Architected superalloys: a pathway to lightweight high temperature materials

Journal article

Materials for high temperature applications – for example rocket engines – are often metallic and therefore tend to suffer from high density when used in their monolithic form. The root cause of this dilemma is the solid-state physics causing the low rates of thermally-activated processes such as diffusion and creep, it also confers the very high density. Using the nickel-based superalloys as an exemplar, we demonstrate here that this dilemma in high temperature materials can be defeated by designing open cellular structures – leveraging recent progress in new alloys designed specifically for additive manufacturing. The resulting low-density architected materials exhibit optimal stretch-dominant or bend-dominant behaviour at high temperatures, as exemplified by regular honeycomb structures which are built. Thus, as well-behaved materials these findings open up new design possibilities for high-temperature applications where low density is particularly needed.

Authors: Tang, YT; Zhang, Y; Wan, L; Kuek, N; Alabort, E

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Scripta Materialia
• Volume: 260
• Article number: 116598
• Publication date: 2025-02-10
• Acceptance date: 2025-02-04
• DOI: 10.1016/j.scriptamat.2025.116598
• ISSN: 1359-6462
• Language: English
• Keywords: superalloy; lattice; honeycomb; architected material; high temperature; deformation