A facile synthesis of Inconel718-GNSs composites with high strength via spark plasma sintering

Innovations in the production process and second phase strengthening are commonly used to improve mechanical performances of nickel-based superalloys. Herein, a facile strategy for preparing graphene nanosheets-Inconel718 (IN718-GNSs) composites by three-dimensional (3D) rock-milling and spark plasma sintering (SPS) at 1100 celcius was investigated. It is found that the fabricated IN718-0.3GNSs composites have remarkable mechanical properties. The microhardness and compressive yield strength of the IN718-0.3GNSs composite were 13.0% and 9.54% respectively higher than the cast Inconel718 alloy. Furthermore, the results showed that high temperature creep dominated the densification mechanism of SPS based on densification kinetics and a high relative density. The results also demonstrated that the strengthening mechanism of IN718-GNSs composites was mainly attributed to dislocation strengthening, grain refinement, and load transfer, in which load transfer dominates. It anticipates that this strategy can open an opportunity to induce graphene with high structural integrity by simple and economical pre-paration and promote the development of graphene reinforced other metal matrix composites and beyond.(c) 2022 Elsevier B.V. All rights reserved.