Chemical medium-range order in a medium-entropy alloy.

ABSTRACT: High-/medium-entropy alloys (H/MEA) have the inherent local chemical order. Yet, as a structural link between the incipient short-range order and mature long-range counterpart, the chemical medium-range order (CMRO) is conjectural and remains open questions as to if, and what kind of, CMRO would be produced and if CMRO is mechanically stable during plastic deformation. Here, we show compelling evidences for CMRO in an Al_9.5CrCoNi MEA. Specifically, the electron diffraction under both [[Formula: see text]] and [[Formula: see text]] zone axis show the definite spots for CMRO of lattice periodicity. CMRO entities are seen directly of medium-ranged in sizes by using dark-field imaging, along with the tendency towards like-pair avoidance and unlike-pair preference based on atomic-res

SUBMITTER: Wang J 

PROVIDER: S-EPMC8866532 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature