Design of ultrastrong but ductile medium-entropy alloy with controlled precipitations and heterogeneous grain structures

In this study, we develop a non-equiatomic Co2CrNi1.5Al0.25Ti0.25 quinary medium-entropy alloy (MEA). The heterogeneous grain structure (HGS) (comprising residual deformed grains, micro-sized recrystallized grains and nano-sized recrystallized grains) and heterogeneous precipitation (HP) of the L12 phase corresponding to different kinds of grain structures are simultaneously introduced into the alloy by the well-designed thermomechanical...