Impact response of metastable dual-phase high-entropy alloy Cr10Mn30Fe50Co10.

Plate impact experiments are conducted on a metastable dual-phase high-entropy alloy (HEA) Cr 10 Mn 30 Fe 50 Co 10 with different matrix grain sizes and phase fractions. Free surface velocity histories are obtained along with microstructure characterizations. Postmortem samples are characterized with transmission electron microscopy and electron backscatter diffraction. Multiple deformation mechanisms are observed, including dislocation slip and stacking fault in the face-center cubic (FCC) phase, dislocation slip and deformation twinning in the hexagonal close-packed (HCP) phase, and the FCC to HCP transformation. For spallation, damage is ductile in nature. Despite different microstructures, micro-voids prefer to nucleate at high-angle grain boundaries within the FCC phase, leading to similar spall strength. Upon shock loading, a dynamic plastic deformation partitioning behavior among the two phases is observed; at high shock stress, denser dislocations in the HCP phase result in increased fractions of voids around the FCC/HCP phase interface and within the HCP phase during spallation damage. • C r10 M n30 F e50 C o 10 with different FCC grain sizes and phase fractions are obtained. • Damage is ductile in nature, spall strengths for different microstructures are similar. • Multiple deformation mechanisms are observed, including FCC to HCP transition. • A dynamic plastic deformation partitioning behavior in two phases is observed. [ABSTRACT FROM AUTHOR]