Effect of Al on microstructure and mechanical properties of medium entropy alloy in VCoNi system by laser melting deposition
VCoNi and Al7(VCoNi)93 medium entropy alloys were manufactured by Laser Melting Deposition(LMD),and the microstructure and mechanical properties of the medium entropy alloys were investigated.The re-sults show that the VCoNi medium entropy alloy is a single FCC solid solution structure,while the Al7(VCoNi)93 medium entropy alloy is an FCC+BCC duplex solid solution structure,and the Al element promotes the formation of BCC structure.The influence of Al on the mechanical properties of VCoNi alloy is significant,which increases the hardness and strength of the medium entropy alloy,but decreases the ductility and toughness.Compared with VCoNi,the microhardness of Al7(VCoNi)93 increases from 317HV0.1 to 370HV0.1,the tensile strength increases from 964 MPa to 1 138 MPa,and the impact toughness decreases from 88 J/cm2 to 60.5 J/cm2 at room temperature.
medium entropy alloysLaser Melting DepositionAl-alloyingmicrostructuremechanical property
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