On prominent TRIP effect and non-basal slip in a TWIP high entropy alloy during high-pressure torsion processing

Severe plastic deformation response of a face centered cubic (FCC) twinning induced plasticity (TWIP) high entropy alloy (HEA), Fe40Mn40Co10Cr10, subjected to high-pressure torsion (HPT) is investigated. The so-called TWIP HEA demonstrated an extensive transformation induced plasticity (TRIP) effect even in ½ turn (shear strain, γ = 15) of HPT processing, which increased further with increasing the number of turns to 2 (γ = 68). Additionally, HPT induced nano-structuring and heavily dislocated structure; dislocation density was of the order of 1015 m−2. c/a ratio of the transformed HCP phase was found to be