Effect of Al Content on Microstructure and Mechanical Properties of FeNiCoCrVAl High-Entropy Alloys
The phase structure,microstructure and mechanical properties of Fe46-xNi20Co20Cr10V4Alx(x=5,8,12,15)high-entropy alloys with different Al contents(atom fraction,％)were systematically investigated by using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)and performing uniaxial tensile test.The results show that with the increase of Al content,the phase structure of Fe46-xNi20Co20Cr10V4Alx high-entropy alloys transforms from single-phase structure of face-centered cubic(FCC)to dual-phase structure of FCC and body-centered cubic(BCC).Also,the strength increases and ductility decreases.The Fe34Ni20Co20Cr10V4Al12 high-entropy alloy annealed at 900 ℃ exhibits an excellent strength-ductility balance,with yield strength,tensile strength and elongation to failure at 593 MPa,1009 MPa and 32.13％,respectively.With Al content of 5％,the as-cast and annealed high-entropy alloys remain single FCC phase.However,with Al content of 8％,12％and 15％,the high-entropy alloys all become FCC-BCC phase.The annealing treatment promotes the precipitation of BCC phase,and the proportion of BCC phase increases with increasing annealing temperature.
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