Enhancement of mechanical properties and corrosion resistance of ultra-fine grain Al0.4FeCrCo1.5NiTi0.3 high-entropy alloy by MA and SPS technologies

Abstract

Al0.4FeCrCo1.5NiTi0.3 high-entropy alloy (HEA) was prepared by mechanical alloying (MA) and spark plasma sintering (SPS), which were evaluated in this study by XRD and TEM. After SPS, the bulk alloy exhibited a structure with a dominant fcc phase, a minor volume fraction of bcc phase, and the formation of TiAl3 intermetallic compound. Deformation twinning was observed in the fcc phase in the bulk HEA. The latter had a compressive strength, strain and Vickers hardness of 2225 ± 15 MPa, 17.52 ± 0.50 % and 515 ± 16 HV, respectively. The corrosion resistance studies indicated that Al0.4FeCrCo1.5NiTi0.3 with ultra-fine grained micro-structure was easier to passivate and possessed excellent corrosion resistance.