Deformation and damage of heterogeneous-structured high-entropy alloy CrMnFeCoNi under plate impact

Plate impact experiments are conducted on a hot-rolled, heterogeneous-structured, high-entropy alloy CrMn-FeCoNi consisting of two types of domains: the UR domains containing unrecrystallized stretched grains and the FR domains containing fine recrystallized grains. Free surface velocity histories are obtained along with microstructure characterizations. Shock-induced deformation twinning is activated firstly in the UR domains, and the dislocation density of the FR domains increases more significantly during shock compression. Under similar shock stress, spall strength is the highest for loading along the rolling direction as a result of the texture-induced highest longitudinal sound velocity. Voids prefer to nucleate at the triple junctions of high angle grain boundaries in the FR domains or around the UR-FR domain boundaries. Compared to the homogeneous (annealed) structure, the heterogeneous structure leads to a negligible increase in spall strengths because of grain refinement in the FR domains and relatively severe plastic deformation around the UR-FR domain boundaries.

Automated summary

Plate impact experiments were conducted on a heterogeneous-structured high-entropy alloy to investigate its microstructure and shock-induced deformation. Different types of domains exhibited varying deformation mechanisms and changes in dislocation density. The heterogeneous structure had minimal impact on spall strengths due to the grain refinement and plastic deformation at the domain boundaries.