Alloys
|William J. Weber, Yanwen Zhang, Chinthaka Silva, Timothy G Lach, Walker L Boldman, Philip D Rack, Li Jiang, Lumin Wang, Graeme Greaves, Matheus A Tunes, Stephen E Donnelly
|On-Site Speaker (Planned)
Grain growth in nanocrystalline materials is generally thermally activated but can be driven by irradiation-induced defects and structural instabilities at lower temperatures. In nanocrystalline high-entropy alloys (HEAs), Ni20Fe20Co20Cr20Cu20 and (NiFeCoCr)97Cu3, microstructural evolution under irradiation with Ni and Au ions at room temperature has been investigated. Experimental results suggest that, similar to nanocrystalline oxides, irradiation-induced grain growth is driven by the coupling of electronic and ballistic energy dissipation that leads to faster grain growth than under thermal annealing at 300°C. Grain growth follows a power law dependence that suggests irradiation-induced instabilities at grain boundaries lead to rapid local rearrangements of atoms. The additive effect of electronic and ballistic energy dissipation on grain growth opens new possibilities to modify HEAs at relative low temperatures.
|High-Entropy Alloys, Nanotechnology, Process Technology