| Abstract Scope |
Recently, the concept of heterostructures has been used to make high entropy alloys (HEAs) strong and tough. Specifically, heterostructures are found to produce unprecedented strength and ductility that are not accessible to their conventional homogeneous counterparts. Structural heterostructured materials consist of heterogeneous zones with dramatic (>100%) variations in mechanical properties. Their superior mechanical properties come from the pile-ups of geometrically necessary dislocations (GNDs), which produce hetero-deformation induced (HDI) strengthening and work hardening. HEAs have been reported to exhibit a unique dislocation behavior: planar dislocation slip, which is caused by their low stacking fault energy and local element clustering. This makes HEAs ideal form making heterostructured materials because planar slip promotes GND pile-up by hindering cross-slip. However, not all heterostructures produce significant HDI effect and superior mechanical properties. In this talk I’ll discuss the principle and design of heterostructured HEAs. |