Microstructure and Properties of(NiAl)63-xV20Cr17Bx Eutectic High-entropy Alloy
A non-equiatomic(NiAl)63-xV20Cr17Bx eutectic high-entropy alloy was prepared by non-self-consumable vacuum melting furnace,and effects of B on microstructure and mechanical properties of alloys were investigated by means of XRD,EPMA,and universal experimental machine.The results indciate that(NiAl)63V20Cr17 alloy is composed of B2+BCC dual-phase eutectic structure,which belongs to seaweed-like eutectic dendrites with regular lamellar eutectic surrounded by irregular lamellar eutectic.With the increase in B content,the microstructure of(NiAl)63-xV20Cr17Bx alloys is transformed from the lamellar eutectic structure(x=0)to hypoeutectic structure(x>0.4),and nanoprecipitates(containing M2B compounds)are generated on primary phase.The hardness of alloy is increased and then decreased,and the fracture strength and fracture strain continue to be increased.When x=0.8,the high entropy alloy exhibits desirable comprehensive mechanical properties,where the hardness,yield strength,frac-ture strength and fracture strain reach 556 HV,1 523 MPa,3 348 MPa and 34.5%,respectively.
High Entropy AlloyEutectic AlloyMicrostructureMechanical Property
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