Effects of deformation and annealing on the microstructures and properties of a nonequiatomic Co29Cr29Fe29Ni12.5W0.5< /sub> high-entropy alloy
Materials Science and Engineering: A(2021)
Abstract
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.
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Key words
Dislocation,High-entropy alloys,Mechanical properties,Stacking fault,Twinning
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