Microstructure and strengthening effects of novel Co-Cr-Fe-Ni-Re multicomponent alloys

摘要

Novel Co-53.5 xNixCr20Fe10Re16.5 (x = 18.5, 23.5, 28.5 and 33.5 at.%) multicomponent alloys (MCAs) with high temperature application potential are presented. The phase transformation, refined microstructure and tensile properties were investigated for these MCAs under solutionized and annealed states. The solutionized MCAs with Ni content less than 28.5% consist of FCC, HCP laminate layers and nodular sigma phase with Cr2Re3 type of tetragonal structure. As for annealed MCAs, HCP laminates disappeared while thin laminate r phases emerged by discontinuous precipitation reaction. It is the structural delamination that results in great strengthening while having not so much detrimental effect on deformation ability. (C) 2021 Elsevier B.V. All rights reserved.