Additive friction stir deposition: a deformation processing route to metal additive manufacturing

As the forging counterpart of fusion-based additive processes, additive friction stir deposition offers a solid-state deformation processing route to metal additive manufacturing, in which every voxel of the feed material undergoes severe plastic deformation at elevated temperatures. In this perspective article, we outline its key advantages, e.g. rendering fully-dense material in the as-printed state with fine, equiaxed microstructures, identify its niche engineering uses, and point out future research needs in process physics and materials innovation. We argue that additive friction stir deposition will evolve into a major additive manufacturing solution for industries that require high load-bearing capacity with minimal post-processing.

Automated summary

Additive friction stir deposition, as a counterpart to fusion-based additive processes, offers a solid-state deformation processing route for metal additive manufacturing. Its key advantages include producing fully-dense material in the printed state with fine, equiaxed microstructures, making it suitable for industries requiring high load-bearing capacity with minimal post-processing.