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 (TRIP) effect even in ½ turn (shear strain, ? = 15) HPT processing, which increased further with increasing the number turns 2 (? 68). Additionally, nano-structuring and heavily dislocated structure; dislocation density was order 1015 m?2. c/a ratio transformed HCP phase found be <1.633 it did not change extent shear strain. This manifested as occurrence at least 50% non-basal slip phase. For first time, fraction dislocations are quantified their evolution discussed purview studied alloy. micro-mechanism strain accommodation correlated hardness upon sequential processing. present work provides viewpoint that metastable FCC can have tailored triggers slip, leading strong ductile material.