Microstructures and mechanical properties of CrFeNi2Nbx eutectic multicomponent alloys

The effects of Nb content on microstructures and resultant mechanical properties in Co-free CrFeNi2Nbx (x = 0, 0.2, 0.4, 0.55, 0.6, and 0.8) eutectic multicomponent alloys were investigated at room temperature. With increasing Nb content, the initial microstructure of a single face-centered cubic phase varied from hypoeutectic (0.2 < 0.6) to hypereutectic (x > 0.6) with the formation of Fe2Nb-type Laves phase, and the compressive strength and hardness increased at the expense of ductility reduction. Although the overall mechanical properties of the alloys were inferior to those of Co-containing CoCrFeNiNbx alloys, a comparable maximum fracture strength (2060.6 MPa) was achieved in the CrFeNi2Nb0.6 alloy, which showed an ultrafine full eutectic lamellar structure. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The effects of Nb content on microstructures and mechanical properties in Co-free CrFeNi2Nbx alloys were investigated. Increasing Nb content led to changes in microstructures and improved mechanical properties, with a reduction in ductility. The CrFeNi2Nb0.6 alloy achieved a high maximum fracture strength.