Unveiling the interplay of deformation mechanisms in a metastable high entropy alloy with tuned composition using synchrotron X-ray diffraction

The mechanical behavior of a metastable high entropy alloy (HEA) with composition Fe39-Mn20-Co20-Cr15-Si5-1Al at% is investigated. deformation mechanisms contributing to its properties are unveiled, by performing uniaxial tensile tests in situ synchrotron X-ray diffraction. Three distinct regimes detected. initial elastic and early dislocation-based plasticity followed moderate work hardening rate regime, which associated the deformation-induced phase formation ε-martensite, hexagonal close-packed (hcp) crystal structure as well slip parent austenitic phase. During third transformation continues occur combination 2 modes hcp twinning unfavorably oriented grains for twinning. interplay all these co-existing can be evidenced