Enhanced strength-ductility synergy in a novel V-containing γ″-strengthened CoCrNi-based multi-component alloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-06, Vol.816, p.141289, Article 141289
• Main Authors: Pan, Yunwei, Dong, Anping, Zhou, Yang, Du, Dafan, Wang, Donghong, Zhu, Guoliang, Sun, Baode
• Format: Article
• Language: English
• Subjects: Alloys; CALPHAD; D022 superlattice; Ductility; Elongation; Mechanical properties; Multi-component alloys; Precipitates; Precipitation strengthening; Synchrotron X-ray diffraction; Synchrotrons
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2021.141289

γ″ precipitates have been introduced into V-containing CoCrNi-based alloy, showing superior strength-ductility synergy (product of ultimate-tensile-strength and elongation ~51.8 GPa·%, yield-strength ~890.6 MPa) than reported γ″-strengthened and CoCrNi-based alloys. Synchrotron XRD was first-time used to identify the existence of γ″ phase in V-containing CoCrNi-based alloys, where moderate γ″/γ lattice misfit results in good combination of coherency-strengthening and coarsening-resistance. [Display omitted] •γ″ phase is successfully introduced in the CoCrNi-based medium entropy alloys.•The precipitation of γ″ causes a significant enhancement in strength.•V-addition overcomes strength-ductility trade-off in γ″-strengthened alloys.•Synchrotron X-ray diffraction is used to identify γ″/γ lattice misfit.