Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (3): 391-404.DOI: 10.1007/s40195-022-01473-9

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Effects of V Addition on Microstructural Evolution and Mechanical Properties of AlCrFe2Ni2 High-Entropy Alloys

Shougang Duan1, Qian Zhang1, Wenxuan Li1, Yong Dong1(), Beibei Jiang2, Shichao Liu3(), Chuanqiang Li1, Zhengrong Zhang1   

  1. 1School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
    2GDUT Analysis and Test Center, Guangdong University of Technology, Guangzhou 510006, China
    3School of Tron and Steel, Soochow University, Suzhou 215021, China

Abstract:

The effects of vanadium addition on the microstructural evolution and mechanical properties of AlCrFe2Ni2 high-entropy alloy (HEA) were investigated. The results showed that the AlCrFe2Ni2V0.2 HEA was composed of FCC phase, disordered BCC phase, and ordered BCC (B2) phase. With the increase in vanadium content, the formation of FCC phase was inhibited, and a transition from FCC phase to BCC phase occurred. The FCC phase disappeared completely when the value of x exceeds 0.4 in AlCrFe2Ni2Vx HEAs. Besides, the amplitude-modulated microstructure morphology transformed from a B2 phase matrix with dispersed BCC nano-phase into an alternating interconnected B2 and BCC phases. Vanadium element has the function of stabilizing BCC phase and B2 phase in AlCrFe2Ni2Vx alloys. The hardness of AlCrFe2Ni2Vx alloys increased from HV 332.4 to HV 590.7, while the yield strength increased from 765 to 1744.6 MPa with increasing vanadium content, which was mainly due to the decreasing content of FCC phase and the solid solution strengthening of vanadium element. At the same time, the compression ratio of the alloys decreased with the disappearance of the FCC phase. Among the alloys, the AlCrFe2Ni2V0.2 alloy possessed the most excellent comprehensive mechanical properties with yield strength, fracture strength, and compressive ratio 1231.1, 2861.9 MPa, and 44.5%, respectively.

Key words: High-entropy alloys, Microstructure, Phase transformation, Mechanical properties, Solid solution strengthening