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| Abstract No.: |
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Scheduled at:
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Friday, June 09, 2017, Hall 26 2:20 PM
Amorphous Coatings
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| Title: |
Microstructural studies of Fe-based metallic glass coatings by cold gas spray process
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| Authors: |
Arslan Khalid* / University of New South Wales, Australia
Paul Munroe / University of New South Wales , Australia
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| Abstract: |
Cold Spray (CS) is a solid-state low temperature coating spray technology in the family of thermal spray coatings based on the phenomenon of high-velocity particle/substrate impact. In this work, Fe-based metallic glass particles were projected by CS onto a mild steel substrate. The CS operational parameters such as; gas temperature, raster speed and powder feed rate, were varied during the deposition process. Our findings revealed that a denser coating is formed by increasing the raster speed and decreasing the powder feed rate. Detailed microstructural investigation of the splat-substrate interfaces and substrate impact craters were carried out by using scanning electron microscopy (SEM), focused ion beam (FIB) microscopy and transmission electron microscopy (TEM). The results showed that the bond between substrate and the cold-sprayed splats is reliant on intensive plastic deformation of the substrate by the particles during impact. This bonding can be attributed to mechanical interlocking between the substrate and coating material with no evidence of chemical and metallurgical bonding. Energy dispersive spectroscopy (EDS) mapping of selected splats further demonstrate the existence of no chemical interaction between substrate and coating, which confirms the absence of any localized melting and/or any intermediate compound.
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