Abstract
The addition of carbon in medium-entropy and high-entropy alloys offers a convenient way to improve their mechanical as well as physical properties. However, no fundamental change in their crystal structures has been found so far. Here we report the observation of structural transformation by adding carbon in the hexagonal MoReRu medium-entropy alloy. It is found that a single face-centered cubic phase exists in MoReRuCx over a wide carbon content range of x = 0.9 to 1.2. Within this phase region, MoReRuCx exhibits both high hardness above 10 GPa and bulk Bardeen-Copper-Schrieffer-like superconductivity, with Tc mainly governed by the electron-phonon coupling strength. We argue that the observed structural transformation is driven by valence electron concentration and local lattice distortion, which suggests that it might also occur in carbon-added high-entropy alloys isostructural to MoReRu.
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