|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Stabilization of Nanocrystalline Alloys at High Temperatures via Utilizing High-entropy Grain Boundary Complexions
||Naixie Zhou, Tao Hu, Mingde Qin, Jiajia Huang, Jian Luo
|On-Site Speaker (Planned)
Multicomponent alloying can be utilized to enhance the thermal stability of nanocrystalline alloys. The grain boundary energy can be reduced significantly via both bulk and grain-boundary high-entropy effects with increasing temperature at/within the solid solubility limit, thereby reducing the thermodynamic driving force for grain growth. Moreover, grain boundary migration can be hindered by sluggish kinetics. Analytical models were developed on multicomponent ideal solutions ideal solutions to demonstrate both bulk and grain-boundary high-entropy effects on reducing grain boundary energies. To further test these new theories, numerical experiments were conducted. Subsequently, several nanoalloys were designed and fabricated to demonstrate outstanding thermal stabilities that outperform the Ni-based binary nanocrystalline alloys. Finally, the mechanical properties of sintered bulk nanoalloys will also be presented and discussed.