A novel face-centered-cubic high-entropy alloy strengthened by nanoscale precipitates

A new single-phase face-centered-cubic (FCC) Co₉Cr₇Cu₃₆Mn₂₅Ni₂₃ [atomic percent, similar hereinafter] high-entropy alloy (HEA) was prepared by arc melting. A uniform distribution of nanometer-sized precipitates was achieved. The tensile yield strength, ultimate tensile strength, and elongation were 401 MPa, 700 MPa, and 36%, respectively. The energy-dispersive spectrometer results showed that the nano-precipitates were rich in Co and Cr elements. Moreover, the crystal-forming behavior and the nanoscale-precipitates-forming mechanism were revealed.