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| Effect of Al on microstructure and mechanical properties of medium entropy alloy in VCoNi system by laser melting deposition |
| YU Hui，ZHAO Lin，PENG Yun，CAO Yang，MA Chengyong，TIAN Zhiling |
| （Central Iron and Steel Research Institute，Beijing 100081，China） |
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Abstract VCoNi and Al
7(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.
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Received: 25 December 2023
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Corresponding Authors:
赵 琳（1977—），男，博士，正高级工程师，主要研究方向为焊接、激光加工和增材制造。
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2024, Vol. 34 
