|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Mechanisms of Damage Tolerance of CrCoNi-based High-entropy Alloys
||Robert O. Ritchie, Bernd Gludovatz, Qian Yu, Easo George
|On-Site Speaker (Planned)
Equiatomic multi-component alloys are an intriguing new class of materials that have received significant attention in the materials science community as of late. Some of these alloys can crystallize as single-phase solid solutions with simple crystal structures despite containing high concentrations of elements with very different crystal structures which makes them interesting from a fundamental scientific viewpoint. Additionally, they can display a good combination of mechanical properties making them attractive for a wide range of applications. Here we examine single-phase medium- and high-entropy, face-centered-cubic CrCoNi-based alloys, which exhibit exceptional combinations of strength, ductility and fracture toughness at ambient to cryogenic temperatures, consistent with their high lattice friction and low stacking fault energy characteristics. We further use in situ transmission electron microscopy to identify in real time a synergy of deformation mechanisms including planar dislocation slip, rapid motion of partial dislocations, near-tip crack bridging and deformation-induced nano-twinning.
||Planned: Supplemental Proceedings volume