| Abstract Scope |
Recent studies on multi-principal element alloys (MPEAs) have increasingly focused on the role of short-range order (SRO) on material performance. However, the mechanisms of SRO formation and its impact on the mechanical properties of these alloys remain elusive, hindering advancements in SRO engineering. This presentation will cover two projects aimed at addressing these gaps. First, we integrate additive manufacturing, advanced electron microscopy, and atomistic modeling to demonstrate that significant SRO can form during solidification in several CoCrNi-based face-centered-cubic MPEAs, revealing that SRO is ubiquitous in this class of alloys. Second, we employ in situ nanomechanical testing and energy-filtered four-dimensional scanning transmission electron microscopy (4D-STEM) to observe the rejuvenation process in CrCoNi during cyclic mechanical loading. Molecular dynamics simulations further confirm that these changes in stacking fault reversibility are triggered by the local breakdown of SRO. Together, these studies offer new insights into the formation and dynamic behavior of SRO. |