Microstructure and mechanical properties of FeCrNi(AlTi)x duplex medium-entropy alloys
FeCrNi(AlTi)x(x=0,0.2,0.34 and 0.49)duplex medium-entropy alloys were prepared by vacuum suspension induction melting method.The effects of Al and Ti content changes and homogenization heat treatment on microstructure and mechanical properties of the alloys were studied.The results show that with the increase of Al and Ti content,the phase structure of the alloys changes from a single-phase FCC structure to a duplex FCC and BCC structure.Moreover,with the increase of Al and Ti content,the volume fraction of BCC phase significantly increases,and the compressive yield strength and hardness of the alloys significantly increase.After homogenization heat treatment,the yield strength and ultimate tensile strength of the FeCrNi(AlTi)0 2 alloy reach 519 MPa and 852 MPa,respectively,and the elongation is 17.2％.Homogenization heat treatment enables the segregation of some elements in the as cast alloy to be uniformly distributed in the matrix,thereby achieving synchronous improvement of the alloy's strength and plasticity.
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