Overcoming high-temperature strength-ductility trade-off by combination deformation twinning of C11b and D022 superlattices in a Ni-Cr-W/Mo-based superalloy. (November 2022)

• Record Type: Journal Article
• Authors: Li, Xiaolin; He, Yi; Liu, Linxi; Gao, Xiangyu; Hua, Ke; Wang, Haifeng
• Is Part Of: Scripta materialia. Number 220(2022)
• Publication Date: 2022-11
• Subjects: Ni-based superalloys -- C11b superlattice -- D022 superlattice -- High-temperature deformation twinning -- Partial dislocation slip; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114931
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A Ni-7.9Cr-5.9W-22.2Mo-1.4Ti (wt.%) superalloy was designed and prepared to have simultaneously high densities of nanoscale C11b and D022 superlattices within the disordered Ni-based austenite matrix. As a result, both strength and ductility were enhanced significantly at the elevated temperature as compared to the Ni-8Cr-6W-22.5Mo superalloy with only the nanoscale C11b superlattice. This is ascribed to not only co-existent precipitation strengthening of nanoscale C11b and D022 superlattices but also their combination deformation twinning induced strength and plasticity. Such a novel mechanism to overcome high-temperature strength-ductility trade-off would shed some light on designing advanced Ni-based superalloys. Graphical abstract: Image, graphical abstract