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Microstructures of Cold Sprayed Deposits

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Cold Spray Additive Manufacturing

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Abstract

The microstructure of cold sprayed deposits directly determines the properties of CSAM products and thus it is of importance to well understand the microstructural evolution mechanism of cold sprayed deposits. The microstructure is largely dependent on the plastic deformation behaviour of cold spray feedstock particles during their deposition. As the plastic deformation of cold spray particles is not homogenous with severe plastic deformation occurring at the contact interfaces, cold sprayed deposits typically have heterogenous microstructure and grain structures. A large number of dislocations and newly formed grains are only localized in the shear zones at the interparticle interfaces, while the microstructure in the interior region is mainly characterized by coarse grains. This chapter thoroughly discusses the formation mechanism of dislocations and ultra fine grains (UFGs) in various cold sprayed deposits during cold spray deposition. The formation mechanisms of intermetallic compounds and amorphous phases are also interpreted and discussed.

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  1. Department of Mechanical, Manufacturing and Biomedical Engineering, School of Engineering, Trinity College Dublin, The University of Dublin, Dublin, Ireland

    Shuo Yin

  2. Department of Mechanical, Manufacturing and Biomedical Engineering, School of Engineering, Trinity College Dublin, The University of Dublin, Dublin, Ireland

    Rocco Lupoi

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Yin, S., Lupoi, R. (2021). Microstructures of Cold Sprayed Deposits. In: Cold Spray Additive Manufacturing. Springer Tracts in Additive Manufacturing. Springer, Cham. https://doi.org/10.1007/978-3-030-73367-4_4

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