Abstract
In this study, selective vacuum arc furnace is used to fabricate CoCrFeNi-M0.4 (M = Zr, Hf, 50 %Zr + 50 %Hf) EHEAs, and the content of Zr and Hf element is controlled to solve the balance of strength and plasticity in HEAs. Through alloying with Zr or Hf, the cross fluvial eutectic structure of CoCrFeNiZr0.4 and CoCrFeNiHf0.4 are consists of FCC-CoCrFeNi matrix phase and intermetallic. CoCrFeNiZr0.2Hf0.2 EHEAs, which is synergistic alloying with Zr and Hf, have a brawny river eutectic structure of both soft FCC and hard Ni7Hf2 intermetallic. The synergistic precipitation strengthening and solid solution strengthening result in the fracture strength and ductility of CoCrFeNiZr0.2Hf0.2 reaching 3475.7 MPa and 14.1 %, respectively. Furthermore, CoCrFeNiZr0.2Hf0.2 exhibit a good combination of strength and plasticity through synergistic alloying effect compared with other CoCrFeNi HEAs.
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