A special section presents the current state of research in the field of ultrafine grained metallic materials and composites, with emphasis on processes, properties and microstructures.

A Nacre-mimicking composite material of graphene and copper was developed by a unique processing approach which is simple, scalable, and can be applied to an array of 2D material systems to achieve bio-inspired microstructures.

In a synergistic effort to combine HEA design with martensite design, multifunctional non-equiatomic high entropy alloys have been fabricated with superelastic, high damping, and excellent cryogenic properties, within a single composition.