Chemical medium-range order in a medium-entropy alloy

Jing Wang, Ping Jiang, Fuping Yuan and Xiaolei Wu ()
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Jing Wang: Chinese Academy of Sciences
Ping Jiang: Chinese Academy of Sciences
Fuping Yuan: Chinese Academy of Sciences
Xiaolei Wu: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: 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 Al9.5CrCoNi MEA. Specifically, the electron diffraction under both [ $$112$$ 112 ] and [ $$013$$ 013 ] 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-resolution EDS mapping. These findings substantiate CMRO with a realistic structural picture in view of crystal periodicity and chemical species occupation, shedding light on understanding the microstructural link at an extended length scale beyond the short-range order.

Date: 2022
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DOI: 10.1038/s41467-022-28687-w

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