Enhancing the strength and ductility of CoCrFeMnNi high-entropy alloy by nitrogen addition

We reported a nitrogen-containing CoCrFeMnNi high-entropy alloy (HEA) with ultrafine-grained structure. Nitrogen addition significantly enhanced the yield strength and retained high ductility, due to the increase of lattice frictional forces and the maintaining planar slip and twinning, providing an accessible way to ameliorate mechanical properties of HEAs.