Cold Spray (CS) is a deposition process, part of the thermal spray family. In this method, powder particles are accelerated at supersonic speed within a nozzle; impacts against a substrate material triggers a complex process, ultimately leading to consolidation and bonding. CS, in its modern form, has been around for approximately 30 years and has undergone through exciting and unprecedented developmental steps. In this article, we have summarized the key inventions and sub-inventions which pioneered the innovation aspect to the process that is known today, and the key breakthroughs related to the processing of materials CS is currently mastering. CS has not followed a liner path since its invention, but an evolution more similar to a hype cycle: high initial growth of expectations, followed by a decrease in interest and a renewed thrust pushed by a number of demonstrated industrial applications. The process interest is expected to continue (gently) to grow, alongside with further development of equipment and feedstock materials specific for CS processing. A number of current applications have been identified the areas that the process is likely to be the most disruptive in the medium-long term future have been laid down.

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Cold Spray (CS) has gained special interest as a coating method due to the production of low oxide content deposits and solid-state deposition of powder material. This paper investigates the interaction between an electromagnetic field and cold-sprayed coatings produced using an induction heating cold spray (IHCS) system. It also investigates the role of the initial substrate surface temperature. The soft/hard material combination was used for depositing pure aluminum on Ti64 substrates. To assess the performance of the IHCS technique, deposition efficiency and adhesion and tensile strengths were used to characterize the hybrid technique. The results were compared to the traditional CS process. It was observed that the IHCS tensile samples exhibited almost three times the average elongation at break obtained by the traditional CS process. Intra-particle surface fracture was found in the samples produced by the hybrid process.