Enhancement of strength-ductility trade-off by microstructure control of C-doped FeNiCoCr HEA.

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The 1%C-doped CoCrFeNi HEA performed high deformability by larger 60% thickness reduction of cold-rolling without macroscopic crack. As-rolled sample obtained high dislocation density resulting in the microhardness of 398 HV. The microstructure evolution of as-rolled samples was studied during isochronal annealing (1 hour) at 978, 1078 and 1178 K in terms of grain morphology, dislocation density and carbide precipitation. The solute drag effect and carbide precipitations due to carbon addition delayed the recrystallization process. In the fully recrystallized microstructure after 1178 K heat-treatment, the average grain size is about 4 microns and the microhardness is about 228 HV. The fine recrystallized grains were resulted by large dislocation density of as-rolled sample.