Abstract
Microstructural evolution and mechanical properties of FeMnCoCr high entropy alloy containing C and Si at various temperatures were investigated. The experimental results demonstrate that the microstructure of the HEAs alloy is a single-phase face-centered cubic solid solution, and the C and Si are completely dissolved in the matrix. The stacking fault energy of the alloy is about 33.96 mJ/m2. Therefore, twins will be easy to form during the deformation process. Benefit from the synergistic effect of solid solution strengthening and twinning induced plasticity, the alloy shows a trade-off between high strength and good plasticity. Ultimate tensile strength of 757 MPa and considerable fracture ductility of 60.5% is obtained at room temperature. As the deformation temperature decreased to 227 K, the strength and plasticity are increased to 907 MPa and 69.6%, respectively. Under the low temperature, primary mechanical twins are suppressed, and more geometrically necessary dislocations and secondary nanoscale twins could be observed. The HEAs show a high work-hardening rate, which is related to dislocation slip being hindered by primary and secondary nano-twins.
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