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Multipass friction stir processing of Fe based metallic glass ribbons interspersed between Cu plates was performed. From the first pass, the process entailed on the one hand the decrease of the Cu mean grain size in the nugget by a factor of about 5 and on the other hand the fracture, the refinement and the partial crystallization of the amorphous reinforcement. Cu diffusion also led to marked Cu enrichments in the Fe based metallic glass whose mean Cu content reached 2.7 at%. Beside the metallic glass based reinforcements, some nanometric polycrystalline copper oxides were formed and dispersed within the nugget. The nugget also experienced dynamic recovery and dynamic recrystallization which was in particular favored by the accumulation of dislocations around the reinforcements. Finally, the greater number of passes, the harder the nugget becomes.

Cold spraying (CS), or cold gas dynamic spray (CGDS), is an emerging solid-state powder deposition process, allowing fast and mass production and restoration of metallic components. CS of metal matrix composites (MMCs) has attracted increasing attention from academia and industry over the last decades, especially in the area of Al matrix composites (AMCs), which have demonstrated a high potential for applications in aerospace, automotive, and electronics industries. This article aims to summarize the recent development of CS-processed AMCs in terms of composite powder preparation, deposition processing, microstructure evolution, mechanical and corrosion properties. Furthermore, this review also reports the relevant research progress with the focus on post-treatments of the AMCs for CS additive manufacturing applications including heat treatment, hot rolling, and friction stir processing. Finally, the challenges and perspectives on the fabrication of advanced AMCs by CS are addressed.