Effects of deformation and annealing on the microstructures and properties of a nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloy

Nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloys (HEAs) were prepared by vacuum induction melting and subsequent mechanical processing. The HEA with face-centered cubic and few hexagonal close-packed structure phases exhibited outstanding mechanical properties. After annealing at 725 degrees C, the yield strength and fracture elongation were 1.13 GPa and 24.3%, respectively. The outstanding mechanical properties were attributed to the addition of the W element and ultrafine grain structure. The results demonstrated that dislocation slip, stacking faults, and nano-twins governed the deformation mechanism, and these defects were responsible for the decrease in the work-hardening rate during the deformation processing in the 725 degrees C-annealed alloy.

Automated summary

Nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloys exhibited outstanding mechanical properties after annealing at 725 degrees C, attributed to the addition of the W element and ultrafine grain structure. Dislocation slip, stacking faults, and nano-twins governed the deformation mechanism in the annealed alloy.