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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract: Diamond-reinforced metal matrix composites (DMMC) have great potential for wear-resistance 11 applications due to the superior hardness of the diamond component. Cold spray as an emerging coating technique is 12 able to fabricate coatings or bulk materials without exceeding the material melting point, thereby significantly 13 lowering the risk of oxidation, phase transformation, and excessive thermal residual stress. In this paper, thick DMMC 14 coatings were deposited onto aluminum alloy substrate via cold spray of three feedstock powders: copper-clad 15 diamond and pure copper, and their mixtures. It was found that, due to its low processing temperature, cold spray is 16 able to prevent graphitization of the diamond in the DMMC coatings. Further to that, the original diamond phase was 17 almost completely retained in the DMMC coatings. In case of the coatings fabricated from copper-clad diamond 18 powders only, its mass fraction reached 43 wt.%, i.e. value higher than in any previous studies using conventional 19 pre-mixed powders. Furthermore, it was found that the added copper content powders acted as a buffer, effectively 20 preventing the fracture of the diamond particles in the coating. Finally, the wear test on the coatings showed that the 21 cold sprayed DMMC coatings had excellent wear-resistance properties due to the diamond reinforcement. 22

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