Microstructure and properties of AlCoCrFeNi2.1 high entropy alloy modified by deformation heat treatment
High-entropy alloys have become a focal point in the field of materials in recent years due to their combination of high strength,toughness,high-temperature mechanical properties,oxidation resist-ance,and corrosion resistance.Eutectic high-entropy alloys combine the advantages of eutectic alloys and high-entropy alloys,making it possible to cast large-scale components.The mechanical properties of the alloy are regulated by cold rolling and annealing,and the changes in microstructure organization and me-chanical properties of the eutectic high-entropy alloy after annealing at different temperatures are investiga-ted by XRD,SEM,EDS,and tensile testing machine.The results showed that the tensile strength of the alloy is abnormally improved after 30％cold rolling,while the elongation plummeted.After annealing at temperatures of 800 ℃,900 ℃,and 1 000 ℃ after 30％cold rolling,the organization gradually changes from partial recrystallisation to complete recrystallisation,accompanied by slight grain growth.After an-nealing at 800 ℃,there are deformed large grains and recrystallised small grains,and a variety of rein-forcement mechanisms work in a coordinated way to make the tensile strength and elongation to 1 272 MPa and 12.39％,respectively.
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