Abstract A series of AlCoxCrFeNi3-x Eutectic-High-Entropy-Alloys (EHEAs) were synthesized to investigate the effects of Co and Ni elements on the microstructure and mechanical properties. It was found that the Ni… Click to show full abstract
Abstract A series of AlCoxCrFeNi3-x Eutectic-High-Entropy-Alloys (EHEAs) were synthesized to investigate the effects of Co and Ni elements on the microstructure and mechanical properties. It was found that the Ni and Co elements in AlCoxCrFeNi3-x alloys could replace each other without changing the types of phases and the microstructure. All the alloys exhibited a uniform and typical eutectic microstructure with mixed structures of FeCrNi-type FCC and NiAl-type B2. The atomic percentage of (Ni + Co) of FCC phases and B2 phases in all AlCoxCrFeNi3-x alloys approximately equaled. Besides, the alloys exhibited a excellent and similar compressive properties that the fracture strength was super to 2000 MPa while the compression ratio exceeded 35%. Among the alloys, the Co-free AlCrFeNi3 alloy had the tensile yield strength of 626 MPa, the ultimate strength of 1200 MPa, and the fracture elongation of 10.1%, respectively. The tensile fracture pattern was a mixed fracture mechanism of ductile and brittle. Compare with the mechanical properties of different types of EHEAs, the FCC + B2 EHEAs have the maximum potential application in industrial areas. Therefore, it is valuable to study the cost-effective AlCoxCrFeNi3-x EHEAs.
               
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