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Traditional metallic alloys are mixtures of elements where the atoms ofminority species tend to distribute randomly if they are below their solubilitylimit, or lead to the formation of secondary phases if they are above it.Recently, the concept of medium/high entropy alloys (MEA/HEA) has expanded thisview, as these materials are single-phase solid solutions of generallyequiatomic mixtures of metallic elements that have been shown to displayenhanced mechanical properties. However, the question has remained as to howrandom these solid solutions actually are, with the influence of chemicalshort-range order (SRO) suggested in computational simulations but not seenexperimentally. Here we report the first direct observation of SRO in theCrCoNi MEA using high resolution and energy-filtered transmission electronmicroscopy. Increasing amounts of SRO give rise to both higher stacking faultenergy and hardness. These discoveries suggest that the degree of chemicalordering at the nanometer scale can be tailored through thermomechanicalprocessing, providing a new avenue for tuning the mechanical properties ofMEA/HEAs.

Verification of Short-Range Order and Its Impact on the Properties of the CrCoNi Medium Entropy Alloy