Microstructural features and tensile behaviors of a novel FeMnCoCr high entropy alloys

C and Si-doped FeMnCoCr high entropy alloys (HEAs) with grain size of approximate 200 μm were prepared. Quasi-in-situ EBSD was used to characterize the microstructural evolution under different tensile strains. The tensile strength of the HEAs is about 670 MPa and the fracture elongation is 47%. The single-phase FCC structure was maintained during the entire tensile procedure, whereas the deformation mechanism was found to change from dislocation slip to twinning under higher strains. Moreover, it was observed that twins are inclined to form within grains with 〈1 1 1〉 texture.