High‐Temperature Multilayer Composites with Superplastic Interlayers

Abstract

A high‐temperature multilayer composite (MLC) with hot hard layers and superplastic layers was proposed in this communication. The hard layer can provide the MLC high‐temperature strength; the superplastic layer can deform plastically at high temperatures, disperse the applied stress, and stop the crack from advancing. Such an MLC was prepared via tape casting in the Al 2 O 3 /MoSi 2 +Mo 2 B 5 system in the present work; in this system, Al 2 O 3 was the hard layer and MoSi 2 +Mo 2 B 5 was the superplastic layer. The microstructures and the stress‐displacement behaviors of the MLCs were investigated. Finally, the design rules for the high‐temperature MLCs were discussed briefly.