A Hall–Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

Abstract Multi-principal element alloys (MPEAs) are an emergent class of metallic materials that displays a huge range possible properties and applications. CrCoNi MPEAs attract great interest because they show good strength–ductility combinations, especially in Cr-rich non-equiatomic compositions. In this work, the Cr 40 Co 30 Ni MPEA was produced characterized at different annealing conditions. This alloy balance, evidenced by high uniform deformation (55–70%) estimated toughness. It also exhibits strengthening grain refining, given Hall–Petch slope ( k = 655 MPa/μm −0.5 ). The growth kinetics analysis provides estimates can aid design processing for future Deformed samples displayed both TWIP TRIP effects, once mechanical twins HCP martensitic phase, arranged nanometric lamellae, formed during straining, greatly increasing number interfaces microstructure providing tension. Graphical abstract