Physics

Structural motif

Cuboid

Mathematics

Crystallography

Optics

Composite material

Diffraction

Acoustics

Chemistry

Scattering

Materials science

Geometry

Alloy

Nuclear magnetic resonance

Motif (music)

Materials Research Letters

The chemical short-range orders (CSRO) are the sub-nanosized entities inherent in high-/medium-entropy alloys (H/MEA). To discern CSRO poses the challenge with pending issues as to under what zone axis in electron diffraction, signature scattering specific to CSRO will appear and what the structure motif of CSRO is. Here, we show extra diffuse scattering by CSRO from [111] and [112] directions in a VCoNi MEA and accordingly, construct the L11-type structure motif, and derive the spacial shape of flat cuboid of CSRO in virtue of diffractions under varying zone axis. Moreover, we demonstrate the methods to identify CSRO in lattice images.

Structure motif of chemical short-range order in a medium-entropy alloy