Effect of V doping on the phase structure of FeCrNiMnVx
This study utilized the CALPHAD method to establish a thermodynamic calculation model for high-entropy alloy FeCrNiMnVx(x=0.0～1.0)and conducted in-depth discussions and analysis on the phase composition and strength of FeCrNiMnVx with V doping.The research findings revealed that when x=0.0,FeCrNiMn is primarily composed of face-centered cubic structure(FCC-A1)and SIGMA phase at room temperature.Within the temperature range of 800～890 K,the system undergoes a transition from or-dered to disordered phase,shifting from SIGMA phase to a state containing body-centered cubic(BCC-A2)and face-centered cubic(FCC-A1)phases.As x increases to 0.2,the FeCrNiMnVx system at room tempera-ture is mainly composed of SIGMA and FCC#2 phases,and experiences a phase transition from FCC#2+SIGMA to FCC-A1 in the temperature range of 390～435 K.Compared to this,the phase structure of Fe-CrNiMnV0.4 is similar to FeCrNiMnV0.6,while FeCrNiMnV0.8 exhibits three phases at 300 K:SIGMA#2,SIGMA,and FCC#2.When V element is increased to 1.0,FeCrNiMnVx at room temperature consists of four phases,namely BCC-A2,SIGMA,CR3MN5,and FCC#2,with phase transitions of SIGMA+CR3MN5 to BCC-A2 and FCC#2+CR3MN5 to FCC-A1 in the temperature range of 390～400 K.The addition of V element significantly enhances the tensile strength and yield strength of FeCrNiMnVx,primarily due to the increase in BCC phase composition and grain refinement.
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